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Centrus Energy Corp
(NYSE MKT:LEU) 

LEU stock logo

Centrus Energy Corp. supplies nuclear fuel and services for the nuclear power industry in the United States, Japan, Belgium, and internationally. The company operates in two segments, Low-Enriched Uranium (LEU) and Technical Solutions. The LEU segment sells separative work units (SWU) component of L...

Founded: 1992
Full Time Employees: 230
CEO: Amir Vexler  
Sector: Energy
Industry: Uranium

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At a glance:
  • Positioned for Growth from U.S. Nuclear Fuel Supply Chain Rebuild: Centrus is leveraged to policy-driven efforts to re-establish domestic uranium enrichment capacity and reduce reliance on Russian supply, which could expand long-term demand for its services.
  • HALEU Commercialization Is a Key Upside (and Execution Risk): Progress on HALEU (high-assay low-enriched uranium) for advanced reactors could become a meaningful revenue driver, but timelines depend on DOE programs, funding continuity, and successful scale-up.
  • Results Can Be Lumpy Due to Contract Mix and Government-Linked Work: Earnings and cash flow may fluctuate quarter-to-quarter based on timing of deliveries, contract renewals, and work performed under government agreements, making near-term visibility uneven.
  • Geopolitical and Regulatory Tailwinds Support Pricing Power: Sanctions, import restrictions, and heightened energy-security priorities can tighten enrichment supply and support stronger contracting conditions, though regulatory and compliance requirements remain stringent.
  • Customer Concentration and Program Dependence Are Notable Risks: A meaningful portion of opportunity is tied to a limited set of utilities and DOE-related initiatives; delays, budget changes, or contract modifications could materially affect growth expectations.
Bull Thesis:
  • HALEU Production Leadership and First-Mover Advantage: Centrus is the only U.S. company licensed to produce High-Assay Low-Enriched Uranium (HALEU), a critical fuel for next-generation advanced nuclear reactors. This provides a significant first-mover advantage and a strong competitive moat in an emerging, high-growth market with substantial government backing.
  • Geopolitical Tailwinds and Energy Security Demand: Global efforts to reduce reliance on Russian uranium supply, coupled with a renewed focus on nuclear energy for decarbonization and energy security, create strong demand for Centrus's U.S.-based enriched uranium products and services. This strategic importance is driving increased government and utility interest.
  • Strong Contract Backlog and Government Support: Centrus has secured significant long-term contracts for both standard LEU and HALEU, including substantial awards from the U.S. Department of Energy (DOE). This provides revenue visibility, reduces financial risk for HALEU scale-up, and validates the company's strategic importance to national energy goals.
  • Improved Financial Health and Profitability: The company has demonstrated improved financial performance, often reporting profitability and a strengthened balance sheet. This financial stability positions Centrus well to fund its growth initiatives, particularly the capital-intensive HALEU production scale-up, and potentially return value to shareholders.
Bear Thesis:
  • Capital Intensity and Execution Risk of HALEU Scale-Up: While HALEU presents a major opportunity, scaling up production at the American Centrifuge Plant is highly capital-intensive and subject to operational, technical, and supply chain execution risks. Delays, cost overruns, or unforeseen technical challenges could impact profitability and cash flow projections.
  • Market Adoption Rate of Advanced Reactors: The long-term demand for HALEU is directly tied to the successful development, licensing, and commercial deployment of advanced nuclear reactors. If these reactors face significant delays in their development timelines, regulatory hurdles, or slower-than-anticipated market adoption, the HALEU market growth could be constrained, impacting Centrus's long-term revenue potential.
  • Regulatory and Licensing Hurdles: Operating in the nuclear industry involves stringent regulatory oversight and complex licensing processes. Any unforeseen regulatory changes, delays in obtaining necessary approvals for expansion or new technologies, or compliance issues could disrupt operations, increase costs, and impact project timelines.
  • Uranium Price Volatility and Competition: While HALEU is a niche, Centrus also participates in the broader enriched uranium market. This market can be subject to volatility in uranium prices and global supply dynamics. Despite current geopolitical tailwinds, long-term price fluctuations or increased competition from other global suppliers could impact margins on its LEU sales.
Main Competitors:
  • URENCO Ltd. (Uranium enrichment services (Low Enriched Uranium - LEU)), A leading global provider of uranium enrichment services, URENCO is a direct and major competitor to Centrus in the supply of LEU for nuclear power plants worldwide. They utilize advanced centrifuge technology and have significant market share, particularly in Europe and North America.
  • Orano (Orano Cycle business unit) (Nuclear fuel cycle services, including uranium enrichment), As a major global player in the nuclear fuel cycle, Orano competes with Centrus in the enrichment of uranium. They offer a comprehensive suite of services from mining to recycling, leveraging their extensive experience and state backing (French government) to secure long-term contracts.
  • TENEX (Techsnabexport, part of Rosatom) (Uranium enrichment products and services), Representing Russia's state nuclear energy corporation, TENEX is a significant global supplier of enriched uranium. They compete with Centrus for market share in the international LEU market, though their market access and competitive position can be influenced by geopolitical considerations and sanctions.
  • China National Nuclear Corporation (CNNC) (Full nuclear fuel cycle services, including uranium enrichment), While primarily focused on China's rapidly expanding domestic nuclear power program, CNNC has developed its own advanced enrichment capabilities. They represent a growing force in the global nuclear industry and a potential future competitor in the international enrichment market as China seeks greater energy independence and global influence.
Moat:
Centrus Energy operates in a highly specialized and capital-intensive industry with significant barriers to entry, forming a strong competitive moat. Its proprietary centrifuge technology, particularly its early lead in High-Assay Low-Enriched Uranium (HALEU) production for advanced reactors, provides a strategic advantage. However, the competitive landscape is an oligopoly dominated by a few large, often state-backed, global players. Competition primarily revolves around long-term supply contracts, pricing, technological efficiency, and geopolitical factors influencing supply chain security. Centrus's ability to innovate and secure early HALEU contracts is crucial for its future growth against these established giants.
Income Statements:
Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-09-30 2002-06-30 2002-03-31 2001-12-31 2001-09-30 
                                                                                                      
      revenue:
                                                                                                      
      separative work units
    41,600,000 111,000,000 10,700,000 125,700,000 51,300,000 48,700,000 34,800,000 139,700,000 23,600,000 60,800,000 40,500,000 48,100,000 58,800,000 90,200,000 7,700,000 85,500,000 12,800,000 60,900,000 19,100,000 45,200,000 38,100,000 62,100,000 100,000 58,600,000 30,700,000 36,300,000 75,000,000  12,400,000 62,400,000 17,600,000 32,900,000 17,700,000 113,200,000 43,500,000 37,900,000 800,000 130,200,000 14,100,000 54,900,000 59,300,000 135,300,000 8,800,000 42,200,000 103,600,000 -246,500,000 97,400,000 104,500,000 145,600,000 369,500,000 295,800,000 267,400,000 290,200,000 377,200,000 559,500,000 347,200,000 537,900,000 394,200,000 297,900,000 330,300,000 308,500,000 519,600,000 404,200,000 331,000,000 266,600,000 380,800,000 467,000,000 371,300,000 427,900,000 314,300,000 490,400,000 125,700,000 245,100,000 536,100,000 483,500,000 145,900,000 405,000,000 362,500,000 336,600,000 404,300,000 234,000,000 371,800,000 306,200,000  214,300,000 129,550,000 194,600,000 196,200,000 127,400,000          
      uranium
    3,000,000 13,400,000 34,100,000   73,200,000  29,900,000  21,300,000  39,500,000  22,000,000 12,500,000  4,900,000 9,900,000 12,900,000   15,600,000 18,600,000 4,800,000  7,600,000 12,800,000 2,600,000 22,700,000 18,900,000 11,300,000  3,600,000        14,300,000 22,300,000   43,200,000     25,900,000 3,800,000 13,900,000 27,600,000 22,400,000  3,600,000  28,700,000 21,300,000 67,800,000 14,000,000 71,600,000 79,300,000 69,600,000 15,600,000 30,500,000 26,200,000 95,400,000 28,600,000 62,600,000 49,200,000 58,100,000 47,200,000 29,300,000 102,200,000 16,200,000 15,800,000 135,500,000 34,400,000 71,000,000 75,800,000 121,600,000 60,200,000  45,800,000 27,950,000 16,800,000 81,000,000 14,000,000 64,900,000 28,000,000 51,700,000 24,500,000 17,000,000 23,000,000 9,100,000 78,800,000 6,000,000 
      technical solutions
    32,100,000 21,800,000 30,100,000 28,800,000 21,800,000 29,700,000 22,900,000 19,400,000 20,100,000 21,500,000 10,800,000 10,800,000 8,100,000 14,000,000 13,000,000 13,600,000 17,600,000 18,200,000 59,300,000 17,200,000 17,500,000 15,200,000 14,900,000 12,300,000 14,300,000                                                                          
      total revenue
    76,700,000 146,200,000 74,900,000 154,500,000 73,100,000 151,600,000 57,700,000 189,000,000 43,700,000 103,600,000 51,300,000 98,400,000 66,900,000 126,200,000 33,200,000 99,100,000 35,300,000 89,000,000 91,300,000 62,400,000 55,600,000 92,900,000 33,600,000 75,700,000 45,000,000 55,700,000 104,700,000 10,600,000 38,700,000 83,800,000 34,100,000 39,400,000 35,700,000 116,900,000 50,300,000 44,000,000 7,200,000 136,500,000 21,400,000 63,400,000 90,000,000 157,900,000 29,200,000 63,300,000 167,800,000 -266,900,000 120,700,000 121,200,000 148,600,000 398,500,000 303,800,000 284,800,000 320,400,000 421,300,000 570,500,000 364,800,000 561,500,000 462,400,000 374,500,000 454,400,000 380,500,000 666,400,000 564,600,000 459,700,000 344,700,000 467,600,000 549,300,000 514,300,000 505,600,000 431,900,000 590,400,000 249,000,000 343,300,000 617,200,000 634,700,000 211,100,000 465,000,000 544,200,000 417,800,000 525,300,000 361,300,000 549,700,000 421,000,000  311,200,000 187,700,000 252,200,000 318,600,000 180,000,000          
      yoy
    4.92% -3.56% 29.81% -18.25% 67.28% 46.33% 12.48% 92.07% -34.68% -17.91% 54.52% -0.71% 89.52% 41.80% -63.64% 58.81% -36.51% -4.20% 171.73% -17.57% 23.56% 66.79% -67.91% 614.15% 16.28% -33.53% 207.04% -73.10% 8.40% -28.31% -32.21% -10.45% 395.83% -14.36% 135.05% -30.60% -92.00% -13.55% -26.71% 0.16% -46.36% -159.16% -75.81% -47.77% 12.92% -166.98% -60.27% -57.44% -53.62% -5.41% -46.75% -21.93% -42.94% -8.89% 52.34% -19.72% 47.57% -30.61% -33.67% -1.15% 10.39% 42.51% 2.79% -10.62% -31.82% 8.27% -6.96% 106.55% 47.28% -30.02% -6.98% 17.95% -26.17% 13.41% 51.91% -59.81% 28.70% -1.00% -0.76%  16.10% 192.86% 66.93%  72.89%              
      qoq
    -47.54% 95.19% -51.52% 111.35% -51.78% 162.74% -69.47% 332.49% -57.82% 101.95% -47.87% 47.09% -46.99% 280.12% -66.50% 180.74% -60.34% -2.52% 46.31% 12.23% -40.15% 176.49% -55.61% 68.22% -19.21% -46.80% 887.74% -72.61% -53.82% 145.75% -13.45% 10.36% -69.46% 132.41% 14.32% 511.11% -94.73% 537.85% -66.25% -29.56% -43.00% 440.75% -53.87% -62.28% -162.87% -321.13% -0.41% -18.44% -62.71% 31.17% 6.67% -11.11% -23.95% -26.15% 56.39% -35.03% 21.43% 23.47% -17.58% 19.42% -42.90% 18.03% 22.82% 33.36% -26.28% -14.87% 6.81% 1.72% 17.06% -26.85% 137.11% -27.47% -44.38% -2.76% 200.66% -54.60% -14.55% 30.25% -20.46% 45.39% -34.27% 30.57%   65.80% -25.57% -20.84% 77.00%           
      cost of sales:
                                                                                                      
      separative work units and uranium
    16,700,000 87,000,000 52,600,000 75,000,000 20,100,000 66,700,000 29,600,000 136,600,000 23,100,000 37,800,000 30,400,000 60,800,000 34,900,000 45,200,000 18,900,000 26,100,000 14,800,000 37,000,000 23,700,000 27,000,000 25,400,000 40,900,000 19,600,000 18,900,000 13,300,000 18,200,000 54,400,000 7,700,000 38,300,000 89,100,000 20,900,000 42,900,000 34,800,000 59,300,000 32,400,000 42,100,000 2,300,000 103,600,000 15,900,000 49,300,000 65,500,000 75,200,000 33,800,000 36,700,000 139,600,000 -249,800,000 103,300,000 100,800,000 165,300,000 426,400,000 330,400,000 328,200,000 303,800,000 354,100,000 522,800,000 340,400,000 501,200,000 416,800,000 298,500,000 368,600,000 307,200,000 546,000,000 451,400,000 358,600,000 267,200,000 372,200,000 461,300,000 391,900,000 414,900,000 308,000,000 498,000,000 135,500,000 260,700,000 497,300,000 480,300,000 142,800,000 353,200,000 392,300,000 326,700,000 404,500,000 225,700,000 400,500,000 337,600,000  218,900,000 133,325,000 180,100,000 225,900,000 127,300,000          
      total cost of sales
    45,200,000 111,200,000 79,200,000 100,600,000 40,200,000 89,800,000 48,800,000 152,500,000 39,400,000 53,800,000 40,000,000 70,400,000 43,900,000 77,800,000 30,900,000 38,200,000 29,000,000 52,800,000 41,800,000 45,300,000 43,900,000 57,900,000 34,400,000 31,900,000 25,400,000 48,900,000 69,200,000 14,900,000 44,200,000 93,500,000 26,300,000 50,100,000 41,300,000 64,900,000 38,700,000 48,300,000 9,700,000 110,600,000 23,500,000 57,900,000 74,200,000 75,800,000 53,600,000 59,000,000 160,900,000 -271,200,000 126,100,000 117,700,000 169,500,000 429,800,000 333,800,000 331,700,000 307,100,000 371,900,000 533,000,000 352,500,000 522,700,000 452,200,000 347,600,000 421,200,000 366,600,000 616,800,000 526,600,000 415,600,000 318,000,000 421,700,000 510,100,000 436,900,000 463,400,000 353,800,000 542,000,000 185,500,000 304,500,000 542,600,000 522,700,000 183,400,000 391,800,000 431,000,000 365,700,000 445,700,000 269,300,000 446,600,000 384,500,000  263,500,000 161,050,000 216,600,000 263,200,000 164,400,000          
      gross profit
    31,500,000 35,000,000 -4,300,000 53,900,000 32,900,000 61,800,000 8,900,000 36,500,000 4,300,000 49,800,000 11,300,000 28,000,000 23,000,000 48,400,000 2,300,000 60,900,000 6,300,000 36,200,000 49,500,000 17,100,000 11,700,000 35,000,000 -800,000 43,800,000 19,600,000 6,800,000 35,500,000   -9,700,000 7,800,000   52,000,000 11,600,000 -4,300,000 -2,500,000 25,900,000 -2,100,000 5,500,000 15,800,000   4,300,000 6,900,000 4,300,000 -5,400,000 3,500,000 -20,900,000 -31,300,000 -30,000,000 -46,900,000 13,300,000 49,400,000 37,500,000 12,300,000 38,800,000 10,200,000 26,900,000 33,200,000 13,900,000 49,600,000 38,000,000 44,100,000 26,700,000 45,900,000 39,200,000 77,400,000 42,200,000 78,100,000 48,400,000 63,500,000 38,800,000 74,600,000 112,000,000 27,700,000 73,200,000 113,200,000 52,100,000 79,600,000 92,000,000 103,100,000 36,500,000  47,700,000 42,800,000 35,600,000 55,400,000 15,600,000 59,900,000 29,900,000 40,700,000 34,600,000 24,600,000 30,700,000 20,400,000 40,700,000 13,200,000 
      yoy
    -4.26% -43.37% -148.31% 47.67% 665.12% 24.10% -21.24% 30.36% -81.30% 2.89% 391.30% -54.02% 265.08% 33.70% -95.35% 256.14% -46.15% 3.43% -6287.50% -60.96% -40.31% 414.71% -102.25%   -170.10% 355.13%   -118.65% -32.76%   100.77% -652.38% -178.18% -115.82%   27.91% 128.99%   22.86% -133.01% -113.74% -82.00% -107.46% -257.14% -163.36% -180.00% -481.30% -65.72% 384.31% 39.41% -62.95% 179.14% -79.44% -29.21% -24.72% -47.94% 8.06% -3.06% -43.02% -36.73% -41.23% -19.01% 21.89% 8.76% 4.69% -56.79% 129.24% -46.99% -34.10% 114.97% -65.20% -20.43% 9.80% 42.74%  92.87% 140.89% 2.53%  205.77% -28.55% 19.06% 36.12% -54.91% 143.50% -2.61% 99.51% -14.99% 86.36%     
      qoq
    -10.00% -913.95% -107.98% 63.83% -46.76% 594.38% -75.62% 748.84% -91.37% 340.71% -59.64% 21.74% -52.48% 2004.35% -96.22% 866.67% -82.60% -26.87% 189.47% 46.15% -66.57% -4475.00% -101.83% 123.47% 188.24% -80.85%    -224.36%    348.28% -369.77% 72.00% -109.65% -1333.33% -138.18% -65.19%    -37.68% 60.47% -179.63% -254.29% -116.75% -33.23% 4.33% -36.03% -452.63% -73.08% 31.73% 204.88% -68.30% 280.39% -62.08% -18.98% 138.85% -71.98% 30.53% -13.83% 65.17% -41.83% 17.09% -49.35% 83.41% -45.97% 61.36% -23.78% 63.66% -47.99% -33.39% 304.33% -62.16% -35.34% 117.27% -34.55% -13.48% -10.77% 182.47%   11.45% 20.22% -35.74% 255.13% -73.96% 100.33% -26.54% 17.63% 40.65% -19.87% 50.49% -49.88% 208.33%  
      gross margin %
    41.07% 23.94% -5.74% 34.89% 45.01% 40.77% 15.42% 19.31% 9.84% 48.07% 22.03% 28.46% 34.38% 38.35% 6.93% 61.45% 17.85% 40.67% 54.22% 27.40% 21.04% 37.67% -2.38% 57.86% 43.56% 12.21% 33.91% 0% 0% -11.58% 22.87% 0% 0% 44.48% 23.06% -9.77% -34.72% 18.97% -9.81% 8.68% 17.56% 0% 0% 6.79% 4.11% -1.61% -4.47% 2.89% -14.06% -7.85% -9.87% -16.47% 4.15% 11.73% 6.57% 3.37% 6.91% 2.21% 7.18% 7.31% 3.65% 7.44% 6.73% 9.59% 7.75% 9.82% 7.14% 15.05% 8.35% 18.08% 8.20% 25.50% 11.30% 12.09% 17.65% 13.12% 15.74% 20.80% 12.47% 15.15% 25.46% 18.76% 8.67% NaN% 15.33% 22.80% 14.12% 17.39% 8.67% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% 
      advanced technology costs
    18,900,000 8,900,000 1,700,000 3,300,000 3,000,000 3,300,000 4,100,000 4,100,000 5,700,000 3,400,000 3,300,000 4,100,000 3,400,000 4,800,000 5,400,000 3,500,000 1,100,000 800,000 600,000 200,000 500,000 1,000,000 200,000 700,000 900,000 1,600,000 1,300,000 5,100,000          9,650,000 21,900,000 4,700,000 12,000,000 25,300,000 1,900,000 4,000,000 1,800,000 -51,900,000 5,300,000 18,000,000 33,300,000 36,100,000 44,500,000 46,200,000 59,300,000 1,146,400,000 45,100,000 85,700,000 36,800,000 187,000,000 26,000,000 33,500,000 26,700,000 29,900,000 28,600,000 26,000,000 25,700,000 24,600,000 31,700,000 30,700,000 31,400,000 29,000,000 29,100,000 28,200,000 23,900,000 27,200,000 30,800,000 35,600,000 33,700,000 34,500,000 23,900,000 27,300,000 19,800,000 27,400,000 20,500,000                
      selling, general and administrative
    10,000,000 10,300,000 8,900,000 9,200,000 8,300,000 10,500,000 10,000,000 7,600,000 8,100,000 8,200,000 9,300,000 7,800,000 10,300,000 9,500,000 8,600,000 8,300,000 7,500,000 11,000,000 9,000,000 7,800,000 8,200,000 10,400,000 6,700,000 10,400,000 8,500,000 9,200,000 8,700,000 7,700,000 8,100,000 10,200,000 8,800,000 9,700,000 11,200,000 10,000,000 11,000,000 9,700,000 12,400,000 11,600,000 10,700,000 12,500,000 11,400,000 10,500,000 13,500,000 6,300,000 12,300,000 -22,000,000 10,400,000 10,100,000 11,700,000 10,800,000 11,200,000 11,900,000 12,900,000 13,600,000 12,800,000 14,800,000 14,900,000 14,300,000 15,600,000 16,700,000 15,500,000 15,500,000 14,000,000 14,300,000 15,100,000 13,700,000 14,000,000 16,600,000 14,500,000 13,600,000 12,400,000 16,300,000 12,000,000 12,300,000 9,000,000 11,500,000 12,500,000 12,100,000 10,900,000 14,100,000 11,700,000 20,400,000 12,300,000  15,200,000 11,800,000 15,300,000 15,900,000 16,000,000 27,900,000 12,300,000 14,800,000 14,400,000 11,700,000 14,800,000 11,700,000 13,000,000 11,200,000 
      amortization of intangible assets
    1,800,000 2,500,000 1,100,000 3,700,000 1,100,000 2,600,000 2,400,000 3,700,000 1,100,000 2,100,000 1,400,000 1,700,000 1,100,000 2,800,000 1,100,000 4,000,000 1,100,000 2,700,000 1,700,000 1,600,000 2,100,000 2,500,000 1,200,000 1,700,000 1,400,000 2,400,000 1,800,000 1,200,000 1,100,000 2,100,000 1,700,000 1,500,000 1,300,000 4,900,000 2,500,000 2,000,000 1,200,000 4,900,000 1,700,000 2,700,000 3,200,000 6,300,000 1,100,000 2,000,000 4,000,000                                                      
      operating income
    800,000 12,800,000 -16,600,000 33,500,000 20,500,000 45,100,000 -7,600,000 21,100,000 -10,600,000 32,600,000 -2,900,000 14,400,000 8,300,000 31,300,000 -12,800,000 44,600,000 -3,400,000 21,700,000 38,200,000 7,500,000 900,000 20,600,000 -9,500,000 31,000,000 8,900,000 -6,700,000 23,100,000 -15,300,000 -20,800,000 -29,600,000 -9,100,000 -27,400,000 -26,300,000 36,300,000 -8,200,000 -22,000,000 -23,600,000 100,000 -36,700,000 -14,600,000 -10,500,000         -33,750,000 -53,300,000   -1,064,300,000 12,700,000   -191,100,000 -14,700,000 -17,000,000  16,200,000 7,800,000 14,100,000  76,700,000 -9,000,000 30,100,000 -3,700,000 35,500,000 6,900,000 19,000,000 2,900,000 35,100,000 72,200,000 -19,400,000 27,000,000 64,100,000 17,400,000 38,200,000 59,000,000 53,500,000 -800,000  9,800,000 66,200,000 3,900,000 28,900,000 -9,800,000 18,400,000 7,000,000 14,900,000 10,600,000 6,900,000 11,400,000 13,000,000 24,500,000 -500,000 
      yoy
    -96.10% -71.62% 118.42% 58.77% -293.40% 38.34% 162.07% 46.53% -227.71% 4.15% -77.34% -67.71% -344.12% 44.24% -133.51% 494.67% -477.78% 5.34% -502.11% -75.81% -89.89% -407.46% -141.13% -302.61% -142.79% -77.36% -353.85% -44.16% -20.91% -181.54% 10.98% 24.55% 11.44% 36200.00% -77.66% 50.68% 124.76%             -96.83% -519.69%   456.93% -186.39%   -1279.63% -288.46% -220.57%  -78.88% -186.67% -53.16%  116.06% -230.43% 58.42% -227.59% 1.14% -90.44% -197.94% -89.26% -45.24% 314.94% -150.79% -54.24% 19.81% -2275.00%  502.04% -19.18% -120.51%  -200.00% 259.78% -44.29% 93.96% -192.45% 166.67% -38.60% 14.62% -56.73% -1480.00%     
      qoq
    -93.75% -177.11% -149.55% 63.41% -54.55% -693.42% -136.02% -299.06% -132.52% -1224.14% -120.14% 73.49% -73.48% -344.53% -128.70% -1411.76% -115.67% -43.19% 409.33% 733.33% -95.63% -316.84% -130.65% 248.31% -232.84% -129.00% -250.98% -26.44% -29.73% 225.27% -66.79% 4.18% -172.45% -542.68% -62.73% -6.78% -23700.00% -100.27% 151.37% 39.05%          -36.68%    -8480.31%    1200.00% -13.53%   107.69% -44.68%   -952.22% -129.90% -913.51% -110.42% 414.49% -63.68% 555.17% -91.74% -51.39% -472.16% -171.85% -57.88% 268.39% -54.45% -35.25% 10.28% -6787.50%   -85.20% 1597.44% -86.51% -394.90% -153.26% 162.86% -53.02% 40.57% 53.62% -39.47% -12.31% -46.94% -5000.00%  
      operating margin %
    1.04% 8.76% -22.16% 21.68% 28.04% 29.75% -13.17% 11.16% -24.26% 31.47% -5.65% 14.63% 12.41% 24.80% -38.55% 45.01% -9.63% 24.38% 41.84% 12.02% 1.62% 22.17% -28.27% 40.95% 19.78% -12.03% 22.06% -144.34% -53.75% -35.32% -26.69% -69.54% -73.67% 31.05% -16.30% -50.00% -327.78% 0.07% -171.50% -23.03% -11.67% 0% 0% 0% 0% 0% 0% 0% 0% -8.47% -17.54% 0% 0% -252.62% 2.23% 0% 0% -41.33% -3.93% -3.74% 0% 2.43% 1.38% 3.07% 0% 16.40% -1.64% 5.85% -0.73% 8.22% 1.17% 7.63% 0.84% 5.69% 11.38% -9.19% 5.81% 11.78% 4.16% 7.27% 16.33% 9.73% -0.19% NaN% 3.15% 35.27% 1.55% 9.07% -5.44% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% Infinity% -Infinity% 
      nonoperating components of net periodic benefit loss
    1,000,000 3,900,000 1,000,000 1,000,000 900,000 -3,850,000 800,000 -16,300,000 100,000 25,000 -600,000 400,000 300,000                                                                                      
      interest expense
    4,000,000 4,100,000 3,400,000 3,100,000 3,400,000 1,900,000 100,000 300,000 400,000 400,000 400,000 200,000 300,000 400,000 100,000          100,000 100,000 900,000 1,000,000 1,000,000 1,100,000 1,000,000 1,000,000 1,000,000 1,000,000 700,000 700,000 2,900,000 4,900,000 4,700,000 5,100,000 5,000,000 5,000,000 4,800,000 4,900,000 4,900,000 -9,100,000 4,700,000 4,700,000 4,600,000 8,000,000 9,500,000 9,300,000 13,300,000 12,700,000 12,300,000 12,700,000 12,700,000 11,300,000 200,000 100,000  200,000 300,000 100,000  200,000 200,000 300,000 500,000 1,800,000 4,000,000 5,200,000 6,300,000 7,700,000 3,300,000 2,400,000 3,500,000 3,100,000 3,200,000 3,500,000 4,700,000 13,200,000 9,000,000  8,700,000 7,450,000 10,000,000 10,400,000 9,400,000 9,700,000 9,800,000 9,700,000 9,200,000 9,300,000 9,000,000 8,900,000 9,100,000 9,300,000 
      investment income
    -17,000,000 -16,500,000 -12,900,000 -8,000,000 -7,300,000 -5,100,000 -2,600,000 -2,400,000 -2,800,000 -2,300,000 -2,300,000 -2,200,000 -1,900,000 -1,200,000 -600,000 -200,000       -100,000  -400,000 -300,000 -500,000 -700,000 -700,000 -600,000 -700,000 -600,000 -600,000 -300,000 -400,000 -300,000 -300,000                                                              
      extinguishment of long-term debt
        -11,800,000                                                                                              
      other expense
    300,000  -100,000  100,000 25,000   100,000                                                                                 -2,075,000 -6,800,000 -2,300,000 -2,200,000 -4,400,000 -7,100,000 -1,300,000 400,000 -2,400,000 
      income before income taxes
    12,500,000 21,300,000 -8,000,000 37,400,000 35,200,000 47,800,000 -5,900,000 39,500,000 -8,400,000 58,300,000 600,000 16,000,000 9,600,000 27,600,000 -7,900,000 48,200,000 -100,000 76,400,000 42,500,000 11,800,000 5,200,000 15,600,000 -7,200,000 33,200,000 11,400,000 -2,400,000 22,800,000 -15,600,000 -21,000,000 -45,100,000 -7,800,000 -26,100,000 -25,100,000 35,600,000 -8,500,000 -22,400,000 7,400,000 -8,200,000 -41,300,000 -2,900,000 -15,200,000 -101,800,000 -55,100,000           -1,075,500,000 600,000   -202,300,000 -14,800,000 -17,000,000  14,200,000 2,900,000 14,100,000  76,600,000 -9,000,000 30,200,000 -3,600,000 37,100,000 7,400,000 19,800,000 7,400,000 39,500,000 72,800,000 -13,900,000 33,400,000 63,200,000 15,900,000 35,200,000 56,100,000 43,400,000 -7,500,000  3,000,000 69,000,000 -4,900,000 19,300,000 -18,500,000 1,300,000 5,500,000 7,500,000 3,600,000 2,000,000 9,500,000 5,400,000 15,000,000 -7,400,000 
      income tax expense
    2,500,000 3,500,000 -11,900,000 8,500,000 8,000,000 -5,900,000 -900,000 8,900,000 -2,300,000 2,000,000 -7,600,000 3,300,000 2,400,000 6,300,000 -1,800,000 10,800,000 300,000 175,000 400,000 200,000 100,000 -800,000 -200,000 -500,000 100,000                                                                          
      net income and comprehensive income
    10,000,000 17,800,000 3,900,000 28,900,000 27,200,000 53,700,000 -5,000,000 30,600,000 -6,100,000 56,300,000 8,200,000 12,700,000 7,200,000 21,300,000 -6,100,000 37,400,000 -400,000 116,200,000 42,100,000 11,600,000 5,100,000 16,400,000 -7,000,000 33,700,000 11,300,000 -3,425,000 22,800,000                                                                        
      yoy
    -63.24% -66.85% -178.00% -5.56% -545.90% -4.62% -160.98% 140.94% -184.72% 164.32% -234.43% -66.04% -1900.00% -81.67% -114.49% 222.41% -107.84% 608.54% -701.43% -65.58% -54.87% -578.83% -130.70%                                                                            
      qoq
    -43.82% 356.41% -86.51% 6.25% -49.35% -1174.00% -116.34% -601.64% -110.83% 586.59% -35.43% 76.39% -66.20% -449.18% -116.31% -9450.00% -100.34% 176.01% 262.93% 127.45% -68.90% -334.29% -120.77% 198.23% -429.93% -115.02%                                                                         
      net income margin %
    13.04% 12.18% 5.21% 18.71% 37.21% 35.42% -8.67% 16.19% -13.96% 54.34% 15.98% 12.91% 10.76% 16.88% -18.37% 37.74% -1.13% 130.56% 46.11% 18.59% 9.17% 17.65% -20.83% 44.52% 25.11% -6.15% 21.78% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% NaN% 0% 0% 0% 0% 0% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% NaN% 
      net income per share
                                         -0.9 -4.54 -0.32 -1.6 -11.31 -6.05       -4.448 -9.04   -8.89 0.04   -4.11 -0.06 -0.18  0.08 0.01 0.06  0.45 -0.06 0.16 -0.02 0.23 0.08 0.1  0.205 0.52 -0.15 0.45 0.46 0.11 0.25 0.4 0.34 -0.06  0.01 -0.04 0.14 -0.13 0.01 0.04 0.05 0.03 0.01 0.09 0.05 0.12 -0.06 
      basic
    0.51 0.93 0.21 1.63 1.6 3.28 -0.3 1.89 -0.38 3.69 0.53 0.84 0.49 1.35 -0.42 2.56 -0.03 10,029,996.25 3.01 0.81 -0.17 -2,620,000 -830,000 3,280,000 970,000 -512,500 2,180,000                                              0.04                          
      diluted
    0.45 0.74 0.19 1.59 1.6 3.27 -0.3 1.89 -0.38 3.62 0.52 0.83 0.47 1.32 -0.42 2.51 -0.03 9,749,996.34 2.95 0.79 -0.17 -2,550,000 -830,000 3,190,000 950,000 -512,500 2,170,000                                              0.04                          
      average number of common shares outstanding
                                                                                                      
      basic
    19,773 295 18,317 17,703 16,982 137 16,422 16,185 15,906 85 15,374 15,161 14,841 15 14,623 14,587 14,547 13,492,986,635 13,741 13,443 12,818 -183,000,000 10,723,000,000 9,675,000,000 9,619,000,000 2,390,000,000 9,582,000,000                                                                        
      diluted
    22,446 960 20,677 18,121 17,048 137 16,422 16,226 15,906 86 15,626 15,369 15,241 14 14,623 14,876 14,547 13,878,986,298 14,056 13,743 12,818 -159,000,000 10,723,000,000 9,927,000,000 9,839,000,000 2,390,000,000 9,626,000,000                                                                        
      equity-related compensation
     500,000 600,000                                                                                                
      stock compensation
       4,200,000                                                                                               
      special charges for workforce reductions
             3,500,000 200,000  -100,000   500,000                          -100,000 9,800,000 2,900,000                                                       
      other income
             -500,000 -1,000,000                             -400,000 -300,000                                                          
      nonoperating components of net periodic benefit income
                 4,500,000 -4,400,000 -3,400,000 -3,300,000                                                                                  
      preferred stock dividends - undeclared and cumulative
                      700,000 700,000 700,000 800,000 1,900,000 2,000,000 2,000,000 1,900,000 1,900,000 2,000,000 2,000,000 1,900,000 1,900,000 2,000,000 2,000,000 1,900,000 2,000,000 2,000,000 1,000,000                                                              
      distributed earnings allocable to retired preferred shares
                     31,000,000   6,600,000                                                                              
      net income allocable to common stockholders
                 19,800,000 -6,100,000 37,400,000  85,200,000 41,400,000 10,900,000 -2,200,000 -26,300,000 -8,900,000 31,700,000 9,300,000 -4,900,000 20,900,000      -27,000,000    6,600,000                                                              
      net loss allocable to common stockholders
                    -400,000           -17,600,000 -22,900,000 -16,200,000 -9,700,000 -28,100,000  -7,075,000 -10,500,000 -24,400,000                                                               
      nonoperating components of net periodic benefit expense
                     -54,700,000 -4,300,000 -4,300,000 -4,300,000 5,000,000 -2,200,000 -2,200,000 -2,200,000 -4,100,000 -100,000  -100,000 15,500,000 -1,600,000 -1,700,000 -1,600,000                                                                  
      special charges (credits) for workforce reductions
                         100,000 600,000  -100,000                                                                          
      gain on sales of assets
                              -200,000 -100,000 -400,000                                                                      
      net income per common share:
                                                                                                      
      basic
    0.51 0.93 0.21 1.63 1.6 3.28 -0.3 1.89 -0.38 3.69 0.53 0.84 0.49 1.35 -0.42 2.56 -0.03 10,029,996.25 3.01 0.81 -0.17 -2,620,000 -830,000 3,280,000 970,000 -512,500 2,180,000                                              0.04                          
      diluted
    0.45 0.74 0.19 1.59 1.6 3.27 -0.3 1.89 -0.38 3.62 0.52 0.83 0.47 1.32 -0.42 2.51 -0.03 9,749,996.34 2.95 0.79 -0.17 -2,550,000 -830,000 3,190,000 950,000 -512,500 2,170,000                                              0.04                          
      contract services
                             7,125,000 16,900,000 8,000,000 3,600,000 2,500,000 5,200,000 6,500,000 14,400,000 3,700,000 6,800,000 6,100,000 6,400,000 6,300,000 7,300,000 8,500,000 16,400,000 300,000 20,400,000 21,100,000 21,000,000 -21,200,000 23,300,000 16,700,000 3,000,000 3,100,000 4,200,000 3,500,000 2,600,000 21,700,000 11,000,000 14,000,000 23,600,000 39,500,000 55,300,000 56,300,000 58,000,000                                      
      special charges (credits) for workforce reductions and advisory costs
                             300,000 800,000 -2,900,000 -100,000                                                                      
      income tax benefit
                             -25,000   -100,000 -25,000   -100,000 100,000   -200,000                                                              
      gross loss
                               -4,300,000 -5,500,000   -10,700,000 -5,600,000                                                                  
      net loss and comprehensive loss
                               -15,600,000 -20,900,000                                                                      
      net loss per common share - basic and diluted
                               -1,840,000 -2,400,000 -1,777,500 -1,060,000 -3,080,000                                                                   
      average number of common shares outstanding - basic and diluted
                               9,565,000,000 9,532,000,000 33,000,000 9,133,000,000 9,118,000,000                                                                   
      advanced technology license and decommissioning costs
                                6,600,000 6,900,000 5,800,000 5,400,000 7,700,000 700,000 4,500,000 4,400,000 6,100,000                                                              
      special charges for workforce reductions and advisory costs
                                 700,000 600,000 300,000 600,000 2,400,000 2,400,000 2,300,000 2,400,000 200,000 600,000 600,000       100,000 2,500,000  47,600,000 3,500,000 3,700,000                                               
      gains on sales of assets
                                   -200,000 -100,000 -2,300,000 -600,000 -700,000 -1,000,000 -200,000 -300,000                                                            
      gain on early extinguishment of debt
                                     -8,400,000   -33,600,000 -4,175,000  -16,700,000                                                           
      net income
                                 -45,200,000 -7,800,000 -26,100,000 -25,000,000 35,500,000 -8,500,000 -22,400,000 7,600,000 -8,200,000 -41,300,000 -2,900,000 -14,600,000 -101,800,000 -55,100,000   -382,400,000 418,900,000   -21,800,000 -44,300,000   -1,084,300,000 4,500,000   -496,000,000 -6,900,000 -21,200,000  9,000,000 1,000,000 7,200,000  49,500,000 -6,200,000 17,300,000 -2,100,000 25,100,000 8,400,000 10,800,000 4,400,000 25,100,000 45,600,000 -13,400,000 39,300,000 40,100,000 9,900,000 21,600,000 34,600,000 29,600,000 -5,200,000  900,000 81,300,000 -3,400,000 11,700,000 -11,200,000 900,000 3,400,000 4,300,000 2,100,000 1,200,000 7,100,000 4,300,000 9,500,000 -4,700,000 
      net income per common share:
                                                                                                      
      – basic
                                    -2,970,000    730,000                                                              
      – diluted
                                    -2,970,000    720,000                                                              
      average number of common shares outstanding
                                                                                                      
      net loss per common share – basic and diluted
                                     -780,000 -1,150,000 -2,690,000                                                               
      average number of common shares outstanding – basic and diluted
                                     2,270,250,000 9,103,000,000 9,077,000,000                                                               
      interest
                                         -125,000 -100,000 -100,000 -300,000  -100,000  -200,000 300,000 -100,000  -400,000 -300,000  -100,000 -300,000 -1,500,000 -200,000 -100,000 -100,000 -100,000 -100,000 -100,000 -200,000  -200,000 -100,000 -100,000 -100,000 -200,000 -400,000 -600,000 -3,400,000 -4,500,000 -6,000,000 -10,800,000 -12,100,000 -3,900,000 -7,900,000 -9,900,000 -2,200,000 -1,700,000 -500,000 -1,800,000 -3,100,000 -2,300,000  -1,900,000 -675,000 -1,200,000 -800,000 -700,000 -900,000 -1,500,000        
      provision for income taxes
                                                -300,000 -1,400,000 100,000 -100,000 -1,000,000 -28,700,000 -18,500,000 -36,300,000 -3,000,000 8,800,000 -3,900,000 -2,000,000 -3,100,000 293,700,000 -7,900,000 4,200,000 -7,800,000 5,200,000 1,900,000 6,900,000 5,400,000 27,100,000 -2,800,000 12,900,000 -1,500,000 12,000,000 -1,000,000 9,000,000 3,000,000 14,400,000 27,200,000 -500,000 -5,900,000   13,600,000 21,500,000       7,600,000  1,700,000 2,100,000 3,200,000 1,500,000    5,500,000  
      net income per share
                                         -0.9 -4.54 -0.32 -1.6 -11.31 -6.05       -4.448 -9.04   -8.89 0.04   -4.11 -0.06 -0.18  0.08 0.01 0.06  0.45 -0.06 0.16 -0.02 0.23 0.08 0.1  0.205 0.52 -0.15 0.45 0.46 0.11 0.25 0.4 0.34 -0.06  0.01 -0.04 0.14 -0.13 0.01 0.04 0.05 0.03 0.01 0.09 0.05 0.12 -0.06 
      weighted-average number of shares outstanding - basic and diluted
                                         9.1 9.1 9.1 9.1                                                        
      benefit for income taxes
                                            -600,000                                                          
      gross
                                             -3,300,000 -24,400,000                                                        
      other
                                             -300,000 -300,000 -700,000 -800,000 38,100,000 -4,800,000 -8,400,000 -26,200,000 -30,100,000 -35,900,000 -40,700,000 -47,600,000 -47,500,000 -34,600,000 -10,000,000     -3,700,000 -12,000,000 -12,400,000 -10,300,000 -9,700,000                                  
      operating
                                             -96,800,000 -50,400,000 -10,200,000 -11,000,000 35,800,000 -16,400,000 -18,700,000 -39,200,000   -68,000,000 -13,700,000   -81,400,000 -19,300,000    -24,600,000    -4,400,000                                  
      reorganization items
                                                 428,400,000 -440,000,000 4,700,000 8,400,000                                                  
      weighted-average number of shares outstanding:
                                                                                                      
      basic
                                             9.1           122 122.6 121.7 122.3 120.8 121.3 121.1 119.6 112.8 113.2 112.9 111.7 111.4 111.8 111.5 110.7 110.6 110.8 110.6 109.9 93 87.9 87.1 86.8 86.6 86.7 86.6 86.3 86.1 86.3  85.5              
      diluted
                                             9.1           122 122.6 121.7 122.3 120.8 121.3 121.1 119.6 166.6 166.4 161.4 111.7 160.1 111.8 160.3 110.7 158.7 158.9 158.7 110.2 105.8 89.8 87.1 87.2 86.8 86.9 86.9 86.6 86.6 86.3  86              
      (loss) before income taxes
                                               -15,100,000 -15,700,000           -94,000,000 -31,900,000    -24,400,000    -4,300,000                                  
      net
                                               -15,100,000 -15,400,000   -28,000,000 -50,800,000   -40,900,000 -2,000,000   -92,000,000 -28,800,000    -16,600,000    -9,700,000                                  
      net (loss) per share - basic and diluted
                                               -1.68 -1.71                                                      
      special charges (credit) for workforce reductions
                                                600,000                                                      
      income from continuing operations before income taxes
                                                 -383,800,000 419,000,000   -41,675,000 -62,800,000                                                
      income from continuing operations
                                                 -382,400,000 418,900,000                                                    
      income from discontinued operations
                                                                                                      
      income per share
                                                                                                      
      basic income per share:
                                                                                                      
      weighted-average number of shares outstanding
                                                 4.9                                                    
      diluted income per share:
                                                                                                      
      (loss) from continuing operations before income taxes
                                                   -28,100,000 -51,800,000   -77,200,000 -26,700,000                                              
      net (loss) from continuing operations
                                                   -28,000,000 -50,800,000   -40,900,000 -23,700,000                                              
      net income from discontinued operations
                                                     3,000,000   21,700,000                                              
      net (loss) from continuing operations per share – basic and diluted
                                                   -5.71 -10.37   -8.35 -0.19                                              
      net (loss) per share – basic and diluted
                                                   -5.71 -10.37   -8.35 -0.02                                              
      weighted-average number of shares outstanding – basic and diluted
                                                   4.9 4.9 4.9 4.9 4.9 123.1                                              
      special charges (credit) for workforce reductions and advisory costs
                                                    -500,000                                                  
      net income from continuing operations
                                                     -27,225,000 -44,300,000                                                
      net income from continuing operations per share – basic and diluted
                                                     -5.555 -9.04                                                
      special charge for workforce reductions and advisory costs
                                                        2,400,000 1,200,000 1,500,000 3,200,000 6,400,000                                          
      net (loss) per share – basic
                                                           -0.76 -0.24    -0.14    -0.09                                  
      net (loss) per share – diluted
                                                           -0.76 -0.24    -0.14    -0.09                                  
      preferred stock issuance costs
                                                                 1,800,000 4,800,000                                    
      u.s. government contracts and other
                                                                 50,675,000 81,100,000 59,100,000 62,500,000 56,300,000 56,100,000 47,600,000 49,100,000 55,000,000 50,800,000 65,200,000 51,000,000 51,800,000 49,000,000 49,000,000 44,200,000 46,200,000 46,800,000 50,000,000 51,500,000 56,300,000 54,600,000  51,100,000              
      special charge for workforce reduction
                                                                     625,000 2,500,000                                
      special charge for organizational restructuring
                                                                                    1,500,000                  
      special charge (credit) for organizational restructuring
                                                                                 350,000 -100,000                    
      provision (credit) for income taxes
                                                                                 10,275,000 6,000,000   300,000 -2,300,000  2,100,000 -12,300,000 -1,500,000  -7,300,000     800,000 2,400,000 1,100,000  -2,700,000 
      dividends per share
                                                                                     0.138 0.138  0.138 0.103 0.138 0.138 0.138 0.138 0.138 0.138 0.138 0.138 0.138 0.138 0.138 0.138 
      special charge for workforce reductions
                                                                                     1,125,000 4,500,000                
      american centrifuge demonstration and other costs
                                                                                        22,700,000              
      u.s. government contracts
                                                                                         30,200,000 40,800,000 41,400,000 38,600,000          
      centrifuge demonstration costs
                                                                                         9,100,000 16,400,000 10,600,000 9,400,000          
      average number of shares outstanding
                                                                                         20.95 84.4 84 83 0.1 82.3 82.2 82 81.5 0.3 80.9 81 80.8 
      cost of sales
                                                                                             199,250,000 263,700,000 281,700,000 251,600,000 336,200,000 285,500,000 229,000,000 519,400,000 287,300,000 
      special charge (credit) for consolidating plant operations
                                                                                                      
      advanced technology development costs
                                                                                             13,600,000 10,600,000 11,000,000 9,600,000 6,000,000 4,500,000 2,400,000 3,200,000 2,500,000 
      special charge (credit) for consolidating operations
                                                                                                  -1,675,000 -6,700,000   
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-09-30 2002-06-30 2002-03-31 2001-12-31 2001-09-30 
                                                                                                        
        assets
                                                                                                        
        current assets:
                                                                                                        
        cash and cash equivalents
      1,868,200,000 1,957,200,000 1,631,800,000 833,000,000 653,000,000 671,400,000 194,300,000 227,000,000 209,300,000 201,200,000 183,300,000 212,500,000 188,800,000 179,900,000 131,700,000 115,600,000 168,500,000 193,800,000 171,000,000 176,000,000 163,300,000 152,000,000 152,800,000 119,300,000 109,200,000 130,700,000 77,200,000 88,300,000 87,900,000 123,100,000 124,900,000 140,100,000 153,300,000 208,800,000 135,900,000 147,700,000 151,700,000 260,700,000 170,800,000 174,500,000 179,700,000 234,000,000 180,300,000 218,500,000 225,000,000 218,800,000 105,400,000 123,300,000 85,100,000 314,200,000 128,400,000 194,700,000 71,900,000 292,900,000 303,300,000 229,000,000 72,300,000 37,600,000 117,900,000 340,200,000 149,800,000 151,000,000 146,100,000 207,500,000 32,500,000 131,300,000 69,300,000 77,700,000 37,900,000 248,500,000 358,600,000 503,800,000 805,300,000 886,100,000 774,800,000 48,300,000 238,600,000 171,400,000 96,300,000 21,600,000 21,600,000 259,100,000 147,300,000 183,000,000 242,400,000 174,800,000 15,000,000 32,400,000 146,100,000 249,100,000 66,500,000 158,300,000 132,300,000 111,100,000 279,200,000 219,300,000 57,400,000  
        accounts receivable
      41,800,000 30,700,000 60,700,000 31,300,000 38,700,000 80,000,000 19,100,000 34,500,000 19,900,000 49,400,000 9,400,000 9,000,000 34,100,000 38,100,000 7,400,000 24,000,000 12,500,000 29,100,000 16,900,000 19,000,000 15,500,000 29,600,000 14,100,000 31,200,000 17,500,000 21,100,000 19,100,000 30,200,000 39,500,000 60,200,000 2,500,000 27,900,000 15,000,000 60,200,000 14,200,000 60,600,000 5,800,000 19,900,000 7,900,000 51,300,000 55,900,000 26,500,000 20,300,000 27,100,000 20,000,000 58,900,000 90,000,000 29,700,000 38,000,000 163,000,000 158,700,000 140,900,000 153,200,000 134,800,000 171,900,000 173,400,000 198,000,000 162,000,000 223,500,000 134,000,000 244,800,000 308,600,000 228,000,000 121,100,000 189,000,000 191,400,000 164,700,000 231,400,000 259,400,000 154,100,000                             
        inventories
      336,000,000 322,900,000 416,300,000 320,500,000 429,600,000 161,600,000 190,700,000 195,300,000 279,200,000 306,400,000 210,800,000 288,600,000 209,400,000 209,200,000 209,300,000 121,100,000 89,400,000 91,100,000 80,000,000 86,500,000 83,500,000 64,800,000 66,600,000 83,000,000 67,900,000 64,500,000 105,200,000 141,700,000 75,100,000 129,700,000 129,400,000 100,000,000 164,000,000 153,100,000 124,100,000 104,000,000 143,600,000 177,400,000 185,800,000 201,200,000 211,300,000 319,200,000 257,800,000 384,800,000 419,200,000 462,200,000 499,400,000 506,800,000 571,700,000 967,600,000 1,176,800,000 959,900,000 1,060,800,000  1,936,200,000 1,924,400,000 1,941,400,000  1,721,500,000 1,717,200,000 1,696,000,000  1,472,800,000 1,359,800,000 1,282,700,000  1,435,000,000 1,270,500,000 1,089,100,000  1,258,200,000 1,220,500,000 1,187,500,000  1,044,800,000 1,062,300,000 1,008,100,000 24,200,000 1,024,400,000 899,900,000 970,800,000 71,400,000 1,102,200,000 1,205,500,000 1,059,500,000 156,200,000 1,205,100,000 1,112,500,000 1,049,000,000 266,100,000 935,200,000 929,700,000 866,000,000 893,700,000 415,500,000 835,500,000 895,900,000 1,108,200,000 
        deferred costs associated with deferred revenue
      37,000,000 40,900,000 47,700,000 47,700,000 63,900,000 63,900,000 74,900,000 94,800,000 117,600,000 117,600,000 116,000,000 137,000,000 135,700,000 135,700,000 135,300,000 135,300,000 143,300,000 143,300,000 137,200,000 137,200,000 136,000,000 151,900,000 145,400,000 145,400,000 144,100,000 144,100,000 136,100,000 138,700,000 134,900,000 134,900,000 122,700,000 130,200,000 119,600,000 122,300,000 94,500,000 118,300,000 89,000,000 89,300,000 77,400,000 74,500,000 72,700,000 63,100,000 63,000,000 58,800,000 72,900,000 82,900,000  64,100,000 80,900,000 165,500,000 136,600,000 118,700,000 106,200,000 116,800,000 92,600,000 130,800,000 139,700,000 175,500,000 159,800,000 152,500,000 216,000,000 152,900,000 184,500,000 286,800,000                                   
        other current assets
      12,400,000 11,900,000 8,100,000 18,100,000 37,500,000 38,300,000 37,900,000 40,900,000 30,500,000 10,800,000 12,400,000 9,000,000 9,000,000 24,200,000 25,200,000 23,700,000 9,400,000 8,600,000 9,100,000 7,200,000 7,800,000 7,800,000 7,400,000 7,200,000 7,800,000 9,000,000 8,300,000 7,400,000 6,600,000 6,300,000 6,900,000 22,700,000 22,400,000 22,500,000 15,600,000 14,900,000 14,700,000 13,300,000 15,100,000 14,900,000 15,100,000 15,200,000 15,800,000 15,200,000 18,500,000 19,600,000 21,600,000 21,100,000 20,000,000 21,700,000 22,600,000 18,500,000 22,200,000 19,200,000 57,900,000 67,200,000 68,300,000 64,800,000 88,000,000 95,400,000 77,800,000 71,600,000 61,100,000 68,100,000 343,400,000 297,100,000 227,900,000 230,600,000 218,500,000 188,300,000 120,800,000 135,400,000 135,700,000 88,700,000 95,800,000 92,500,000 91,000,000 97,800,000 106,500,000 91,400,000 78,300,000 68,700,000 89,400,000 30,600,000 27,200,000 31,800,000 34,400,000            
        total current assets
      2,295,400,000 2,363,600,000 2,164,600,000 1,250,600,000 1,222,700,000 1,015,200,000 516,900,000 592,500,000 656,500,000 685,400,000 531,900,000 656,100,000 577,000,000 587,100,000 508,900,000 419,700,000 423,100,000 465,900,000 414,200,000 425,900,000 406,100,000 406,100,000 386,300,000 386,100,000 346,500,000 369,600,000 363,100,000 424,300,000 374,500,000 484,500,000 416,600,000 420,900,000 474,300,000 566,900,000 384,300,000 445,500,000 404,800,000 560,600,000 457,000,000 516,400,000 534,700,000 658,000,000 537,200,000 704,400,000 755,600,000 842,400,000 716,400,000 745,000,000 795,700,000 1,632,000,000 1,623,100,000 1,436,000,000 1,429,400,000 2,156,900,000 2,561,900,000 2,524,800,000 2,419,700,000 2,191,900,000 2,334,700,000 2,462,000,000 2,423,500,000 2,254,100,000 2,135,900,000 2,086,700,000 1,891,000,000 1,969,600,000 1,942,200,000 1,863,600,000 1,666,100,000 1,890,700,000 2,056,500,000 2,041,300,000 2,435,800,000 2,430,600,000 2,294,000,000 1,366,800,000 1,539,100,000 1,409,100,000 1,452,800,000 1,359,000,000 1,310,600,000 1,615,700,000 1,660,800,000 1,579,000,000 1,488,000,000 1,481,000,000 1,428,000,000 1,372,600,000 1,364,500,000 1,426,700,000         
        property, plant and equipment, net of accumulated depreciation
      59,500,000  20,500,000 14,900,000 11,200,000  8,900,000 8,700,000 7,600,000  6,100,000 5,700,000 5,400,000  5,400,000 5,600,000 5,500,000  5,300,000 5,100,000 5,000,000  4,400,000 3,600,000 3,600,000  3,800,000 3,900,000 4,100,000  4,400,000 4,500,000 4,600,000                                                                  
        deposits for financial assurance
      32,800,000 2,700,000 2,600,000 2,600,000 2,700,000 2,600,000 2,600,000 2,600,000 13,700,000 32,400,000 32,300,000 32,300,000 32,300,000 32,300,000 21,100,000 21,100,000 12,200,000 2,800,000 5,700,000 5,700,000 5,700,000 5,700,000 5,700,000 5,700,000 5,700,000 200,000 17,200,000 18,000,000 30,500,000 30,300,000 30,200,000 19,800,000 19,800,000                                                                  
        intangible assets
      19,400,000 21,200,000 23,700,000 24,800,000 28,500,000 29,600,000 32,200,000 34,600,000 38,300,000 39,400,000 41,500,000 42,900,000 44,600,000 45,700,000 48,500,000 49,600,000 53,600,000 54,700,000 57,400,000 59,100,000 60,700,000 62,800,000 65,200,000 66,400,000 68,100,000 69,500,000 71,900,000 73,700,000 74,900,000 76,000,000 78,100,000 79,900,000 81,300,000 82,700,000 87,600,000 90,100,000 92,100,000 93,300,000 98,200,000 99,900,000 102,500,000 105,800,000 112,000,000 113,200,000 115,200,000 119,200,000 123,500,000                                                    
        deferred tax assets
      19,500,000 21,900,000 25,800,000 13,900,000 21,800,000 29,300,000 23,000,000 22,200,000 30,600,000 28,500,000 29,100,000 21,500,000 24,600,000 26,800,000 32,600,000 30,900,000 41,200,000 41,400,000                                                                                 
        other long-term assets
      6,600,000 7,000,000 7,700,000 8,000,000 7,000,000 7,300,000 7,400,000 7,600,000 3,300,000 3,500,000 3,800,000 3,500,000 5,100,000 8,100,000 1,700,000 1,800,000 2,000,000 2,300,000 4,600,000 4,800,000 6,200,000 6,800,000 6,600,000 7,100,000 6,900,000 7,400,000 6,700,000 7,700,000 4,900,000 700,000 700,000 700,000 900,000 1,100,000 15,200,000 15,300,000 15,500,000 24,100,000 23,000,000 23,000,000 23,000,000 23,600,000 20,100,000 20,500,000 22,200,000 20,600,000 20,500,000 21,200,000 25,800,000                 2,000,000 2,000,000 1,300,000 1,300,000 1,300,000                             
        total assets
      2,433,200,000 2,445,900,000 2,244,900,000 1,314,800,000 1,293,900,000 1,093,400,000 591,000,000 668,200,000 750,000,000 796,200,000 644,700,000 762,000,000 689,000,000 705,500,000 618,200,000 528,700,000 537,600,000 572,400,000 487,200,000 500,600,000 483,700,000 486,300,000 468,200,000 468,900,000 430,800,000 455,900,000 451,200,000 515,300,000 464,700,000 571,700,000 506,000,000 525,800,000 580,900,000 675,300,000 521,900,000 586,000,000 547,600,000 713,500,000 613,800,000 675,000,000 694,900,000 820,700,000 860,500,000 1,030,100,000 1,085,000,000 1,183,700,000 1,063,600,000 807,700,000 865,900,000 1,705,500,000 1,703,800,000 1,512,200,000 1,524,800,000 2,266,400,000 3,766,000,000 3,780,900,000 3,771,300,000 3,549,300,000 4,042,200,000 4,127,400,000 4,058,900,000 3,848,200,000 3,699,300,000 3,690,500,000 3,473,900,000 3,532,100,000 3,491,800,000 3,313,900,000 2,987,800,000 3,055,300,000 3,024,100,000 2,905,800,000 3,203,200,000 3,087,800,000 2,832,500,000 1,850,700,000 2,007,100,000 1,861,400,000 1,891,200,000 1,855,800,000 1,798,000,000 2,080,800,000 2,131,500,000 2,045,800,000 2,000,400,000 1,999,400,000 1,940,000,000 1,938,000,000 1,969,000,000 2,053,800,000 1,940,500,000 2,032,600,000 1,948,300,000 2,070,000,000 2,168,000,000 2,014,400,000 2,120,300,000 2,165,400,000 
        liabilities and stockholders’ equity
                                                                                                        
        current liabilities:
                                                                                                        
        accounts payable and accrued liabilities
      49,500,000 41,600,000 36,300,000 33,100,000 32,500,000 38,800,000 32,800,000 34,200,000 36,700,000 56,200,000 44,300,000 50,900,000 55,400,000 65,500,000 30,000,000 25,600,000 33,700,000 37,800,000 44,700,000 38,700,000 47,100,000 50,600,000 52,200,000 49,700,000 50,700,000 50,700,000 42,000,000 37,900,000 54,900,000 52,400,000 46,900,000 47,000,000 57,200,000 53,300,000 50,700,000 48,300,000 46,800,000 46,400,000 30,500,000 40,100,000 35,800,000 44,800,000 40,700,000 42,000,000 43,200,000 50,500,000 79,500,000 78,700,000 94,300,000 114,500,000 121,300,000 154,300,000 139,000,000 145,800,000 113,300,000 111,300,000 110,700,000 120,100,000 153,000,000 141,900,000 142,000,000 172,400,000 148,100,000 138,100,000 131,600,000 153,400,000 153,400,000 141,800,000 150,400,000 172,300,000 169,200,000 159,600,000 216,100,000 162,200,000 176,800,000 128,400,000 138,600,000 129,100,000 144,900,000 142,300,000 188,200,000 217,400,000 206,300,000 195,700,000 185,900,000 201,000,000 173,500,000 171,700,000 178,900,000 221,500,000 175,600,000 185,300,000 186,400,000 162,600,000 192,800,000 164,700,000 159,100,000 148,900,000 
        payables under inventory purchase agreements
      65,700,000 18,500,000 155,900,000 127,100,000 85,100,000 29,500,000  37,700,000 67,600,000 41,900,000 13,800,000 33,800,000 32,600,000 43,600,000 21,500,000  9,600,000 37,900,000                                                                                 
        inventories owed to customers and suppliers
      170,800,000 192,700,000 238,900,000 127,400,000 203,900,000 16,200,000 800,000 1,100,000 21,600,000 84,300,000 400,000 72,800,000 17,200,000 60,800,000 75,400,000 300,000 300,000 8,400,000 7,000,000 300,000 13,300,000 4,900,000 7,800,000 7,600,000 7,400,000 5,600,000 36,900,000 59,000,000 64,200,000 103,000,000 70,200,000 45,100,000 93,800,000 77,900,000 22,100,000 26,800,000 22,800,000 57,500,000 22,200,000 39,500,000 47,900,000 106,800,000 69,400,000 199,600,000 240,000,000 158,900,000 173,100,000 166,600,000 157,400,000 499,700,000 475,900,000 350,600,000 474,700,000 950,000,000 1,325,400,000 1,382,800,000 1,407,300,000 870,100,000 843,200,000 1,084,400,000 1,036,700,000 715,800,000 587,100,000 572,300,000 525,100,000 469,400,000 546,000,000 278,500,000 225,300,000 130,200,000 207,300,000 39,500,000 303,000,000 322,300,000 86,400,000 4,100,000 118,700,000  89,800,000                    
        deferred revenue and advances from customers
      112,800,000 131,100,000 154,800,000 154,800,000 216,500,000 216,400,000 222,600,000 257,400,000 283,000,000 282,600,000 272,700,000 295,300,000 273,300,000 273,200,000 264,900,000 264,800,000 302,800,000 303,100,000 275,200,000 276,000,000 255,500,000 283,200,000 249,700,000 248,200,000 243,000,000 266,300,000 233,100,000 267,200,000  204,500,000 175,600,000 195,000,000 170,200,000 191,800,000                195,900,000 163,700,000 165,000,000 156,800,000 125,500,000 170,400,000 178,900,000 169,100,000 205,200,000 192,100,000 188,500,000 303,900,000 179,100,000 237,600,000 379,800,000 416,900,000 325,000,000 230,800,000 231,300,000 251,100,000 196,700,000 142,100,000 152,500,000 212,500,000 119,100,000 134,800,000 136,100,000 150,600,000 133,800,000 120,800,000 126,400,000 130,200,000 132,900,000 154,600,000 44,700,000 28,300,000 20,200,000 26,000,000 30,100,000 31,000,000 25,800,000 9,300,000 28,600,000 5,100,000 43,700,000 74,900,000 52,700,000 52,200,000 76,100,000 
        short-term inventory loans
      2,500,000 38,900,000 40,300,000 39,800,000 39,800,000 39,800,000 54,600,000 53,000,000 40,200,000                                                                                          
        current debt
           6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 6,100,000 33,600,000 33,600,000 32,800,000 39,100,000                                                                    
        total current liabilities
      401,300,000 422,800,000 626,200,000 482,200,000 577,800,000 346,800,000 316,900,000 389,500,000 455,200,000 471,100,000 337,300,000 458,900,000 384,600,000 449,200,000 397,900,000 296,800,000 352,500,000 393,300,000 335,200,000 350,100,000 338,900,000 366,100,000 315,800,000 314,600,000 313,300,000 336,800,000 331,100,000 412,600,000 357,200,000 438,700,000 346,400,000 306,600,000 344,700,000 403,400,000 238,400,000 288,700,000 227,900,000 325,700,000 201,600,000 239,600,000 235,200,000 350,300,000 214,600,000 355,600,000 392,500,000 476,400,000 327,000,000 329,100,000 357,300,000 1,794,700,000 1,196,100,000 954,200,000 874,200,000 1,614,800,000 2,037,800,000 1,994,100,000 1,863,600,000 1,575,900,000 1,558,100,000 1,645,000,000 1,482,600,000 1,268,500,000 1,204,200,000 1,278,800,000 1,073,600,000 1,082,600,000 1,085,100,000 909,800,000 626,800,000 716,400,000 754,800,000 647,600,000 967,600,000 715,800,000 528,900,000 386,000,000 522,700,000 425,100,000 476,200,000 458,100,000 430,600,000 753,000,000 825,500,000 739,100,000 679,700,000 355,400,000 335,600,000 334,000,000 355,300,000 411,600,000         
        long-term debt
      1,176,100,000 1,174,800,000 1,173,500,000 390,000,000 389,500,000 472,500,000 83,500,000 86,500,000 86,500,000 89,600,000 89,600,000 92,600,000 92,600,000 95,700,000 95,700,000 98,800,000 98,800,000 101,800,000 101,800,000 104,900,000 104,900,000 108,000,000 108,000,000 111,000,000 111,000,000 114,100,000 114,100,000 117,100,000 117,100,000 120,200,000 120,200,000 155,300,000 155,300,000 157,500,000 157,500,000 159,800,000 159,800,000 234,100,000 234,100,000 227,800,000 253,900,000 247,600,000 247,600,000 244,000,000 244,000,000 240,400,000 240,400,000    530,000,000 530,000,000 530,000,000 530,000,000 530,000,000 530,000,000 530,000,000 530,000,000 530,000,000 530,000,000 615,000,000 660,000,000 575,000,000 575,000,000 575,000,000 575,000,000 575,000,000 575,000,000 575,000,000 575,000,000 575,000,000 575,000,000 575,000,000 725,000,000 725,000,000 150,000,000 150,000,000 150,000,000 150,000,000 150,000,000 150,000,000 150,000,000 150,000,000 150,000,000 150,000,000 475,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 500,000,000 
        postretirement health and life benefit obligations
      70,400,000 72,200,000 70,000,000 70,900,000 72,500,000 74,600,000 75,700,000 77,200,000 79,000,000 81,200,000 83,500,000 83,800,000 84,100,000 84,500,000 112,800,000 112,200,000 113,500,000 114,900,000 124,300,000 126,200,000 128,900,000 130,800,000 131,300,000 132,400,000 134,700,000 138,600,000 130,300,000 132,600,000 134,500,000 136,200,000 150,900,000 151,700,000 153,100,000 154,200,000 170,000,000 170,200,000 169,400,000 171,300,000 185,200,000 185,000,000 184,000,000 184,300,000 216,300,000 214,100,000 212,800,000 211,400,000 211,600,000 200,600,000 198,000,000 195,000,000 215,300,000 212,600,000 210,400,000 207,200,000 215,000,000 213,200,000 210,200,000 207,800,000 185,400,000 184,800,000 181,400,000 178,700,000 173,800,000 172,200,000 170,500,000 168,900,000 174,800,000 172,800,000 170,900,000 168,100,000 136,600,000 134,400,000 132,800,000 130,600,000 137,700,000 135,800,000 130,600,000 128,700,000 148,400,000 149,400,000 151,700,000 153,900,000 151,100,000 149,700,000 148,200,000 145,200,000 144,100,000 142,500,000 140,400,000 138,100,000 134,900,000 133,900,000 138,300,000 136,100,000 135,100,000 134,500,000 134,300,000 130,700,000 
        pension benefit liabilities
      2,900,000 3,000,000 3,800,000 3,900,000 3,900,000 4,000,000 4,600,000 4,200,000 16,900,000 17,300,000 42,200,000 43,300,000 43,400,000 43,600,000 12,400,000 16,000,000 19,600,000 23,100,000 75,900,000 114,400,000 119,000,000 124,400,000 121,200,000 131,600,000 137,200,000 141,800,000 159,000,000 161,500,000 166,400,000 168,900,000 143,500,000 155,200,000 159,200,000 161,600,000 175,000,000 177,400,000 178,600,000 179,900,000 170,600,000 171,400,000 171,500,000 172,300,000 194,200,000 171,500,000 177,300,000 179,300,000 174,100,000 104,800,000 113,800,000 121,200,000 171,200,000 180,300,000 322,400,000 321,700,000 253,900,000 252,500,000 260,300,000 258,300,000 143,000,000 145,800,000 149,000,000 145,400,000 181,500,000 179,900,000 178,500,000 176,600,000 225,500,000 227,600,000 226,900,000 223,100,000 22,500,000 22,900,000 22,700,000 23,000,000 22,600,000 22,800,000 21,000,000 20,200,000                     
        other long-term liabilities
      7,300,000 8,000,000 8,300,000 8,700,000 8,000,000 7,900,000 7,400,000 8,000,000 8,300,000 8,800,000 8,600,000 9,000,000 9,300,000 11,700,000 7,700,000 7,800,000 9,300,000 36,100,000 34,000,000 31,300,000 32,400,000 32,400,000 22,600,000 26,600,000 30,600,000 32,100,000 22,700,000 20,400,000 17,200,000 14,600,000 8,000,000 12,300,000 12,300,000 17,500,000 35,600,000 36,100,000 35,800,000 38,600,000 36,000,000 34,200,000 30,500,000 31,900,000 51,700,000 53,700,000 52,200,000 54,600,000 51,200,000 51,200,000 51,700,000                                                  
        total liabilities
      1,658,000,000 1,680,800,000 1,881,800,000 955,700,000 1,080,000,000 932,000,000 514,600,000 591,600,000 716,200,000 763,900,000 668,700,000 794,500,000 733,500,000 779,600,000 718,500,000 623,600,000 670,600,000 714,300,000 716,300,000 772,000,000 768,500,000 806,900,000 743,800,000 760,600,000 756,200,000 792,800,000 786,600,000 873,600,000 807,400,000 893,600,000 783,500,000 795,600,000 824,600,000 894,200,000 776,500,000 832,200,000 771,500,000 949,600,000 838,100,000 858,000,000 875,100,000 986,400,000 924,400,000 1,038,900,000 1,078,800,000 1,162,100,000 1,004,300,000 1,343,900,000 1,374,400,000                                                  
        commitments and contingencies
                                                                                                        
        stockholders’ equity:
                                                                                                        
        preferred stock, par value 1.00 per share, 20,000,000 shares authorized
                                                                                                        
        series a participating cumulative preferred stock, none issued
                                                                                                        
        series b senior preferred stock, none issued
                                                                                                        
        class a common stock
      1,900,000 1,900,000 1,700,000 1,700,000 1,600,000 1,600,000 1,600,000 1,600,000 1,500,000 1,500,000 1,500,000 1,500,000 1,500,000 1,400,000 1,400,000 1,400,000 1,400,000 1,400,000 1,300,000 1,300,000 1,200,000 1,100,000 1,100,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000 800,000                                                              
        class b common stock
      100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000                                                              
        excess of capital over par value
      762,400,000 762,300,000 378,300,000 378,100,000 261,900,000 236,500,000 205,200,000 200,300,000 188,200,000 180,500,000 180,200,000 179,800,000 180,500,000 158,100,000 151,700,000 150,900,000 150,100,000 140,700,000 125,400,000 125,100,000 123,300,000 85,000,000 84,800,000 61,900,000 61,800,000 61,500,000 61,400,000 61,300,000 61,300,000 61,200,000 60,300,000 60,200,000 60,100,000 60,000,000 59,800,000 59,700,000 59,600,000 59,500,000 59,400,000   59,000,000    58,600,000 58,400,000   1,216,400,000    1,200,800,000    1,212,500,000    1,172,800,000    1,179,600,000    1,184,200,000    1,186,200,000    970,600,000    970,600,000    963,900,000    1,009,000,000     1,066,100,000    
        retained earnings
      11,500,000 1,500,000                                        -229,700,000    -42,300,000    -1,520,700,000    -1,361,800,000    -210,800,000    329,900,000    322,400,000    263,900,000    215,200,000    137,500,000    31,300,000    62,200,000    -4,600,000     10,600,000    
        accumulated other comprehensive loss
      -700,000 -700,000 -700,000 -600,000 -600,000 -500,000 -500,000 -400,000 -400,000                                                                                          
        total stockholders’ equity
      775,200,000 765,100,000 363,100,000 359,100,000 213,900,000 161,400,000 76,400,000 76,600,000 33,800,000 32,300,000                                -165,700,000    21,600,000 59,300,000   -458,200,000    -472,900,000    752,400,000    1,313,800,000    1,275,600,000    1,162,400,000    1,309,500,000    986,000,000    907,600,000    924,600,000    886,200,000         
        total liabilities and stockholders’ equity
      2,433,200,000 2,445,900,000 2,244,900,000 1,314,800,000 1,293,900,000 1,093,400,000 591,000,000 668,200,000 750,000,000 796,200,000                                820,700,000 860,500,000 1,030,100,000 1,085,000,000 1,183,700,000 1,063,600,000 807,700,000 865,900,000 1,705,500,000 1,703,800,000 1,512,200,000 1,524,800,000 2,266,400,000 3,766,000,000 3,780,900,000 3,771,300,000 3,549,300,000 4,042,200,000 4,127,400,000 4,058,900,000 3,848,200,000 3,699,300,000 3,690,500,000 3,473,900,000 3,532,100,000 3,491,800,000 3,313,900,000 2,987,800,000 3,055,300,000 3,024,100,000 2,905,800,000 3,203,200,000 3,087,800,000 2,832,500,000 1,850,700,000 2,007,100,000 1,861,400,000 1,891,200,000 1,855,800,000 1,798,000,000 2,080,800,000 2,131,500,000 2,045,800,000 2,000,400,000 1,999,400,000 1,940,000,000 1,938,000,000 1,969,000,000 2,053,800,000 1,940,500,000 2,032,600,000 1,948,300,000 2,070,000,000 2,168,000,000 2,014,400,000 2,120,300,000 2,165,400,000 
        property, plant and equipment
       29,500,000    9,400,000    7,000,000    5,500,000    5,300,000    4,900,000    3,700,000    4,200,000    4,900,000 5,200,000 5,500,000 5,600,000 6,000,000 6,100,000 6,200,000 4,900,000 3,500,000 3,500,000 3,400,000 3,400,000 3,500,000 3,700,000 3,900,000 5,200,000 7,900,000 13,000,000 18,400,000 43,900,000 51,000,000 1,134,900,000 1,130,600,000 1,181,900,000 1,187,100,000 1,321,400,000 1,286,700,000 1,263,300,000 1,231,400,000 1,195,300,000 1,170,000,000 1,143,700,000 1,115,100,000 1,063,500,000 964,000,000 864,100,000 736,100,000 593,300,000 482,300,000 395,800,000 292,200,000 239,100,000 205,900,000 192,000,000 189,900,000 174,600,000 169,600,000 170,100,000 171,200,000 172,700,000 174,400,000 175,100,000 178,000,000 174,400,000 180,700,000 183,000,000 185,100,000 188,400,000 190,100,000 191,100,000 187,400,000 191,500,000 185,300,000 195,900,000 191,800,000 
        long-term inventory loans
          28,300,000 26,200,000 26,500,000 26,200,000 37,500,000 63,100,000 74,700,000 74,100,000 73,300,000 48,700,000 45,800,000 45,800,000                                                                                   
        accumulated deficit
        -16,300,000 -20,200,000 -49,100,000 -76,300,000 -130,000,000 -125,000,000 -155,600,000 -149,500,000 -205,800,000 -214,000,000 -226,700,000 -233,900,000 -253,700,000 -247,600,000 -285,000,000 -284,600,000 -356,500,000 -398,600,000 -410,200,000 -407,700,000 -367,000,000 -360,000,000 -393,700,000 -405,000,000 -402,200,000 -425,000,000 -409,400,000 -388,500,000 -343,300,000 -335,500,000 -309,400,000 -284,500,000 -320,000,000 -311,500,000 -289,100,000 -296,700,000 -288,500,000                                                            
        advances from customers
              32,800,000 32,800,000 32,800,000 32,800,000 46,200,000 46,200,000 46,200,000 46,200,000 45,100,000 45,100,000 45,100,000 45,100,000 44,400,000 45,200,000 44,900,000 44,400,000 29,400,000 29,400,000 29,400,000 29,400,000 15,000,000 15,000,000 14,500,000 14,500,000                                                   1,800,000                
        stockholders’ equity
                                                -63,900,000 -8,800,000 6,200,000   -536,200,000 -508,500,000  -462,100,000 -419,200,000 -469,600,000  652,200,000 642,600,000 728,900,000  1,322,100,000 1,325,100,000 1,341,800,000  1,285,600,000 1,280,700,000 1,269,200,000  1,184,600,000 1,187,300,000 1,164,200,000  1,333,400,000 1,325,400,000 1,313,000,000  1,247,600,000 989,400,000 1,006,000,000  979,100,000 967,600,000 943,800,000  889,800,000 902,300,000 921,700,000  862,400,000 873,600,000 869,400,000  894,700,000 901,400,000 906,900,000 940,700,000  952,100,000 957,900,000 958,600,000 
        accumulated other comprehensive income
               -300,000  100,000 100,000 200,000 200,000                                                                                    
        liabilities and stockholders’ deficit
                                                                                                        
        stockholders’ deficit:
                                                                                                        
        total stockholders’ deficit
                -24,000,000 -32,500,000 -44,500,000 -74,100,000 -100,300,000 -94,900,000 -133,000,000 -141,900,000 -229,100,000 -271,400,000 -284,800,000 -320,600,000 -275,600,000 -291,700,000 -325,400,000 -336,900,000 -335,400,000 -358,300,000 -342,700,000 -321,900,000 -277,500,000 -269,800,000 -243,700,000 -218,900,000 -254,600,000 -246,200,000 -223,900,000 -236,100,000 -224,300,000                                                            
        total liabilities and stockholders’ deficit
                644,700,000 762,000,000 689,000,000 705,500,000 618,200,000 528,700,000 537,600,000 572,400,000 487,200,000 500,600,000 483,700,000 486,300,000 468,200,000 468,900,000 430,800,000 455,900,000 451,200,000 515,300,000 464,700,000 571,700,000 506,000,000 525,800,000 580,900,000 675,300,000 521,900,000 586,000,000 547,600,000 713,500,000 613,800,000 675,000,000 694,900,000                                                          
        accumulated other comprehensive income, net of tax
                     300,000 400,000 500,000 500,000 600,000 700,000 800,000 800,000 900,000 1,000,000 1,100,000 -100,000 -100,000 -100,000 -100,000   100,000 100,000 100,000 100,000 100,000 200,000 3,900,000   4,100,000    4,400,000                                                     
        long-term inventory loan
                      31,800,000                                                                                  
        series b senior preferred stock, 7.5% cumulative, 0 and 41,720 shares issued and outstanding as of december 31, 2021 and december 31, 2020, respectively; aggregate liquidation preference of 53.9 as of december 31, 2020
                                                                                                        
        payables under swu purchase agreements
                        2,200,000 29,000,000 16,900,000 21,300,000  3,000,000 6,100,000 8,100,000 13,000,000 14,900,000  46,000,000 14,600,000 19,500,000 23,500,000 79,400,000 17,300,000 19,900,000 100,000 59,600,000 16,500,000 34,500,000 24,400,000 85,400,000 8,400,000 23,200,000  140,100,000                                                     
        series b senior preferred stock, 7.5% cumulative, 37,847 and 41,720 shares issued and outstanding as of september 30, 2021 and december 31, 2020, respectively; aggregate liquidation preference of 51.0 as of september 30, 2021 and 53.9 as of december 31, 2020
                        100,000                                                                                
        series b senior preferred stock, 7.5% cumulative, 37,847 and 41,720 shares issued and outstanding as of june 30, 2021 and december 31, 2020, respectively; aggregate liquidation preference of 50.3 as of june 30, 2021 and 53.9 as of december 31, 2020
                         100,000                                                                               
        series b senior preferred stock, 7.5% cumulative, 37,847 and 41,720 shares issued and outstanding as of march 31, 2021 and december 31, 2020, respectively; aggregate liquidation preference of 49.6 as of march 31, 2021 and 53.9 as of december 31, 2020
                          100,000                                                                              
        series b senior preferred stock, 7.5% cumulative, 41,720 and 104,574 shares issued and outstanding as of december 31, 2020 and december 31, 2019, respectively; aggregate liquidation preference of 53.9 as of december 31, 2020 and 127.2 as of december 31, 2019
                           100,000                                                                             
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 133.1 as of september 30, 2020 and 127.2 as of december 31, 2019
                            4,600,000                                                                            
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 131.2 as of june 30, 2020 and 127.2 as of december 31, 2019
                             4,600,000                                                                           
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 129.2 as of march 31, 2020 and 127.2 as of december 31, 2019
                              4,600,000                                                                          
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 127.2 as of december 31, 2019 and 119.3 as of december 31, 2018
                               4,600,000                                                                         
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 125.2 as of september 30, 2019 and 119.3 as of december 31, 2018
                                4,600,000                                                                        
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 123.2 as of june 30, 2019 and 119.3 as of december 31, 2018
                                 4,600,000                                                                       
        deferred revenue
                                  204,500,000      131,700,000 166,500,000 123,300,000 123,600,000 104,100,000 99,800,000 97,700,000 83,900,000 75,400,000 70,300,000 89,000,000 100,900,000 700,000 83,800,000 105,600,000                                                  
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 121.3 as of march 31, 2019 and 119.3 as of december 31, 2018
                                  4,600,000                                                                      
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 119.3 and 111.5 as of december 31, 2018 and 2017, respectively
                                   4,600,000                                                                     
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 117.4 as of september 30, 2018 and 111.5 as of december 31, 2017
                                    4,600,000                                                                    
        current assets
                                                                                                        
        current liabilities
                                                                                                        
        stockholders’ deficit
                                             -183,000,000 -180,200,000                                                          
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 115.4 as of june 30, 2018 and 111.5 as of december 31, 2017
                                     4,600,000                                                                   
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 113.5 as of march 31, 2018 and 111.5 as of december 31, 2017
                                      4,600,000                                                                  
        deposits for surety bonds
                                       19,700,000 29,600,000 29,600,000 29,600,000 29,500,000 29,500,000 29,500,000 29,800,000 29,800,000 29,800,000 30,900,000 31,100,000 34,800,000 35,900,000 37,600,000 39,200,000 39,800,000 39,800,000 29,400,000 22,600,000  51,700,000 107,500,000 151,300,000  144,400,000 140,800,000 140,800,000  110,200,000 155,300,000 155,300,000  173,800,000 173,700,000 156,000,000  108,800,000 98,100,000 97,600,000  66,200,000 65,700,000 65,200,000  27,800,000                    
        decontamination and decommissioning obligations
                                       1,000,000 16,600,000 27,200,000 34,900,000 38,600,000  25,700,000 29,400,000 29,400,000                                                         
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 111.5 million as of december 31, 2017
                                       4,600,000                                                                 
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 109.6 million as of september 30, 2017
                                        4,600,000                                                                
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 107.6 million as of june 30, 2017
                                         4,600,000                                                               
        series b senior preferred stock, 7.5% cumulative, 104,574 shares issued and outstanding and an aggregate liquidation preference of 105.6 million at march 31, 2017
                                          4,600,000                                                              
        preferred stock, par value 1.00 per share, 20,000,000 shares authorized, none issued
                                                                                                        
        common stock
                                           800,000 900,000   900,000        500,000                12,300,000    12,300,000    12,300,000    10,000,000    10,000,000    10,000,000    10,000,000     10,000,000    
        decontamination and decommissioning obligations - current
                                            28,300,000                                                            
        decontamination and decommissioning obligations - long-term
                                            10,600,000                                                            
        preferred stock, 1.00 par value per share, 20,000,000 shares authorized, none issued
                                                                                                        
        excess reorganization value
                                                137,200,000 137,200,000 137,200,000 137,200,000 137,200,000                                                    
        deferred taxes
                                                20,700,000 20,500,000 20,300,000 26,000,000                                                     
        convertible senior notes
                                                       530,000,000                                                 
        convertible preferred stock (predecessor), 85,900 shares issued
                                                                                                        
        preferred stock (predecessor), par value 1.00 per share, 25,000,000 shares authorized, no shares recorded as stockholders’ equity at december 31, 2013
                                                                                                        
        common stock (predecessor), par value 0.10 per share, 25,000,000 shares authorized, 5,211,000 shares issued at december 31, 2013
                                                                                                        
        preferred stock (successor), par value 1.00 per share, 20,000,000 shares authorized, none issued at december 31, 2014
                                                                                                        
        common stock (successor), par value 0.10 per share, 100,000,000 shares authorized, 9,000,000 shares issued at december 31, 2014
                                                   900,000                                                     
        treasury stock
                                                       -34,300,000    -33,000,000    -49,400,000    -57,100,000    -71,300,000    -84,100,000    -92,900,000    -95,500,000    -99,500,000    -109,200,000    -127,700,000     -136,800,000    
        deferred income taxes
                                                    26,400,000            24,000,000 22,700,000 39,100,000 47,500,000 43,400,000 43,400,000 43,400,000 48,600,000 45,300,000 53,400,000 61,200,000 67,900,000 72,500,000 69,100,000 64,700,000 49,500,000 36,200,000 26,800,000 26,000,000 24,000,000 34,100,000 27,500,000 28,400,000 39,100,000 30,600,000 17,300,000 21,500,000 26,500,000 34,700,000 54,000,000 52,300,000 52,500,000 42,800,000 45,100,000 54,400,000 47,700,000 51,500,000 48,200,000 56,400,000  
        payables under russian contract
                                                    47,300,000   340,700,000 324,800,000 177,300,000  209,800,000 246,300,000 141,700,000  206,900,000 284,800,000 145,200,000  201,200,000 231,400,000 188,600,000  134,800,000 154,900,000 258,200,000  121,500,000 109,800,000 158,600,000 95,600,000 112,200,000 130,900,000 117,400,000 114,700,000 105,300,000 120,700,000 143,900,000 78,400,000 111,600,000 135,400,000 120,200,000 86,500,000 89,700,000 136,100,000 90,800,000 110,400,000 119,300,000 91,400,000 142,200,000 66,700,000 127,700,000 156,400,000  99,800,000 106,600,000 
        preferred stock (successor), par value 1.00 per share, 20,000,000 shares authorized, none issued at september 30, 2014
                                                                                                        
        common stock (successor), par value 0.10 per share, 100,000,000 shares authorized, 9,000,000 shares issued at september 30, 2014
                                                    900,000                                                    
        accumulated other comprehensive loss, net of tax
                                                       -120,100,000    -291,900,000    -212,900,000    -144,100,000    -167,400,000    -213,900,000    -11,300,000    -36,600,000                     
        convertible preferred stock
                                                        110,400,000 107,000,000 103,700,000  97,400,000 94,400,000 91,500,000  85,900,000 83,300,000 80,700,000                                      
        liabilities subject to compromise
                                                     658,200,000 653,600,000                                                  
        goodwill
                                                           6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 6,800,000 7,400,000 7,500,000    4,300,000 4,300,000 4,300,000             
        other assets
                                                       25,800,000 27,900,000 28,400,000 28,900,000 29,400,000                                             
        total other long-term assets
                                                       65,600,000 67,700,000 57,800,000 51,500,000 58,500,000 69,200,000 125,500,000 169,700,000 170,300,000 386,100,000 378,700,000 372,100,000 362,700,000 368,100,000 433,800,000 439,200,000 447,400,000 486,100,000 486,300,000 457,600,000 428,500,000 374,300,000 382,200,000 371,600,000 365,000,000 299,400,000 278,000,000 276,000,000 262,400,000 263,800,000 327,200,000 317,300,000 293,900,000 298,000,000 292,400,000               
        credit facility term loan
                                                           83,200,000 85,000,000 85,000,000 85,000,000 85,000,000 85,000,000 85,000,000                                       
        convertible preferred stock and accrued dividends payable-in-kind, 85,900 shares issued
                                                       113,900,000                                                 
        other liabilities
                                                       52,800,000 53,300,000 54,300,000 57,400,000 65,400,000 76,900,000 76,800,000 78,300,000 79,700,000 78,000,000 78,100,000 78,000,000 78,200,000 84,200,000 88,900,000 98,300,000 97,800,000 99,000,000 98,400,000 97,900,000 90,800,000 88,100,000 91,000,000 87,200,000 85,600,000 84,100,000 84,100,000 98,400,000 79,900,000 71,200,000 70,800,000 69,400,000 69,300,000 69,800,000 66,900,000 66,500,000 66,200,000   51,600,000 50,900,000 50,200,000 49,600,000 48,800,000 47,400,000 46,700,000 61,800,000 59,700,000 59,300,000 
        total other long-term liabilities
                                                       369,000,000 439,800,000 447,200,000 590,200,000 594,500,000 546,000,000 614,200,000 648,800,000 691,000,000 546,100,000 544,000,000 538,800,000 527,700,000 558,700,000 556,000,000 556,100,000 598,900,000 647,100,000 641,800,000 621,800,000 601,500,000 360,900,000 357,800,000 347,600,000 337,500,000 331,000,000 325,300,000 328,400,000 300,300,000 285,900,000 280,100,000 273,600,000 270,200,000 266,200,000 254,400,000               
        preferred stock, par value 1.00 per share, 25,000,000 shares authorized, no shares recorded as stockholders’ equity
                                                                                                        
        restricted cash
                                                         3,300,000 15,100,000                                4,700,000         11,900,000     
        inventories:
                                                                                                        
        separative work units
                                                           880,900,000    1,048,600,000    947,400,000    805,100,000    813,000,000    677,300,000    701,700,000    790,300,000    740,600,000    673,000,000         
        uranium
                                                           703,700,000    690,000,000    562,500,000    482,100,000    402,100,000    465,900,000    189,100,000    171,300,000    251,600,000    187,900,000         
        materials and supplies
                                                           8,600,000    13,400,000    12,600,000    14,000,000    16,800,000    10,200,000    9,200,000    12,700,000    17,200,000    22,300,000         
        total inventories
                                                           1,593,200,000    1,752,000,000    1,522,500,000    1,301,200,000    1,231,900,000    1,153,400,000    900,000,000    974,300,000    1,009,400,000    883,200,000         
        deposit for surety bonds
                                                           22,300,000    151,300,000    140,800,000    158,300,000    135,100,000    97,000,000    60,800,000                     
        convertible preferred stock and accrued dividends payable-in-kind,
                                                                                                        
        85,900 shares issued
                                                           100,500,000                                             
        depleted uranium disposition
                                                           200,000 200,000 71,700,000 100,000,000 145,200,000 139,700,000 135,300,000 130,400,000 125,400,000 119,200,000 115,000,000 108,800,000 155,600,000 147,800,000 143,000,000 126,100,000 119,500,000 113,700,000 109,500,000 104,900,000 98,300,000 86,600,000 82,600,000 78,400,000 71,500,000 66,300,000 59,900,000 52,500,000 47,000,000 43,500,000 32,900,000 29,400,000 26,100,000 27,600,000 28,900,000 45,600,000 53,500,000 57,200,000 56,300,000 56,400,000 57,900,000 58,000,000 71,900,000 67,300,000 64,300,000 
        preferred stock, par value 1.00 per share, 25,000,000 shares
                                                                                                        
        authorized, no shares recorded as stockholders’ equity
                                                                                                        
        authorized, 130,273,000 shares issued
                                                           13,000,000                                             
        deferred financing costs
                                                            10,700,000 11,200,000 11,600,000 12,200,000 12,800,000 11,600,000 11,000,000 10,600,000 10,500,000 12,700,000 11,600,000                                  
        deferred income taxes, net of valuation allowance
                                                                                                        
        convertible preferred stock, current, 85,900 shares issued
                                                               88,600,000                                         
        convertible preferred stock, non-current, 75,800 shares issued
                                                                                                        
        authorized, 130,273,000 and 123,320,000 shares issued
                                                               13,000,000                                         
        convertible preferred stock, 75,800 shares issued
                                                                   78,200,000                                     
        authorized, no shares recorded as stockholders' equity
                                                                                                        
        authorized, 123,320,000 shares issued
                                                                   12,300,000                                     
        series b-1 12.75% convertible preferred stock
                                                                    75,800,000                                    
        bond financing costs
                                                                       10,000,000 10,500,000 11,000,000 11,500,000 12,000,000 12,500,000 12,900,000 13,400,000 13,800,000 14,500,000                        
        current portion of long-term debt
                                                                           95,700,000 126,400,000 137,400,000          288,800,000 325,000,000 325,000,000 325,000,000              
        preferred stock, par value 1.00 per share, 25,000,000 shares authorized, none issued
                                                                                                        
        pension asset
                                                                            73,700,000 71,600,000 69,400,000 67,100,000 16,600,000 14,800,000 15,700,000 13,800,000                     
        accounts receivable — trade
                                                                            246,400,000 112,500,000  252,900,000        256,700,000 277,500,000 103,000,000     128,100,000          
        intangibles
                                                                             100,000 100,000 200,000 300,000 400,000 500,000 600,000 3,300,000 3,400,000                   
        accounts receivable – trade
                                                                              242,600,000  342,400,000 136,900,000 175,400,000 215,900,000 191,500,000 307,200,000 196,700,000    132,700,000 238,500,000 159,400,000 203,000,000  254,500,000 268,900,000 248,100,000 212,700,000 250,100,000 185,100,000 159,300,000 389,300,000 213,000,000 
        current portion of long-term debt and short-term borrowings
                                                                              140,400,000                          
        short-term debt
                                                                                  100,000   26,000,000 20,500,000                  
        restricted short-term investments
                                                                                     11,400,000 14,800,000 17,800,000 13,800,000 9,600,000               
        uranium owed to customers and suppliers
                                                                                   56,900,000  19,500,000 13,300,000 2,300,000 4,200,000 53,500,000 54,000,000 44,500,000  41,400,000           
        deferred compensation
                                                                                       -2,700,000    -1,600,000    -500,000     -600,000    
        prepaid pension benefit costs
                                                                                    86,200,000 86,000,000 85,700,000 86,200,000 86,500,000 85,100,000 84,000,000 82,900,000 80,900,000 79,500,000 79,200,000 76,300,000 70,600,000 74,400,000 81,900,000 84,300,000 82,800,000    
        deposit for depleted uranium
                                                                                     27,800,000 25,800,000 24,600,000 24,600,000 24,600,000 24,600,000              
        goodwill and other intangibles
                                                                                      11,000,000 11,100,000 10,100,000                
        other comprehensive income
                                                                                       -2,100,000    -700,000             
        short-term investments
                                                                                         30,000,000               
        total other assets
                                                                                          337,300,000 340,400,000 337,600,000 384,700,000 421,500,000 442,000,000         
        total other liabilities
                                                                                          249,000,000 244,400,000 242,000,000 230,400,000 244,300,000 256,000,000         
        prepayment and deposit for depleted uranium
                                                                                           23,500,000 23,500,000 23,500,000 40,200,000 47,100,000 47,100,000 47,200,000 47,100,000 46,100,000 46,000,000    
        termination settlement obligation under power purchase agreement
                                                                                                        
        prepaid items
                                                                                            14,100,000            
        lease turnover and other liabilities
                                                                                            63,600,000 52,300,000           
        other
                                                                                             24,700,000 41,300,000 39,900,000 35,300,000 31,700,000 23,600,000 35,500,000 26,700,000 20,100,000 10,500,000 18,200,000 
        uranium owed to suppliers
                                                                                              35,000,000 45,000,000         
        liabilities accrued for consolidating plant operations
                                                                                                13,700,000 17,300,000 19,400,000 24,200,000 25,600,000    
        uranium owed to customers
                                                                                                   5,800,000 5,800,000 19,600,000 14,100,000 28,200,000 
        prepayments and deposits for depleted uranium
                                                                                                     42,200,000 44,300,000  
        prepaid pension costs
                                                                                                     81,100,000 79,700,000 78,300,000 
        liabilities accrued for consolidating operations
                                                                                                     25,800,000   
        workforce reductions and ceasing uranium enrichment at portsmouth plant
                                                                                                      36,600,000  
        current assets cash and cash equivalents
                                                                                                       39,900,000 
        other assets deferred income taxes
                                                                                                       48,600,000 
        deferred costs for depleted uranium
                                                                                                       25,000,000 
        discontinue uranium enrichment at portsmouth plant
                                                                                                       34,600,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-09-30 2002-06-30 2002-03-31 2001-12-31 2001-09-30 
                                                                                                          
          operating
                                                                                                          
          net income
        10,000,000 17,800,000 3,900,000 28,900,000 27,200,000 53,700,000 -5,000,000 30,600,000 -6,100,000 56,300,000 8,200,000 12,700,000 7,200,000 21,300,000 -6,100,000 37,400,000 -400,000 116,200,000 42,100,000 11,600,000 5,100,000 16,400,000 -7,000,000 33,700,000 11,300,000        -25,000,000    7,600,000     -101,800,000    -382,400,000                9,000,000 1,000,000   49,500,000 -6,200,000 17,300,000 -2,100,000 25,100,000 8,400,000 10,800,000 4,400,000 25,100,000 45,600,000 -13,400,000 39,300,000 40,100,000 9,900,000 21,600,000 34,600,000 29,600,000 -5,200,000 -3,000,000 900,000 26,400,000 -3,400,000 11,700,000 -11,200,000 900,000 3,400,000 4,300,000 2,100,000 1,200,000 7,100,000 4,300,000 9,500,000 -4,700,000 
          adjustments to reconcile net income to cash from operating activities:
                                                                                                          
          depreciation and amortization
        2,200,000 3,000,000 1,500,000 3,900,000 1,500,000 2,900,000 2,700,000 3,900,000 1,300,000 2,300,000 1,600,000 1,900,000 1,300,000 2,900,000 1,300,000 4,100,000 1,300,000 2,800,000 1,800,000 1,800,000 2,200,000 2,600,000 1,300,000 1,900,000 1,500,000 2,500,000 1,900,000 1,300,000 1,300,000 2,300,000 1,800,000 1,700,000 1,600,000 5,400,000 3,000,000 2,200,000 1,400,000 5,000,000 1,900,000 2,600,000 3,600,000 6,300,000 1,300,000 2,000,000 4,200,000 300,000 100,000 1,300,000 2,800,000 4,800,000 6,400,000 7,000,000 9,400,000 10,000,000 8,000,000 9,300,000 10,200,000 9,500,000 10,400,000 15,200,000 15,000,000 13,100,000 10,700,000 9,800,000 9,700,000 8,700,000 8,500,000 7,600,000 7,100,000 6,600,000 6,000,000 11,000,000 10,600,000 11,400,000 9,300,000 9,700,000 9,100,000 10,200,000 9,200,000 8,300,000 9,000,000  8,700,000 8,800,000 8,400,000 8,200,000 8,100,000 7,800,000 7,700,000          
          deferred tax assets
        2,500,000 3,800,000 -11,900,000 8,000,000 7,500,000 -6,200,000 -800,000 8,400,000 -2,100,000 700,000 -7,600,000 3,100,000 2,200,000 5,900,000 -1,800,000 10,300,000 300,000                                                                                  
          equity-related compensation
        400,000 500,000                                                                                                 
          revaluation of inventory borrowings
        -600,000  500,000 1,500,000 2,100,000  1,900,000                                                                                            
          gain on extinguishment of 8.25% notes
         -11,800,000                                                                                              
          amortization of debt issuance costs and discount
        1,300,000                                                                                                  
          other reconciling adjustments
        300,000 -2,000,000 800,000 700,000 600,000   100,000 300,000                                                                                         
          changes in operating assets and liabilities:
                                                                                                          
          accounts receivable
        -11,100,000 30,000,000 -29,400,000 7,300,000 41,300,000 -60,800,000 15,400,000 -14,600,000 29,500,000 -40,000,000 -500,000 23,900,000 5,300,000 -30,800,000 16,700,000 -11,500,000 16,600,000 -12,200,000 2,100,000 -3,600,000 14,200,000 -15,600,000 17,100,000 -13,700,000 3,600,000 -2,000,000 6,700,000 13,400,000 11,200,000 -47,900,000 25,500,000 -13,100,000 45,200,000 -32,100,000 46,600,000 -55,100,000 23,000,000 -11,900,000                                                             
          inventories
        -48,800,000 87,200,000 -95,700,000 46,600,000 -268,100,000 15,600,000 4,600,000 53,600,000 27,200,000 -106,800,000 77,800,000 -77,100,000 22,300,000 10,400,000 -88,200,000 -21,800,000 11,100,000 -12,900,000 13,300,000 -800,000 -10,300,000 8,700,000 16,900,000 100,000 100,000 9,400,000 -2,700,000 -32,200,000 25,600,000 30,400,000 10,200,000 15,400,000 5,000,000 26,800,000 -24,800,000 43,600,000 -900,000 43,700,000                                                             
          inventories owed to customers and suppliers
        -21,900,000 -46,300,000 111,600,000 -76,500,000 187,700,000 15,400,000 -300,000 -20,500,000 -62,700,000 83,900,000 -72,400,000 55,600,000 -43,600,000 -14,500,000 75,000,000 -8,100,000                                                                                  
          other current assets
        -600,000 2,000,000 -1,100,000 500,000 800,000 -600,000   -800,000 1,500,000 -1,800,000 100,000 15,100,000 1,000,000 -1,500,000                                                                                    
          accounts payable and other liabilities
        400,000 4,900,000 1,600,000 100,000 -6,200,000 7,400,000 -1,200,000 -2,500,000 -5,100,000 11,000,000 -400,000 2,100,000 -4,200,000 4,500,000 6,100,000 -9,200,000 1,200,000 -11,800,000 5,600,000 -5,000,000 6,600,000 1,800,000 1,500,000 -3,100,000 1,300,000 -1,100,000 4,600,000 -17,000,000 1,200,000 5,100,000 5,600,000 -1,600,000 -5,400,000 -8,500,000 -10,600,000 -6,300,000 -18,400,000 8,200,000                                                             
          payables under inventory purchase agreements
        47,200,000 -137,400,000 28,800,000 42,000,000 55,600,000 29,500,000 -37,700,000 -29,900,000 25,700,000 28,100,000 -20,000,000 1,300,000 -11,100,000 22,000,000 21,600,000 -9,600,000 -28,300,000                                                                                  
          deferred revenue and advances from customers, net of deferred costs
        -14,400,000 -17,000,000 100,000 -12,700,000 100,000 4,800,000 -14,900,000 -5,400,000 400,000 8,400,000 -1,600,000 5,200,000 100,000 7,900,000 200,000 -30,300,000 -300,000 21,800,000 -800,000 4,700,000 -12,500,000 27,200,000 1,800,000 4,000,000 -23,300,000 25,100,000 -8,100,000                                                                        
          pension and postretirement benefit liabilities
        -2,000,000  -1,000,000 -1,700,000 -2,200,000  -1,000,000 -2,600,000 -2,600,000  -500,000 -500,000 -700,000  -3,000,000 -4,900,000 -5,100,000  -40,500,000 -7,400,000 -7,400,000  -11,500,000 -8,000,000 -8,600,000                                                                          
          other changes
         100,000 -200,000 -100,000 -100,000   -100,000                                                                                         
          cash from operating activities
        -35,100,000 -48,400,000 10,100,000 52,800,000 36,500,000 57,900,000 -33,200,000 7,000,000 5,300,000 17,900,000 -24,000,000 24,900,000 -9,700,000 55,700,000 21,100,000 -43,600,000 -12,600,000 49,200,000 -2,100,000 11,400,000 -8,500,000 61,900,000 13,600,000 10,100,000 -18,500,000 37,800,000 18,600,000 -13,200,000 -31,900,000 3,300,000 -12,000,000 -13,400,000 -52,300,000 70,500,000 -8,600,000 -5,000,000 -82,000,000 89,600,000                                                             
          investing
                                                                                                          
          capital expenditures
        -23,200,000 -9,600,000 -4,400,000 -3,600,000 -2,100,000 -700,000 -1,000,000 -900,000 -1,500,000 -500,000 -400,000 -400,000 -300,000 -100,000 -100,000 -400,000 -100,000 -500,000 -300,000 -400,000 -500,000 -800,000 -100,000 -200,000 -200,000                                                             
          free cash flows
        -58,300,000 -58,000,000 5,700,000 49,200,000 34,400,000 57,200,000 -34,200,000 6,100,000 3,800,000 17,400,000 -24,400,000 24,500,000 -10,000,000 55,600,000 21,000,000 -44,000,000 -12,700,000 48,700,000 -2,100,000 11,100,000 -8,900,000 61,400,000 12,800,000 10,100,000 -18,500,000 37,800,000 18,600,000 -13,200,000 -31,900,000 3,300,000 -12,000,000 -13,400,000 -52,400,000 70,300,000 -8,800,000 -5,000,000 -82,000,000 89,600,000                                                             
          cash from investing activities
        -23,200,000 -9,600,000 -4,400,000 -3,600,000 -2,100,000 -700,000 -1,000,000 -900,000 -1,500,000 -500,000 -400,000 -400,000 -300,000 -100,000 -100,000 -400,000 -100,000 -500,000 -300,000 -400,000 -500,000 -800,000   -100,000 200,000   100,000 100,000   2,400,000 200,000 1,000,000 600,000 300,000                                                             
          financing
                                                                                                          
          proceeds from the issuance of common stock
         384,000,000 -200,000 114,700,000 25,200,000 31,300,000 4,400,000 11,900,000 7,100,000 1,200,000 22,000,000                                                                                      
          common stock withheld for tax obligations under stock-based compensation plan
        -300,000  -400,000 -2,800,000 300,000 -300,000                                                                                            
          payment of interest classified as debt
         -3,500,000 -3,000,000 -3,100,000 -3,000,000 -3,100,000 -3,000,000 -3,100,000 -3,000,000 -3,100,000 -3,000,000 -3,100,000 -3,000,000 -3,100,000 -3,100,000 -3,000,000                                                                 
          payment of principal to redeem 8.25% notes
         -74,300,000                                                                                              
          cash from financing activities
        -300,000 383,500,000 781,800,000 112,200,000 -52,600,000 419,700,000 1,400,000 11,600,000 4,400,000 -4,200,000 -800,000 18,900,000 3,800,000 -4,900,000 -3,200,000 -28,800,000      100,000 -3,000,000 -1,200,000 -30,700,000 -3,100,000 -5,000,000 -3,100,000 -3,000,000 -3,400,000 -27,600,000                                                             
          effect of exchange rate changes on cash, cash equivalents and restricted cash
        -300,000 100,000 -100,000 -100,000   -100,000                                                                                          
          decrease in cash, cash equivalents and restricted cash
        -58,900,000                       10,100,000 -21,500,000 36,500,000 -11,900,000 -12,700,000 -35,000,000 -1,600,000 -15,000,000 -13,200,000 -55,300,000                                                                  
          cash, cash equivalents and restricted cash, beginning of period
        1,960,100,000  704,000,000  233,800,000  212,400,000 196,800,000 157,900,000 136,600,000 159,700,000                                                                     
          cash, cash equivalents and restricted cash, end of period
        1,901,200,000  787,600,000 161,300,000 685,700,000  -32,700,000 17,700,000 241,900,000  -29,200,000 23,700,000 221,300,000 59,400,000 16,100,000 -44,000,000 180,900,000 19,900,000 -5,000,000 12,700,000 169,200,000 -800,000 33,500,000 10,100,000 115,100,000 36,500,000 -11,900,000 -12,700,000 124,700,000 -1,600,000                                                                     
          accrued loss on long-term contract
                 -3,300,000 -5,400,000 -5,700,000 -5,600,000 20,000,000 -500,000 -700,000 -1,800,000 -2,700,000 -2,000,000 -1,900,000 -3,400,000 -1,800,000 -3,500,000                                                                          
          loss on remeasurement of retirement benefit plans
                                                                                                          
          revaluation of inventory borrowing
                300,000 3,900,000 600,000 800,000 2,100,000 2,500,000                                                                                   
          pension and postretirement liabilities
                                 -3,600,000 -4,800,000 -6,900,000 -4,200,000 -6,700,000                                                                     
          proceeds from the issuance of 0% and 2.25% convertible senior notes
                                                                                                          
          exercise of stock options
             400,000     200,000 200,000 400,000 100,000 200,000 200,000 100,000 200,000                                                                          
          common stock withheld for tax obligations under equity-related compensation plan
                                                                                                          
          other
                 1,100,000 -1,300,000 200,000 600,000 -900,000 -1,900,000   -1,200,000 -100,000 200,000 1,000,000 900,000 -100,000 -600,000 -100,000 -100,000 -9,400,000 -200,000 800,000 -5,300,000 -500,000 -1,400,000 900,000 -100,000   800,000 -400,000 2,700,000 1,800,000 4,200,000 -2,700,000 -1,000,000 800,000 2,800,000 -1,400,000 -3,300,000 28,600,000 -4,300,000 1,400,000 5,300,000 13,200,000 7,200,000 -16,800,000 -3,100,000 -7,600,000 8,600,000 -6,600,000 11,900,000 4,900,000 14,600,000 1,700,000 10,700,000 -22,400,000 600,000 -21,400,000 300,000 7,200,000 -1,300,000 -5,700,000 600,000 9,100,000 -4,000,000 -10,600,000 2,200,000  -6,000,000 3,600,000 5,600,000              
          increase in cash, cash equivalents and restricted cash
         325,500,000 787,600,000 161,300,000 -18,300,000 477,100,000 -32,700,000 17,700,000 8,100,000 18,000,000 -29,200,000 23,700,000 8,900,000 59,400,000 16,100,000 -44,000,000 -15,900,000 19,900,000 -5,000,000 12,700,000 11,300,000 -800,000                                                                             
          cash, cash equivalents and restricted cash, beginning of year
                                                                                                          
          cash, cash equivalents and restricted cash, end of year
                                                                                                          
          gain on remeasurement of retirement benefit plans
              -200,000                                                                                            
          proceeds from the issuance of 0% convertible senior notes
                                                                                                          
          supplemental cash flow disclosures:
                                                                                                          
          cash paid for income taxes
          100,000                                                                                               
          cash paid for interest
                                                                                                         
          non-cash activities:
                                                                                                          
          adjustment of right to use lease assets from lease modification
                 4,200,000                                                                                      
          property, plant and equipment included in accounts payable and accrued liabilities
          1,600,000 400,000 200,000  -400,000 400,000 100,000       200,000  300,000 100,000 200,000                                                                             
          equity related compensation
           4,200,000 500,000  400,000 500,000 200,000  400,000 400,000 1,200,000  800,000 900,000 500,000                                                                                  
          equity issuance costs included in accounts payable and accrued liabilities
               -200,000 300,000            400,000                                                                              
          retirement benefit plans losses
                                                                                                          
          proceeds from the issuance of 2.25% convertible senior notes
                                                                                                          
          shares withheld for employee taxes
                   -800,000 1,900,000   1,900,000                                                                                  
          atm proceeds included in accounts receivable
                    1,200,000                                                                                      
          redemption of preferred stock
                                                                                                          
          withholding of shares to fund grantee tax obligations under stock-based compensation plan
                 -1,100,000                                                                                      
          reclassification of stock-based compensation liability to equity
                      10,600,000  7,500,000                                                                              
          retirement benefit plans (gains) losses
                                                                                                          
          supplemental cash flow information:
                                                                                                          
          common stock and warrant issued in exchange for preferred stock
                          7,500,000                                                                              
          disposal of right to use lease assets from lease modification
                                                                                                         
          proceeds from the sale of common stock
                           4,000,000 23,200,000 -700,000                                                                             
          payments for deferred issuance costs
                                                                                                          
          payables under swu purchase agreements
                          -26,800,000 12,200,000 -4,400,000 21,300,000 -3,000,000 -3,200,000 -1,900,000 -4,900,000 -1,900,000 14,900,000 -46,000,000 31,400,000 -4,900,000 -4,000,000 -55,900,000 62,100,000 -2,600,000 19,800,000 -59,500,000 43,100,000                                                             
          payment of equity issuance costs
                          -200,000 -100,000                                                                              
          cash from (used) in financing activities
                           1,600,000 20,200,000                                                                              
          payment of deferred issuance costs
                                                                                                          
          deferred financing costs included in accounts payable and accrued liabilities
                                -500,000 400,000                                                                         
          immediate recognition of retirement benefit plans losses
                                                                                                          
          pik interest on paid-in-kind toggle notes
                                 400,000 300,000 400,000 500,000 300,000 500,000 400,000 1,700,000 400,000 800,000 6,300,000 3,400,000                                                         
          gain on sales of assets
                                 -200,000 -100,000 -400,000 -100,000 -200,000 -100,000 -2,300,000 -600,000 -700,000 -1,000,000 -200,000 -400,000 -300,000 -300,000 -300,000 -300,000 -700,000 -800,000                                                      
          inventory valuation adjustments
                                           2,300,000           200,000                                                 
          proceeds from sales of assets
                                 200,000   100,000 100,000 200,000 100,000 2,600,000 400,000 1,100,000 600,000 300,000 200,000 400,000 600,000 200,000 300,000 1,300,000 200,000                                                      
          principal payments on debt
                                                                                                         
          interest paid in cash
                                 1,100,000 400,000 6,300,000 400,000 400,000 2,100,000 1,700,000 400,000                                                              
          deferred equity issuance costs included in accounts payable and accrued liabilities
                                                                                                          
          disposal of right to use lease assets for early termination
                                                                                                          
          conversion of interest payable-in-kind to debt
                                 700,000                                                                     
          right to use lease assets acquired under operating leases
                                                                                                          
          adjustments to reconcile net loss to cash from operating activities:
                                                                                                          
          payments for deferred financing costs
                                -100,000 -1,200,000                        -100,000 -100,000 -2,000,000  -300,000 -100,000 -9,700,000       -2,100,000 -7,500,000                                  
          balance at december 31, 2018
                                4,600,000                                                                          
          net income for the three months ended march 31, 2019
                                                                                                          
          issuance and amortization of restricted stock units and stock options
                                                                                                          
          balance at march 31, 2019
                                4,600,000                                                                          
          net loss
                                 -2,800,000 22,800,000 -15,600,000 -20,900,000  -7,800,000    -8,500,000   -8,200,000 -41,300,000 -2,900,000 -14,600,000                                                          
          gain on early extinguishment of debt
                                         -33,600,000                                                            
          additional right of use operating lease assets recorded
                                                                                                          
          disposal of right of use operating lease assets for early termination
                                                                                                          
          exchange of debt for class a common stock
                                                                                                          
          right to use lease assets acquired under operating lease
                                                                                                          
          deferred revenue, net of deferred costs
                                     16,800,000 -12,000,000 14,200,000 -18,900,000 13,000,000 -11,000,000   7,600,000                                             50,200,000 3,400,000 2,400,000              
          operating activities:
                                                                                                          
          investing activities:
                                                                                                          
          financing activities:
                                                                                                          
          extinguishment of debt
                                                                                                          
          payment of securities transaction costs
                                                                                                          
          exchange of debt for series b preferred stock
                                                                                                          
          repurchase of debt
                                         -27,600,000 -1,800,000                                                            
          operating activities
                                                                                                          
          investing activities
                                                                                                          
          financing activities
                                                                                                          
          cash, cash equivalents and restricted cash at beginning of period
                                       244,800,000                                                                  
          cash, cash equivalents and restricted cash at end of period
                                       -13,200,000 189,500,000                                                                  
          conversion of interest payable-in-kind to long-term debt
                                       900,000 -400,000 800,000 3,400,000 1,800,000                                                      
          deposits for surety bonds - net decrease
                                               1,000,000 300,000 3,700,000 -2,800,000 1,700,000 1,600,000 600,000 -10,400,000                                                
          increase in cash and cash equivalents
                                                                                                          
          cash and cash equivalents at beginning of period
                                         260,700,000 234,000,000 218,800,000 -208,800,000 314,200,000 292,900,000 37,600,000 151,000,000 131,300,000 248,500,000 886,100,000 171,400,000 259,100,000  174,800,000 -35,000,000 249,100,000 171,100,000 279,200,000  122,500,000 
          cash and cash equivalents at end of period
                                         72,900,000 -11,800,000 -4,000,000 151,700,000 89,900,000 -3,700,000 -5,200,000 179,700,000 53,700,000 -38,200,000 -6,500,000 225,000,000 113,400,000 -17,900,000 38,200,000 85,100,000 185,800,000 -66,300,000 122,800,000 71,900,000 -10,400,000 74,300,000 156,700,000 72,300,000 -80,300,000 -222,300,000 190,400,000 149,800,000 4,900,000 -61,400,000 175,000,000 32,500,000 62,000,000 -8,400,000 39,800,000 37,900,000 -110,100,000 -145,200,000 -301,500,000 805,300,000 111,300,000 726,500,000 -190,300,000 238,600,000 75,100,000 74,700,000 21,600,000  -35,700,000 -59,400,000 242,400,000 159,800,000 -17,400,000 -113,700,000 146,100,000 182,600,000 -91,800,000 26,000,000 132,300,000 111,100,000  161,900,000 17,500,000 39,900,000 
          decrease in cash and cash equivalents
                                          -11,800,000 -4,000,000 -109,000,000                                                              
          impairment of excess reorganization value
                                                                                                          
          immediate recognition of net actuarial losses
                                                 -50,500,000                                                         
          interest paid
                                             2,900,000 500,000 3,100,000 6,200,000 6,000,000     8,900,000 8,600,000 3,200,000                        4,500,000 -400,000 4,900,000 14,800,000  15,600,000 100,000 16,100,000 1,000,000 17,000,000 200,000 17,000,000 600,000 16,600,000 600,000 16,900,000 16,800,000 -100,000 16,500,000 16,600,000 
          income taxes paid, net of refunds
                                                         400,000  800,000 200,000 300,000  200,000 900,000 1,200,000 500,000 -12,800,000                                    
          immediate recognition of net actuarial loss
                                                                                                          
          adjustments to reconcile net loss to net cash from operating activities:
                                                                                                          
          accounts receivable – decrease
                                               4,200,000 -29,400,000 -9,700,000 7,200,000 -5,400,000 37,200,000 -48,000,000 -58,900,000 12,900,000 125,000,000     11,300,000 1,500,000 24,600,000 -36,000,000 61,500,000 -89,500,000 110,800,000 63,800,000   67,900,000 2,400,000        10,300,000  -205,500,000 38,500,000 40,500,000 -24,400,000 115,700,000 -110,500,000 60,000,000    105,800,000              
          inventories, net – decrease
                                               1,500,000 48,500,000 -24,000,000 -3,200,000 -6,000,000 124,100,000 -154,000,000 49,300,000 74,100,000 53,600,000 232,800,000 -96,700,000 -33,100,000 57,100,000 -32,400,000 -69,200,000 -7,500,000 347,800,000                                          
          payables under swu purchase agreements –
                                               10,100,000 -61,000,000  -14,800,000 23,200,000 -140,100,000                                                      
          deferred revenue, net of deferred costs – increase
                                               200,000 4,200,000     27,000,000 1,100,000 -5,100,000 -5,700,000 3,300,000 -20,000,000 -4,300,000 41,900,000 -1,100,000 64,300,000 28,700,000 -1,600,000 -1,300,000 -3,700,000 -52,100,000 62,300,000 -14,700,000 -27,500,000 -31,000,000 62,600,000        49,300,000  -5,400,000 -10,700,000 22,600,000 13,100,000 -4,800,000 -1,500,000 -10,500,000                  
          accounts payable and other liabilities –
                                               5,500,000 -9,800,000 10,300,000 600,000 -4,100,000 -8,600,000 39,300,000 -31,000,000 -18,500,000 -16,300,000           10,000,000 -18,200,000    -11,700,000          31,900,000 -27,400,000 -9,700,000   -45,900,000 -31,700,000    -9,100,000              
          net cash from operating activities
                                               5,000,000 -54,900,000 53,600,000 -39,300,000 -8,100,000 2,300,000 330,500,000 -26,900,000 36,300,000 -229,700,000 185,800,000 -55,800,000 126,500,000 -175,300,000 -37,600,000 18,400,000 114,400,000 47,700,000 -50,900,000 -178,400,000 234,300,000 51,300,000 -7,500,000 -143,200,000 216,100,000 -42,900,000 124,000,000 97,700,000 197,900,000 23,800,000 79,300,000 -14,200,000 -190,700,000 20,700,000 213,500,000 -21,500,000 -170,300,000 87,500,000 125,100,000 113,300,000 2,600,000 37,100,000 168,700,000 -18,000,000 -42,300,000 80,500,000 249,800,000 -6,600,000   197,300,000 -75,500,000 43,200,000 -20,100,000 -135,300,000 84,400,000 186,100,000 57,100,000 -65,200,000 
          net cash from investing activities
                                               -2,200,000 600,000 100,000 1,100,000 1,600,000 3,900,000 -9,100,000 9,700,000 2,000,000 600,000 -10,400,000 -3,500,000 39,600,000 29,000,000 56,100,000 42,600,000 -2,900,000 -29,300,000 -42,900,000 -40,300,000 -50,700,000 -69,700,000 10,000,000 -38,900,000 -46,000,000 -62,400,000 -105,400,000 -158,300,000 -137,700,000 -157,700,000 -120,100,000 -107,900,000 -91,500,000 -100,500,000 -28,500,000 -21,300,000 -20,100,000 -50,000,000 -13,500,000 -8,600,000 -7,500,000  -8,800,000 -5,700,000 -6,100,000 -21,200,000 -1,900,000   -4,400,000 -5,600,000 -6,500,000 -8,400,000 -17,800,000 -13,800,000 -14,000,000   
          net cash from financing activities
                                                      -700,000   -100,000 -200,000 -85,300,000 -1,800,000 -200,000 -300,000 -10,100,000 -100,000 -1,000,000 -3,600,000 -1,800,000 82,100,000 71,800,000 -2,200,000 -9,900,000 400,000 -700,000 200,000 -96,700,000 -31,700,000 -10,900,000 -2,900,000 -10,000,000 -1,700,000 776,500,000 1,300,000 -200,000 -25,100,000 6,000,000 -267,100,000  -8,900,000 -11,400,000 -6,800,000 -33,800,000 -8,900,000   -10,300,000 -10,700,000 -10,700,000 -10,300,000 -15,000,000 -10,700,000 -10,200,000 -11,200,000 -9,800,000 
          net
                                                  -8,000,000 -15,100,000 -15,400,000  -130,000,000 -28,000,000 -50,800,000 -71,700,000 -44,300,000 -40,900,000 -2,000,000  4,500,000 -92,000,000 -28,800,000  -6,900,000 -21,200,000 -16,600,000    -9,700,000  -8,400,000 39,800,000 -210,600,000                  -17,400,000 -113,700,000 -103,000,000     -168,100,000   17,500,000 -82,600,000 
          cash flows from operating activities
                                                                                                          
          inventory valuation adjustment
                                                500,000                                                          
          cash flows from investing activities
                                                                                                          
          cash flows from financing activities
                                                                                                          
          net increase
                                                -54,300,000    6,200,000     185,800,000 -66,300,000 122,800,000 -221,000,000 -10,400,000 74,300,000 156,700,000 34,700,000 -80,300,000 -222,300,000   4,900,000 -61,400,000       -110,100,000 -145,200,000 -301,500,000 -80,800,000 111,300,000   67,200,000   -237,500,000   -59,400,000 67,600,000     182,600,000 -91,800,000 26,000,000 -38,800,000  59,900,000    
          adjustments to reconcile net income to net cash from operating activities:
                                                                                                          
          non-cash reorganization items
                                                                                                          
          payables under swu purchase agreements – increase
                                                                                                          
          common stock purchased
                                                                                                          
          deferred revenue, net of deferred costs –
                                                  900,000 -4,700,000 -1,900,000                                                      
          common stock issued (purchased)
                                                        -100,000 -100,000 100,000 -200,000 -400,000 200,000 100,000 -1,800,000 300,000 400,000 200,000 -2,700,000  200,000 -1,000,000  100,000 100,000 -400,000   800,000 -600,000                      
          adjustments to reconcile net (loss) to net cash from operating activities:
                                                                                                          
          interest on paid-in-kind toggle notes
                                                   1,800,000                                                      
          transfers and retirements of machinery and equipment
                                                         500,000                                                 
          convertible preferred stock dividends payable-in-kind
                                                         3,500,000 3,400,000 3,300,000 3,200,000                                              
          gain on sales of assets and subsidiary
                                                     4,400,000 -4,800,000                                                    
          accrued depleted uranium disposition – increase
                                                         100,000 -100,000   -71,500,000 -28,300,000 -45,200,000 5,500,000 4,400,000 4,900,000 5,000,000 6,200,000 4,200,000                                    
          proceeds from sales of assets and subsidiary
                                                     -6,300,000 8,000,000                                                    
          repayment of credit facility term loan
                                                         -83,200,000                                              
          inventory valuation adjustments reflecting declines in market price indicators
                                                                                                          
          payables under russian contract – increase
                                                         15,900,000    -36,500,000    -77,900,000 139,600,000   -30,200,000 42,800,000          -16,600,000  13,500,000 2,700,000 9,400,000 -15,400,000 -23,200,000                    
          accrued depleted uranium disposition - increase
                                                                                                          
          reorganization and special charge items, non-cash
                                                                                                          
          payables under russian contract –
                                                       -340,700,000   177,300,000 -209,800,000   141,700,000 -206,900,000    -201,200,000    -134,800,000                -33,200,000    -3,200,000              
          reorganization items, non-cash
                                                        1,600,000                                                  
          deferred income taxes
                                                            -2,600,000  -2,400,000 -2,300,000 -2,300,000 299,400,000 -5,100,000 9,200,000 -1,900,000 12,400,000 17,400,000 5,500,000 9,000,000 -1,500,000 8,000,000 -4,900,000 -3,200,000 14,800,000 18,000,000 -11,400,000 -18,300,000 -18,700,000 -13,400,000 600,000 -9,100,000 -4,800,000 -7,800,000 -6,200,000 5,400,000  -28,200,000                
          gain on sale of subsidiary
                                                         -35,600,000                                              
          restricted cash –
                                                            -15,100,000                                              
          proceeds from sale of subsidiary
                                                         3,300,000 39,900,000                                              
          expense of american centrifuge capital assets
                                                                                                          
          other non-cash income on release of disposal obligation
                                                             -47,500,000 -34,600,000   -600,000 -12,000,000 -12,400,000 -10,300,000 -9,700,000                                  
          gain on extinguishment of convertible notes
                                                                                                          
          accounts payable and other liabilities – increase
                                                         -2,100,000 -36,100,000 -40,900,000 -3,400,000 11,900,000 11,700,000 1,300,000 2,300,000 -10,500,000    15,000,000 11,500,000          27,500,000                          
          borrowings under revolving credit facility
                                                              27,100,000 96,500,000                                          
          repayments under revolving credit facility
                                                              -27,100,000 -96,500,000                                          
          accounts receivable –
                                                          -17,800,000 9,000,000 -15,100,000                                              
          transfer of machinery and equipment to u.s. department of energy
                                                                                                         
          non-cash transition charges
                                                                                                          
          accrued depleted uranium disposition –
                                                                                                          
          deposits for surety bonds
                                                            -300,000             15,700,000 -17,600,000 -20,600,000 -25,000,000    -29,200,000 -4,000,000                      
          transfers and retirements of property, plant and equipment
                                                                                                          
          preferred stock issuance costs and capitalized dividends paid-
                                                                                                          
          or payable-in-kind
                                                                                                          
          gain on extinguishment of convertible senior notes
                                                                 -3,100,000                                      
          deposits for surety bonds, net decrease
                                                                                                          
          borrowings under credit facility
                                                                     400,000 100,000       1,300,000 9,200,000 37,800,000 4,000,000 65,200,000 4,800,000 1,100,000 500,000 7,500,000 26,800,000 99,000,000                  
          repayments under credit facility
                                                                     -400,000 -100,000       -1,300,000 -9,500,000 -37,500,000 -4,000,000 -65,200,000 -4,900,000 -1,000,000 -500,000 -33,500,000 -21,300,000 -78,500,000                  
          proceeds from (repayment of) credit facility term loan
                                                                                                          
          proceeds from issuance of convertible preferred stock and warrants
                                                                                                          
          payments for deferred financing costs and preferred stock issuance costs
                                                                 -300,000    -3,200,000                                     
          supplemental cash flow information
                                                                                                          
          interest paid, net of capitalized interest
                                                                             4,600,000 1,100,000 6,500,000 3,700,000  4,300,000                        
          adjustments to reconcile net (loss) to net cash fromoperating activities:
                                                                                                          
          capitalized convertible preferred stock dividends paid-in-kind
                                                              3,000,000 2,900,000 2,900,000   2,600,000 2,500,000                                      
          expense of capital assets
                                                                                                          
          cash flows from (used in) investing activities
                                                                                                          
          deposits for surety bonds – net decrease
                                                                                                          
          interest paid, net of amount capitalized
                                                              3,300,000 10,200,000 3,000,000          3,700,000 100,000 1,800,000                              
          deposits for surety bonds - decrease
                                                                                                          
          preferred stock issuance costs and capitalized dividends paid-in-kind
                                                                 2,700,000                                         
          proceeds from credit facility term loan
                                                                                                          
          repayment and repurchases of senior notes
                                                                         -95,700,000                              
          inventories, net –
                                                                                                          
          proceeds from issuance of series b-1 convertible preferred stock and warrants
                                                                                                          
          inventories – decrease
                                                                    147,400,000  -98,200,000 -29,900,000 74,200,000                                  
          tax benefit related to stock-based compensation
                                                                        300,000         600,000 300,000  100,000 300,000                  
          preferred stock issuance costs and capitalized paid-in-kind dividends
                                                                     2,900,000                                     
          inventories – net decrease
                                                                                  99,800,000   92,100,000 10,500,000                    
          deposits for surety bonds – decrease
                                                                      45,100,000 3,000,000                                  
          accrued depleted uranium disposition
                                                                        -46,800,000 7,800,000 4,800,000 16,900,000 6,600,000 5,800,000 4,200,000 4,600,000 6,600,000 11,700,000 4,000,000 4,200,000 6,900,000                      
          income taxes paid
                                                                        14,700,000 -800,000 1,000,000 2,100,000 2,200,000 800,000 1,300,000 43,700,000 4,200,000 52,300,000 14,200,000 32,500,000 2,900,000 34,700,000 21,500,000 28,200,000 22,900,000  2,400,000 1,000,000 12,400,000 -4,500,000 800,000 7,300,000 -7,200,000   -6,200,000 100,000 700,000   
          proceeds from issuance of convertible senior notes
                                                                                                         
          payments made for deferred financing costs
                                                                                                          
          common stock issued (purchased), net of issuance costs
                                                                                                          
          accounts receivable — decrease
                                                                            -105,300,000 92,300,000 -133,900,000            -174,500,000      126,400,000          
          inventories — decrease
                                                                            237,900,000                              
          payables under russian contract — increase
                                                                             11,700,000 -48,800,000            15,200,000                
          deferred revenue, net of deferred costs — increase
                                                                            15,400,000 9,700,000 2,300,000                            
          accounts payable and other liabilities — increase
                                                                            -21,800,000                              
          payables under russian contract —
                                                                            -121,500,000                    -8,900,000          
          impairment of intangible asset
                                                                                                          
          inventories — net decrease
                                                                                                          
          accounts payable and other liabilities —
                                                                             -13,500,000 -1,100,000                            
          repayment and repurchases of senior notes, including premiums
                                                                                                          
          common stock issued, net of issuance costs
                                                                                 -300,000                         
          inventories —
                                                                              130,100,000                            
          repurchase of senior notes
                                                                              -11,000,000 -2,700,000 -9,900,000                          
          bond issuance costs paid
                                                                                                          
          inventories –
                                                                                -53,400,000                          
          dividends paid to stockholders
                                                                                          -11,800,000 -11,900,000 -11,700,000 -11,700,000 -11,600,000 -11,500,000 -11,500,000 -11,300,000 -11,300,000 -11,300,000 -11,300,000 -11,200,000 -11,200,000 -11,100,000 -11,200,000 -11,100,000 
          repayment of senior notes
                                                                                      -288,800,000                  
          inventories – net
                                                                                    -22,100,000    -3,000,000    -32,500,000              
          short-term investments – decrease
                                                                                                          
          payment of termination settlement obligation under power purchase agreement
                                                                                             -33,200,000          
          accounts payable and other liabilities – increase.
                                                                                                          
          investment in nac holding inc., net of cash acquired
                                                                                                          
          deposit relating to acquisition of nac holding inc.
                                                                                                          
          excess tax benefit related to stock-based compensation
                                                                                                          
          common stock issued
                                                                                     300,000 800,000 500,000 900,000  2,900,000 500,000 4,900,000 3,500,000 2,700,000 2,200,000 5,900,000 1,000,000 600,000 600,000 1,000,000 900,000 500,000 900,000 1,300,000 
          depleted uranium disposition
                                                                                      6,400,000 5,400,000 4,300,000  10,600,000 3,500,000 2,200,000    -1,000,000          
          short-term investments –
                                                                                                          
          cash flows from operating activities:
                                                                                                          
          adjustments to reconcile net income to net cash from operating activities
                                                                                                          
          net effect of changes in operating assets and liabilities:
                                                                                                          
          short-term investments
                                                                                                          
          net, accounts receivable, accounts payable and other liabilities
                                                                                                          
          net, inventories, deferred revenue and payables under russian contract
                                                                                                          
          other items
                                                                                                          
          cash flows used in investing activities:
                                                                                                          
          acquisition related
                                                                                                          
          net cash (used in) investing activities
                                                                                                -5,600,000          
          short-term investments — decrease
                                                                                                          
          inventories — net
                                                                                          70,500,000                
          adjustments to reconcile net income to net cash from (used in) operating activities:
                                                                                                          
          deposit for surety bond
                                                                                                          
          deferred financing costs
                                                                                                     -4,700,000     
          deferred revenue and advances from customers
                                                                                              -4,100,000 -900,000 -1,600,000          
          liabilities accrued for consolidating plant operations
                                                                                                          
          accounts payable and other — net increase
                                                                                                          
          accounts payable and other – net increase
                                                                                                          
          adjustments to reconcile net income to net cash (used in) operating activities:
                                                                                                          
          inventories — net increase
                                                                                                -153,000,000          
          income taxes payable — net increase
                                                                                                -14,900,000          
          accounts payable and other — net
                                                                                                -2,100,000          
          net cash (used in) operating activities
                                                                                                -91,800,000          
          cash flows used in investing activities
                                                                                                          
          cash flows used in financing activities
                                                                                                          
          net cash (used in) financing activities
                                                                                                -5,600,000          
          insurance deposit
                                                                                                        
          repayment of short-term debt
                                                                                                          
          repurchase of common stock
                                                                                                          
          restricted cash
                                                                                                     -11,900,000     
          adjustments to reconcile net income to net cash provided by operating activities:
                                                                                                          
          special charges for consolidating plant operations
                                                                                                          
          suspension of development of avlis technology
                                                                                                          
          uranium inventory valuation adjustment
                                                                                                          
          cash and cash equivalents at beginning of fiscal year
                                                                                                          
          cash and cash equivalents at end of fiscal year