7Baggers

NiSource Quarterly Balance Sheets Chart

Quarterly
 | 
Annual
 
 Goodwill  
 Account Receivables  
 Cash and Cash Eq  
 Account Payables  
20200930 20201231 20210331 20210630 20210930 20211231 20220331 20220630 20220930 20221231 20230331 20230630 20230930 20231231 20240331 20240630 20240930 20241231 20250331 20250630 00.320.640.961.281.61.922.25Billion

NiSource Quarterly Balance Sheets Table

Quarterly
 | 
Annual
 
Unit: USD2025-06-30 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 2010-06-30 2010-03-31 2009-12-31 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 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 
                                                                                  
  assets                                                                                
  property, plant and equipment                                                                                
  plant36,448,300,000 35,312,500,000 34,152,900,000 33,453,800,000 32,031,100,000 31,300,600,000 30,482,100,000 29,816,100,000 29,135,400,000 28,065,600,000 27,551,300,000 26,641,100,000 26,046,100,000 25,538,300,000 25,171,300,000 25,438,200,000 24,948,200,000 24,524,700,000 24,179,900,000                                                              
  accumulated depreciation and amortization-8,996,800,000 -8,822,600,000 -8,699,000,000 -8,572,400,000 -8,418,500,000 -8,354,500,000 -8,207,200,000 -8,104,100,000 -7,960,200,000 -7,838,000,000 -7,708,700,000 -7,650,100,000 -7,534,400,000 -7,417,600,000 -7,289,500,000 -7,917,100,000 -7,793,100,000 -7,688,000,000 -7,560,400,000 -5,659,000,000 -5,549,000,000 -7,293,700,000 -7,609,300,000 -7,563,200,000 -7,461,000,000 -7,356,900,000 -7,257,900,000 -7,171,000,000 -7,083,700,000 -7,048,100,000 -6,953,600,000 -6,906,200,000 -6,833,700,000 -6,701,500,000 -6,613,700,000 -7,020,200,000 -7,040,300,000 -6,957,300,000 -6,853,400,000 -6,811,500,000 -9,718,800,000 -9,686,700,000 -9,578,600,000 -9,533,200,000 -9,444,200,000 -9,358,600,000 -9,256,500,000 -9,258,600,000 -9,169,700,000 -9,075,400,000 -8,986,400,000 -8,956,800,000 -8,882,800,000 -8,805,900,000 -8,670,200,000 -8,672,300,000 -8,602,900,000 -8,528,000,000 -8,492,600,000 -8,547,300,000 -8,443,500,000 -8,353,700,000 -8,232,900,000 -8,134,100,000 -8,080,800,000 -8,078,000,000 -7,982,500,000 -7,819,100,000 -7,813,400,000 -8,000,000,000 -7,939,800,000 -7,850,000,000 -7,788,400,000 -7,710,600,000 -7,637,200,000 -7,556,800,000 -7,495,800,000 -7,416,000,000 -7,340,900,000 -7,247,600,000 
  net property, plant and equipment27,451,500,000 26,489,900,000 25,453,900,000 24,881,400,000 23,612,600,000 22,946,100,000 22,274,900,000 21,712,000,000 21,175,200,000 20,227,600,000 19,842,600,000 18,991,000,000 18,511,700,000 18,120,700,000 17,881,800,000 17,521,100,000 17,155,100,000 16,836,700,000 16,619,500,000 16,079,000,000 15,772,400,000 15,587,200,000 16,912,200,000 16,480,900,000 16,133,800,000 15,741,400,000 15,542,500,000 15,174,400,000 14,847,900,000 14,456,600,000 14,359,500,000 14,042,100,000 13,669,300,000 13,288,900,000 13,068,000,000 12,853,800,000 12,555,900,000 12,267,200,000 12,111,500,000 11,690,700,000 16,908,300,000 16,283,400,000 16,017,100,000 15,586,500,000 15,088,800,000 14,657,700,000 14,365,100,000 13,912,400,000 13,473,900,000 13,118,900,000 12,915,900,000 12,542,700,000 12,149,000,000 11,902,000,000 11,800,100,000 11,548,700,000 11,295,000,000 11,140,600,000 11,097,000,000 10,800,000,000 10,697,200,000 10,683,900,000 10,543,100,000 10,476,700,000 10,388,100,000 10,261,800,000 10,126,100,000 9,676,000,000 9,871,100,000 9,804,900,000 9,740,900,000 9,694,500,000 9,551,600,000 9,502,000,000 9,497,200,000 9,554,300,000 9,425,800,000 9,374,100,000 9,357,500,000 9,384,700,000 
  investments and other assets                                                                                
  unconsolidated affiliates7,800,000 6,800,000 6,500,000 6,500,000 5,400,000 5,400,000 5,300,000 5,200,000 3,800,000 2,200,000 1,600,000 1,600,000 800,000 800,000 800,000     900,000 1,400,000 1,300,000 1,300,000 2,200,000 2,300,000 2,100,000 2,100,000 2,600,000 4,200,000 5,000,000 5,500,000 5,600,000 6,000,000 6,500,000 6,600,000 6,500,000 6,700,000 6,700,000 6,900,000 6,700,000 452,300,000 447,900,000 452,600,000 443,500,000 437,100,000 407,100,000 373,700,000 327,800,000 279,400,000 260,800,000 243,300,000 215,700,000 211,500,000 204,800,000 204,700,000 200,200,000 197,200,000 202,600,000 200,900,000 141,800,000 166,800,000 165,800,000 146,400,000 114,100,000 86,800,000 70,500,000 76,000,000 74,400,000 59,100,000 94,500,000 66,100,000 59,600,000 70,900,000 80,700,000 72,500,000 75,000,000 70,400,000 67,100,000 97,800,000 108,100,000 
  available-for-sale debt securities144,900,000 81,200,000 86,700,000 137,900,000 145,500,000 150,100,000 159,100,000 161,900,000 154,900,000 150,400,000 151,600,000 157,800,000 149,800,000 156,700,000 171,800,000 168,900,000 166,300,000 167,900,000 170,900,000 161,800,000 155,200,000 144,600,000                                                           
  other investments107,000,000 84,600,000 85,500,000 89,000,000 84,900,000 86,800,000 82,700,000 76,400,000 78,500,000 74,300,000 71,000,000 68,800,000 73,500,000 82,400,000 87,100,000 84,400,000 85,200,000 81,500,000 81,100,000 75,300,000 72,600,000 66,100,000 228,900,000 217,500,000 215,300,000 208,500,000 204,000,000 214,500,000 199,600,000 201,300,000 204,100,000 207,700,000 195,100,000 194,100,000 193,300,000 200,500,000 190,200,000 194,800,000 187,700,000 195,800,000 200,700,000 208,700,000 210,400,000 211,700,000 201,900,000 203,100,000 204,000,000 201,600,000 189,100,000 190,400,000 194,400,000 196,000,000 156,800,000 156,500,000 150,900,000 164,300,000 150,800,000 136,300,000 139,700,000 128,000,000 129,100,000 129,200,000 111,600,000 115,700,000 117,900,000 119,800,000 110,800,000 113,400,000 119,800,000 106,700,000 112,300,000 116,100,000 118,200,000 100,100,000 101,400,000 114,200,000 115,200,000 116,900,000 82,800,000 72,500,000 
  total investments and other assets259,700,000 172,600,000 178,700,000 233,400,000 235,800,000 242,300,000 247,100,000 243,500,000 237,200,000 226,900,000 224,200,000 228,200,000 224,100,000 239,900,000 259,700,000 253,300,000 251,500,000 249,400,000 252,000,000 238,000,000 229,200,000 212,000,000 230,200,000 219,700,000 217,600,000 210,600,000 206,100,000 217,100,000 203,800,000 206,300,000 209,600,000 213,300,000 201,100,000 200,600,000 199,900,000 207,000,000 196,900,000 201,500,000 194,600,000 202,500,000 653,000,000 656,600,000 663,000,000 655,200,000 639,000,000 610,200,000 577,700,000 529,400,000 468,500,000 451,200,000 437,700,000 411,900,000 368,500,000 361,500,000 355,800,000 366,800,000 350,300,000 341,200,000 348,500,000 278,600,000 308,800,000 313,700,000 438,300,000 276,400,000 250,500,000 485,700,000 486,000,000 724,100,000 229,100,000 246,400,000 214,900,000 218,700,000     220,300,000 218,800,000   
  current assets                                                                                
  cash and cash equivalents335,400,000 259,400,000 156,600,000 126,200,000 101,200,000 102,200,000 2,245,400,000 56,000,000 151,300,000 106,400,000 40,800,000 35,800,000 77,800,000 114,500,000 84,200,000 38,500,000 77,500,000 89,100,000 116,500,000 58,600,000 142,200,000 203,800,000 139,300,000 28,000,000 23,700,000 151,000,000 112,800,000 41,800,000 68,200,000 35,000,000 29,000,000 19,300,000 17,900,000 28,400,000 26,400,000 16,100,000 15,700,000 23,700,000 15,500,000 31,700,000 496,600,000 42,000,000 25,400,000 17,700,000 18,000,000 38,000,000 26,800,000 14,900,000 44,500,000 101,400,000 36,300,000 12,300,000 52,800,000 38,500,000 11,500,000 22,200,000 59,900,000 62,500,000 9,200,000 7,400,000 110,600,000 16,400,000 248,900,000 135,200,000 20,600,000 25,100,000 45,900,000 77,400,000 17,700,000 23,000,000 102,200,000 33,100,000 22,800,000 57,900,000 83,400,000 69,400,000 932,500,000 258,200,000 588,000,000 30,100,000 
  restricted cash30,200,000 44,300,000 42,000,000 32,600,000 34,700,000 38,300,000 35,700,000 50,600,000 39,800,000 41,900,000 34,600,000 42,800,000 21,700,000 15,900,000 10,700,000 17,800,000 12,900,000 7,600,000 9,100,000 9,000,000 11,400,000 9,200,000 9,100,000 9,000,000 8,700,000 9,800,000 8,300,000 12,000,000 12,900,000 9,700,000 9,400,000 9,000,000 14,900,000 10,800,000 9,600,000 13,800,000 12,300,000 19,400,000 29,700,000 27,900,000 25,200,000 21,600,000 24,900,000 16,000,000 9,800,000 10,900,000 8,000,000 18,300,000 29,300,000 23,100,000 46,800,000 65,100,000 85,000,000 149,700,000 160,600,000 180,100,000 154,600,000 164,900,000 202,900,000 212,700,000 220,800,000 174,700,000 64,200,000 316,800,000 286,600,000 243,900,000 1,300,000 3,800,000 96,000,000 66,900,000 61,200,000 142,500,000 203,000,000 71,700,000 57,900,000 33,900,000 1,800,000 31,800,000 30,100,000 56,300,000 
  accounts receivable805,900,000 1,135,300,000 987,900,000 589,700,000 650,200,000 877,200,000 884,900,000 585,100,000 631,400,000 954,200,000 1,065,800,000 605,900,000 740,700,000 989,600,000 849,100,000 555,100,000 605,300,000 848,400,000 843,600,000 560,700,000 577,100,000 736,800,000 856,900,000 539,300,000 870,200,000 1,132,100,000 1,058,500,000 500,400,000 584,800,000 973,800,000 898,900,000 480,000,000 545,200,000 813,800,000 847,000,000 471,000,000 474,100,000 647,900,000 660,000,000 500,500,000 672,700,000 1,152,000,000 1,070,100,000 639,300,000 824,000,000 1,271,200,000 1,005,800,000 591,000,000 716,500,000 1,070,300,000 907,300,000 526,200,000 553,300,000 730,300,000 854,800,000 512,500,000 638,300,000 1,063,200,000 1,079,300,000 568,900,000 949,900,000 808,600,000 544,700,000 910,700,000 1,142,500,000 586,800,000 737,000,000 1,086,200,000 571,500,000 681,900,000 954,000,000 866,300,000 478,300,000 472,100,000 1,161,800,000 1,254,600,000 438,600,000 474,300,000 610,000,000 536,700,000 
  allowance for credit losses-27,300,000 -29,600,000 -23,700,000 -17,700,000 -26,200,000 -31,600,000 -22,900,000 -15,500,000 -27,800,000 -31,400,000 -23,900,000 -19,200,000 -26,100,000 -28,500,000 -23,500,000 -28,300,000 -41,600,000 -53,900,000 -52,300,000 -39,300,000 -31,400,000 -20,300,000                                                           
  gas storage148,200,000 42,800,000 179,600,000 189,300,000 133,100,000 70,100,000 265,800,000                                                                          
  materials and supplies, at average cost187,700,000 183,000,000 173,300,000 167,100,000 180,800,000 187,200,000 172,100,000 183,700,000 180,100,000 172,600,000 151,400,000 141,400,000 142,900,000 146,900,000 139,100,000 137,100,000 143,500,000 145,600,000 141,500,000 127,000,000 131,800,000 130,900,000 120,200,000 115,100,000 111,900,000 107,300,000 101,000,000 97,700,000 99,900,000 104,300,000 105,900,000 102,300,000 96,700,000 97,500,000 101,700,000 100,100,000 102,600,000 94,800,000 86,800,000 84,200,000 112,400,000 109,000,000 106,000,000 106,400,000 106,000,000 104,800,000 101,200,000 99,900,000 114,900,000 111,400,000 97,400,000 99,700,000 99,500,000 89,800,000 87,600,000 87,000,000 87,000,000 84,400,000 83,800,000 99,400,000 98,500,000 102,300,000 98,400,000 96,300,000 95,100,000 83,500,000 82,100,000 79,400,000 91,900,000 87,600,000 89,700,000 89,000,000 85,300,000 84,900,000 73,700,000 72,000,000 71,100,000 73,600,000 72,500,000 70,800,000 
  electric production fuel, at average cost32,100,000 35,500,000 36,200,000 34,900,000 59,300,000 66,300,000 65,300,000 60,000,000 68,300,000 64,900,000 68,800,000 52,400,000 41,200,000 41,500,000 32,200,000 23,200,000 38,600,000 52,500,000 68,400,000 66,200,000 67,600,000 63,200,000 53,600,000 38,700,000 27,400,000 33,300,000 34,700,000 49,000,000 53,800,000 69,100,000 80,100,000 84,000,000 102,200,000 98,500,000 112,800,000 110,000,000 113,100,000 110,800,000 106,300,000 81,100,000 96,500,000 75,500,000 64,800,000 48,200,000 41,500,000 22,900,000 44,600,000 39,800,000 38,800,000 59,000,000 71,700,000 54,800,000 75,700,000 83,300,000 50,900,000 41,300,000 44,900,000 51,000,000 46,000,000 52,900,000 52,400,000 59,900,000 81,200,000 76,000,000 63,800,000 48,500,000 48,300,000 59,900,000 56,700,000 57,300,000 62,300,000 63,900,000 53,200,000 48,300,000 44,800,000 24,900,000 27,600,000 32,700,000 31,200,000 29,200,000 
  exchange gas receivable33,000,000 70,200,000 45,700,000 22,500,000 13,000,000 43,200,000 66,000,000 37,800,000 43,100,000 92,100,000 128,100,000 184,700,000 134,600,000 98,600,000 99,600,000 59,100,000 31,700,000 53,700,000 34,100,000 24,400,000 17,900,000 39,000,000 48,500,000 30,300,000 41,500,000 72,100,000 88,400,000 37,300,000 29,600,000 53,600,000 45,800,000 42,900,000 35,100,000 18,800,000 5,400,000 16,900,000 16,200,000 26,400,000 21,000,000 19,700,000 57,100,000 77,000,000 63,100,000 80,900,000 135,700,000 161,400,000 70,600,000 84,300,000 81,100,000 71,100,000 51,500,000 30,900,000 42,700,000 76,400,000 64,900,000 92,700,000 118,200,000 65,500,000 62,700,000 109,100,000 71,300,000 72,500,000 163,700,000 257,400,000 393,800,000 407,300,000 464,200,000 389,100,000 223,700,000 385,200,000 274,000,000 252,300,000 366,300,000 780,600,000 516,700,000 169,800,000 208,200,000 195,500,000 182,400,000 169,600,000 
  regulatory assets287,100,000 268,000,000 319,900,000 329,700,000 278,400,000 260,400,000 214,300,000 217,800,000 200,300,000 237,600,000 233,200,000 245,700,000 179,700,000 154,700,000 206,200,000 198,500,000 180,100,000 188,900,000 135,700,000 132,600,000 145,700,000 164,300,000 225,700,000 237,600,000 212,200,000 190,900,000 235,400,000 221,000,000 174,600,000 160,900,000 176,300,000 203,900,000 183,200,000 184,800,000 248,700,000 262,900,000 236,800,000 226,100,000 172,100,000 183,700,000 175,500,000 159,500,000 193,500,000 200,100,000 188,100,000 159,100,000 142,800,000 152,500,000 145,500,000 141,700,000 162,800,000 190,600,000 192,900,000 186,200,000 169,700,000 142,400,000 121,900,000 112,600,000 151,800,000 168,200,000 169,600,000 238,300,000 286,300,000 285,800,000 314,900,000 306,400,000 200,300,000 176,200,000 252,100,000 232,000,000 210,000,000 272,700,000 290,500,000 233,200,000 213,100,000 195,000,000 179,400,000 166,100,000 143,800,000 136,200,000 
  prepayments143,500,000 138,200,000 138,500,000                                                                              
  other current assets23,000,000 37,500,000 24,200,000                                                                              
  total current assets1,998,800,000 2,184,600,000 2,080,200,000 1,616,000,000 1,943,800,000 2,060,200,000 4,499,400,000 1,815,400,000 1,856,900,000 2,336,500,000 2,584,300,000 2,228,600,000 1,911,700,000 1,871,900,000 1,920,800,000 1,471,400,000 1,384,200,000 1,593,500,000 1,659,400,000 2,820,800,000 2,859,600,000 3,225,400,000 1,853,900,000 1,378,300,000 1,578,000,000 1,915,800,000 2,055,400,000 1,369,100,000 1,315,700,000 1,633,800,000 1,763,300,000 1,332,400,000 1,280,800,000 1,471,200,000 1,762,100,000 1,378,500,000 1,259,600,000 1,395,400,000 1,577,200,000 1,637,800,000 2,335,700,000 2,261,000,000 2,466,500,000 2,011,600,000 2,054,500,000 2,320,100,000 2,159,200,000 1,745,500,000 1,707,600,000 2,031,800,000 2,352,400,000 1,838,700,000 1,751,600,000 1,970,300,000 2,248,200,000 1,860,500,000 1,745,100,000 1,985,200,000 2,448,900,000 1,893,400,000 2,197,200,000 2,223,600,000 2,436,700,000 2,632,400,000 3,410,800,000 3,126,000,000 2,680,400,000 2,521,500,000 2,268,800,000 2,149,600,000 2,261,300,000 2,782,900,000 2,522,800,000 2,289,000,000 2,743,100,000 3,060,700,000 3,213,100,000 1,730,500,000 2,404,300,000 2,285,600,000 
  other assets                                                                                
  goodwill1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,485,900,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 1,690,700,000 3,666,200,000 3,666,200,000 3,666,200,000 3,666,200,000 3,666,200,000 3,666,200,000 3,666,200,000 3,666,200,000 3,666,200,000 3,666,200,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,677,300,000 3,687,200,000 3,687,200,000 
  deferred charges and other654,600,000 609,800,000 432,000,000 403,100,000 397,800,000 371,900,000 324,000,000 293,900,000 288,300,000 257,600,000 252,000,000 402,400,000 371,600,000 370,800,000 322,700,000 291,500,000 260,000,000 237,700,000 228,900,000 162,200,000 163,100,000 160,200,000 163,700,000 157,000,000 146,800,000 134,000,000 86,500,000 117,200,000 104,900,000 98,000,000 82,000,000 90,400,000 84,200,000 86,900,000 91,800,000 72,100,000 66,600,000 65,000,000 65,000,000 70,300,000 111,600,000 86,600,000 92,400,000 82,300,000 85,000,000 85,300,000 87,300,000 89,000,000 88,100,000 94,100,000 94,400,000 94,500,000 143,100,000 150,200,000 130,900,000 134,600,000 120,700,000 140,600,000 132,700,000 125,400,000 140,200,000 152,100,000 125,600,000 117,400,000 123,500,000 117,800,000 114,200,000 120,800,000 154,300,000 163,600,000 162,100,000 170,200,000 188,000,000 191,700,000 178,400,000 167,400,000 181,400,000 185,900,000 185,600,000 189,500,000 
  total other assets4,318,900,000 4,258,000,000 4,075,300,000 4,097,300,000 4,105,400,000 4,089,500,000 4,055,800,000 4,057,300,000 4,074,400,000 4,062,700,000 4,085,500,000 4,128,600,000 4,166,300,000 4,133,000,000 4,094,600,000 3,532,800,000 3,523,000,000 3,514,900,000 3,509,600,000 3,563,700,000 3,575,300,000 3,568,100,000 3,663,500,000 4,053,400,000 4,044,800,000 4,022,100,000 4,000,000,000 3,938,800,000 3,940,500,000 3,801,800,000 3,629,300,000 3,681,700,000 3,671,500,000 3,675,200,000 3,661,900,000 3,627,900,000 3,604,800,000 3,607,300,000 3,609,200,000 3,524,900,000 5,709,900,000 5,697,900,000 5,719,700,000 5,456,800,000 5,475,500,000 5,519,300,000 5,551,900,000 5,896,800,000 5,971,600,000 6,034,500,000 6,138,700,000 6,045,300,000 6,140,300,000 6,212,100,000 6,304,200,000 5,966,100,000 5,955,900,000 6,011,800,000 6,044,400,000 6,076,100,000 6,148,400,000 6,050,500,000 5,805,200,000 5,964,500,000 5,982,800,000 5,224,300,000 5,323,700,000 5,265,100,000 5,282,400,000 5,303,700,000 5,338,100,000 5,460,400,000 5,006,400,000 5,059,600,000 5,097,700,000 5,119,700,000 5,122,900,000 5,135,500,000 5,120,500,000 5,113,700,000 
  total assets34,028,900,000 33,105,100,000 31,788,100,000 30,828,100,000 29,897,600,000 29,338,100,000 31,077,200,000 27,828,200,000 27,343,700,000 26,853,700,000 26,736,600,000 25,576,400,000 24,813,800,000 24,365,500,000 24,156,900,000 22,778,600,000 22,313,800,000 22,194,500,000 22,040,500,000 22,701,500,000 22,436,500,000 22,592,700,000 22,659,800,000 22,132,300,000 21,974,200,000 21,889,900,000 21,804,000,000 20,699,400,000 20,307,900,000 20,098,500,000 19,961,700,000 19,269,500,000 18,822,700,000 18,635,900,000 18,691,900,000 18,067,200,000 17,617,200,000 17,471,400,000 17,492,500,000 17,055,900,000 25,606,900,000 24,898,900,000 24,866,300,000 23,710,100,000 23,257,800,000 23,107,300,000 22,653,900,000 22,084,100,000 21,621,600,000 21,636,400,000 21,844,700,000 20,838,600,000 20,409,400,000 20,445,900,000 20,708,300,000 19,742,100,000 19,346,300,000 19,478,800,000 19,938,800,000 19,048,100,000 19,351,600,000 19,271,700,000 19,223,300,000 19,350,000,000 20,032,200,000 19,097,800,000 18,616,200,000 18,186,700,000 17,651,400,000 17,504,600,000 17,555,200,000 18,156,500,000 17,316,700,000 17,088,700,000 17,561,600,000 17,958,500,000 17,982,100,000 16,458,900,000 17,103,700,000 16,988,000,000 
  capitalization and liabilities                                                                                
  capitalization                                                                                
  stockholders’ equity                                                                                
  common stock - 0.01 par value,750,000,000 shares authorized; 470,784,423 and 469,822,472 shares outstanding, respectively4,700,000                                                                                
  treasury stock-99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,900,000 -99,500,000 -95,900,000 -94,600,000 -94,600,000 -93,100,000 -88,700,000 -87,400,000 -87,200,000 -86,700,000 -79,300,000 -79,200,000 -79,100,000 -79,000,000 -58,900,000 -58,900,000 -58,800,000 -58,600,000 -48,600,000 -48,600,000 -48,500,000 -48,100,000 -40,500,000 -40,500,000 -40,500,000 -40,400,000 -30,500,000  -30,400,000 -30,200,000 -27,400,000 -27,400,000 -27,400,000 -25,900,000  -24,100,000 -23,300,000 -23,500,000 -23,400,000 -23,300,000 -23,300,000 -23,300,000 -22,700,000  -21,100,000        
  additional paid-in capital9,538,000,000 9,522,600,000 9,521,500,000 9,404,700,000 8,894,200,000 8,886,800,000 8,879,500,000 7,393,000,000 7,383,100,000 7,372,900,000 7,375,300,000 7,224,800,000 7,218,600,000 7,208,900,000 7,204,300,000 6,735,300,000 6,728,000,000 6,892,900,000 6,890,100,000 6,684,200,000 6,676,500,000 6,671,500,000 6,666,200,000 6,426,500,000 6,417,100,000 6,406,500,000 6,403,500,000 6,161,000,000 6,151,200,000 5,540,500,000 5,529,100,000 5,518,500,000 5,225,300,000 5,174,700,000 5,153,900,000 5,135,600,000 5,118,300,000 5,102,500,000 5,078,000,000 5,078,600,000 5,065,100,000 5,048,400,000 4,787,600,000 4,764,700,000 4,734,700,000 4,715,600,000 4,690,100,000 4,672,900,000 4,646,000,000 4,627,500,000 4,597,600,000 4,579,300,000 4,221,000,000 4,198,900,000 4,167,700,000  4,132,900,000 4,120,100,000 4,103,900,000 4,080,400,000 4,068,500,000 4,057,600,000  4,023,000,000 4,020,300,000 4,017,800,000 4,015,400,000 4,013,200,000 4,008,900,000 4,007,600,000 4,001,100,000          
  retained deficit-532,100,000 -501,400,000 -711,700,000 -934,900,000 -896,200,000 -861,700,000 -967,000,000 -1,200,600,000 -1,173,800,000 -1,114,800,000 -1,213,600,000 -1,458,100,000 -1,408,900,000 -1,372,300,000 -1,580,900,000 -1,746,800,000 -1,704,100,000 -1,669,800,000 -1,765,200,000 -1,849,600,000 -1,576,700,000 -1,483,400,000 -1,370,800,000 -1,231,600,000 -1,144,000,000 -1,358,000,000 -1,399,300,000 -1,387,500,000 -965,500,000 -919,200,000 -1,073,100,000 -1,020,600,000 -975,600,000 -874,200,000 -972,200,000 -1,060,900,000 -1,067,400,000 -1,042,900,000                                           
  accumulated other comprehensive loss-28,200,000 -29,200,000 -30,400,000 -29,600,000 -33,600,000 -33,800,000 -33,600,000 -36,900,000 -35,800,000 -34,700,000 -37,100,000 -23,500,000 -35,800,000 -85,400,000 -126,800,000 -117,400,000 -123,600,000 -75,500,000 -156,700,000 -193,600,000 -221,900,000 -230,600,000 -92,600,000 -130,300,000 -80,800,000 -52,800,000 -37,200,000  -20,900,000 -19,000,000 -43,400,000 -43,700,000 -35,600,000 -19,600,000 -25,100,000 -179,000,000 -156,300,000 -103,800,000 -35,100,000 -19,600,000 -44,400,000 -46,600,000 -50,600,000 -41,600,000 -41,400,000 -42,500,000 -43,600,000 -60,400,000 -62,000,000 -62,300,000 -65,500,000 -56,800,000 -59,000,000 -60,900,000 -59,700,000  -54,500,000 -56,700,000 -57,900,000 -60,400,000 -50,400,000 -45,900,000  -187,200,000         -106,300,000        
  total nisource stockholders’ equity8,882,500,000 8,896,800,000  8,345,000,000 7,869,000,000 7,895,900,000  7,212,400,000 7,230,400,000 7,674,200,000  7,193,900,000 7,224,600,000 7,201,900,000  6,494,900,000 6,523,100,000 5,931,600,000                                                               
  noncontrolling interest in consolidated subsidiaries2,114,400,000 2,049,200,000 1,984,100,000 1,983,800,000 1,950,600,000 1,899,000,000 1,866,700,000 556,900,000 341,000,000 329,500,000 326,400,000 311,800,000 315,800,000 329,500,000 325,600,000 89,200,000 90,400,000 94,100,000 85,600,000                      950,000,000 946,200,000                                       
  total stockholders’ equity10,996,900,000 10,946,000,000 10,668,300,000    10,136,300,000    7,901,800,000    7,272,900,000    5,837,800,000 5,424,900,000 5,661,800,000 5,741,400,000 5,986,700,000 5,848,500,000 5,976,200,000 5,779,600,000 5,750,900,000 5,073,700,000 5,463,000,000                                                    
  long-term debt, excluding amounts due within one year14,473,800,000 12,833,100,000 12,074,500,000 12,086,300,000 12,809,600,000 11,724,600,000 11,055,500,000 11,011,300,000 11,002,800,000 10,264,700,000 9,523,600,000 9,521,200,000 9,520,200,000 9,179,800,000 9,183,400,000 9,188,200,000 9,201,600,000 9,202,300,000 9,219,800,000 9,208,900,000 8,810,200,000 7,817,900,000 7,856,200,000 7,853,800,000 7,109,700,000 7,110,100,000 7,105,400,000 7,094,500,000 7,092,500,000 7,286,800,000 7,512,200,000 7,518,600,000 6,777,400,000 5,590,700,000 6,058,200,000 6,096,200,000 5,857,200,000 5,905,500,000 5,948,500,000 6,133,500,000 8,881,100,000 7,957,900,000 8,155,900,000 8,397,400,000 7,640,600,000 7,638,500,000 7,593,200,000 7,089,100,000 7,616,700,000 6,803,900,000 6,819,100,000 6,819,700,000 6,806,900,000 5,834,400,000 6,267,100,000  6,340,000,000 5,927,600,000 5,936,100,000 5,977,300,000 5,963,900,000 5,965,100,000  6,451,900,000 5,943,900,000 6,323,300,000 6,059,900,000 5,383,000,000 5,923,400,000 5,124,300,000 5,153,100,000  5,173,400,000 5,163,500,000 5,229,600,000 5,271,200,000  4,807,300,000 4,809,700,000 4,835,900,000 
  total capitalization25,470,700,000 23,779,100,000 22,742,800,000 22,415,100,000 22,629,200,000 21,519,500,000 21,191,800,000 18,780,600,000 18,574,200,000 18,268,400,000 17,425,400,000 17,026,900,000 17,060,600,000 16,711,200,000 16,456,300,000 15,772,300,000 15,815,100,000 15,228,000,000 15,057,600,000 14,633,800,000 14,472,000,000 13,559,300,000 13,842,900,000 13,702,300,000 13,085,900,000 12,889,700,000 12,856,300,000 12,168,200,000 12,555,500,000 11,793,000,000 11,832,300,000 11,881,600,000 10,900,200,000 9,781,800,000 10,129,400,000 9,907,800,000 9,667,800,000 9,777,800,000 9,792,000,000 9,933,800,000 16,337,000,000 15,427,600,000 14,331,200,000 14,404,700,000 13,668,900,000 13,650,600,000 13,479,800,000 12,790,000,000 13,319,400,000 12,494,600,000 12,373,400,000 12,230,500,000 11,912,200,000 10,914,900,000 11,264,400,000  11,343,400,000 10,941,900,000 10,859,300,000 10,872,200,000 10,892,700,000 10,819,200,000  11,189,600,000 10,672,700,000 10,994,100,000 10,870,800,000 10,447,200,000 10,927,600,000 10,198,800,000 10,280,400,000  9,978,800,000 10,035,200,000 10,235,200,000 10,285,300,000  9,783,300,000 9,833,800,000 9,704,100,000 
  current liabilities                                                                                
  current portion of long-term debt1,282,200,000 1,281,000,000 1,281,200,000 1,271,200,000 23,400,000 24,000,000 23,800,000 26,800,000 29,400,000 30,300,000 30,000,000 28,600,000 37,300,000 57,900,000 58,100,000 55,700,000 45,300,000 44,400,000 23,300,000 21,400,000 15,600,000 7,900,000 13,400,000 10,900,000 10,700,000 51,400,000 50,000,000 48,600,000 597,700,000 262,700,000 284,300,000 289,800,000 561,200,000 809,300,000 363,100,000 582,600,000 311,900,000 263,800,000 433,700,000 442,600,000 442,600,000 462,700,000 266,600,000 18,700,000 530,000,000 530,500,000 542,100,000 541,200,000 70,700,000 89,300,000 507,200,000 823,300,000 766,900,000 750,800,000 327,300,000  30,000,000 36,400,000 34,200,000 718,800,000 723,100,000 719,300,000  436,000,000 469,300,000 19,900,000 43,100,000 89,300,000 60,900,000 56,700,000 90,100,000  461,800,000 441,800,000 442,700,000 440,700,000  1,260,100,000 1,299,600,000 1,299,900,000 
  short-term borrowings 771,000,000 604,600,000 257,000,000 644,000,000 1,222,300,000 3,048,600,000 2,219,900,000 1,589,900,000 1,281,600,000 1,761,900,000 1,274,200,000 555,000,000 520,000,000 560,000,000 380,000,000  520,000,000 503,000,000 1,388,200,000 1,163,500,000 2,046,400,000 1,773,200,000 1,615,100,000 2,081,000,000 2,080,000,000 1,977,200,000 1,611,000,000 600,000,000 1,567,300,000 1,205,700,000 843,200,000 901,300,000 1,514,200,000 1,488,000,000 1,059,000,000 1,100,700,000 845,300,000 567,400,000 107,200,000 161,800,000 314,000,000 1,576,900,000 1,311,100,000 1,101,100,000 812,500,000 698,700,000 820,800,000 377,700,000 1,131,200,000 776,900,000 225,300,000 327,600,000 1,264,200,000 1,359,400,000  870,400,000 1,263,000,000 1,382,500,000 212,800,000 370,700,000 103,000,000   1,163,500,000 1,263,000,000 506,000,000 624,700,000 673,000,000 1,021,500,000 620,000,000  861,000,000 420,000,000 379,200,000 898,000,000    307,600,000 
  accounts payable683,900,000 726,300,000 863,100,000 614,600,000 584,000,000 612,500,000 749,400,000 648,200,000 718,400,000 642,200,000 899,500,000 666,500,000 650,300,000 628,500,000 697,800,000 487,200,000 480,400,000 554,900,000 589,000,000 410,300,000 402,500,000 505,600,000 666,000,000 494,900,000 552,200,000 675,200,000 883,800,000 433,700,000 455,000,000 497,300,000 625,600,000 447,400,000 451,100,000 461,600,000 539,400,000 352,200,000 371,200,000 392,700,000 433,400,000 349,200,000 429,200,000 563,900,000 670,600,000 427,700,000 459,600,000 714,400,000 619,000,000 369,600,000 393,000,000 527,400,000 538,900,000 300,100,000 292,100,000 380,700,000 434,800,000  316,200,000 429,600,000 581,800,000 278,900,000 407,100,000 502,100,000  531,600,000 693,300,000 498,000,000 665,200,000 755,900,000 449,700,000 546,300,000 659,500,000  461,000,000 329,800,000 538,700,000 866,700,000  390,900,000 502,300,000 648,400,000 
  dividends payable - common stock135,100,000 134,400,000  125,300,000 120,000,000 119,000,000  103,800,000 103,400,000 103,400,000  95,600,000 95,400,000 95,300,000  86,400,000 86,300,000 86,300,000  80,500,000 80,400,000 80,400,000  74,700,000 74,600,000 74,600,000  70,800,000                                                     
  customer deposits and credits159,900,000 143,200,000 268,800,000 261,600,000 187,700,000 189,500,000 294,400,000 286,600,000 207,600,000 225,500,000 324,700,000 314,500,000 184,700,000 155,200,000 237,900,000 232,500,000 148,100,000 146,700,000 243,300,000 229,200,000 163,100,000 163,200,000 256,400,000 242,800,000 159,100,000 152,600,000 238,900,000 238,400,000 158,000,000 154,700,000 262,600,000 253,100,000 168,600,000 166,300,000 264,100,000 255,200,000 186,700,000 212,800,000 316,300,000 255,400,000 206,900,000 172,600,000 294,300,000 257,100,000 241,700,000 239,400,000 262,600,000 249,200,000 164,700,000 167,600,000 269,600,000 263,600,000 201,800,000 215,100,000 313,600,000  183,100,000 181,600,000 318,100,000 196,500,000 176,500,000 301,200,000                   
  taxes accrued172,400,000 215,900,000 173,400,000 134,700,000 163,700,000 169,500,000 166,200,000 176,100,000 208,700,000 268,700,000 246,200,000 189,700,000 232,300,000 313,500,000 277,100,000 199,600,000 232,000,000 301,500,000 244,100,000 147,100,000 195,700,000 223,800,000 231,600,000 157,800,000 167,300,000 232,800,000 222,700,000 150,000,000 165,800,000 212,800,000 208,100,000 148,400,000 152,200,000 216,600,000 195,400,000 130,900,000 140,900,000 203,100,000 183,500,000 137,000,000 221,500,000 287,100,000 266,700,000 189,300,000 216,100,000 278,600,000 254,800,000 181,300,000 202,100,000 258,200,000 235,500,000 172,000,000 185,500,000 237,300,000 220,900,000  179,500,000 244,400,000 221,100,000 227,800,000 296,800,000 212,900,000  259,400,000 206,500,000 145,100,000 223,700,000 327,100,000 168,100,000 241,300,000 335,000,000  137,200,000 238,800,000 381,000,000 217,500,000  244,200,000 376,800,000 160,900,000 
  interest accrued177,800,000 142,300,000 157,000,000 147,400,000 146,400,000 148,600,000 136,100,000 150,400,000 125,000,000 139,200,000 138,400,000 124,100,000 124,400,000 94,300,000 105,500,000 94,100,000 105,200,000 94,600,000 104,700,000 95,400,000 106,000,000 95,100,000 99,400,000 95,600,000 90,400,000 93,700,000 90,700,000 108,000,000 103,300,000 93,900,000 112,300,000 89,200,000 104,900,000 67,500,000 120,300,000 71,100,000 121,400,000 72,200,000 129,000,000 77,500,000 141,600,000 81,400,000 140,700,000 81,700,000 142,000,000 75,300,000 136,400,000 71,600,000 125,200,000 68,200,000 133,700,000 82,900,000 116,600,000 70,200,000 111,900,000  114,400,000 61,200,000 114,400,000 130,600,000 84,100,000 125,400,000  96,700,000 120,100,000 101,800,000 99,900,000 90,300,000 106,800,000 84,500,000 101,200,000  111,500,000 90,100,000 105,300,000 86,200,000  79,700,000 146,700,000 84,100,000 
  asset retirement obligations58,200,000 50,700,000 84,600,000 74,900,000 69,600,000 78,000,000 72,500,000 57,100,000 50,700,000 48,100,000 478,100,000 458,700,000 464,100,000 472,000,000 469,700,000 427,900,000 437,000,000 479,700,000 477,100,000 424,800,000 447,100,000 435,900,000 416,900,000 373,100,000 367,600,000 358,400,000 352,000,000 346,900,000 334,600,000 269,900,000 268,700,000 268,500,000 267,200,000 261,300,000 262,600,000 272,300,000 257,400,000 253,100,000 254,000,000 181,200,000 204,700,000 160,900,000 159,400,000 175,200,000 178,000,000 176,500,000 174,400,000 175,500,000 167,100,000 165,300,000 160,400,000 152,000,000 149,700,000 148,400,000 146,400,000  138,900,000 140,100,000 138,800,000 136,800,000 139,700,000 138,200,000  125,700,000 126,000,000 128,400,000 128,200,000 129,600,000 136,900,000 135,100,000 133,300,000  125,300,000 123,500,000 121,600,000 119,800,000     
  exchange gas payable80,700,000 59,100,000 91,800,000 56,100,000 34,700,000 17,100,000 50,500,000 44,100,000 33,000,000 19,600,000 147,600,000 170,900,000 91,200,000 37,800,000 107,700,000 73,200,000 34,900,000 25,500,000 48,500,000 46,300,000 27,700,000 18,500,000 59,700,000 54,800,000 42,300,000 15,500,000 85,500,000 58,200,000 36,900,000 11,500,000 59,600,000 68,000,000 46,600,000 23,300,000 83,700,000 58,200,000 37,700,000 25,800,000 62,300,000 66,800,000 63,900,000 65,800,000 136,200,000 143,100,000 139,200,000 143,100,000 186,400,000 207,300,000 126,300,000 76,000,000 146,200,000 124,700,000 101,400,000 66,300,000 168,200,000  155,400,000 139,400,000 266,100,000 207,100,000 151,400,000 222,200,000  339,000,000 555,500,000 649,700,000 687,000,000 571,300,000 393,900,000 500,500,000 361,700,000  465,100,000 854,300,000 660,100,000 425,200,000  254,000,000 237,000,000 325,100,000 
  regulatory liabilities194,900,000 233,500,000 150,500,000 151,700,000 193,400,000 237,600,000 278,600,000 320,200,000 362,000,000 359,100,000 236,800,000 288,900,000 300,400,000 229,100,000 137,400,000 173,200,000 154,000,000 169,600,000 161,300,000 156,000,000 184,900,000 177,900,000 160,200,000 103,000,000 150,500,000 152,100,000 140,900,000 81,900,000 121,500,000 97,300,000 58,700,000 55,100,000 83,700,000 131,600,000 116,700,000 107,200,000 142,500,000 176,800,000 83,300,000 120,200,000 136,100,000 102,000,000 62,400,000 79,900,000 88,700,000 79,100,000 60,200,000 75,500,000 80,000,000 106,500,000 171,600,000 171,100,000 93,300,000 99,900,000 112,000,000  83,500,000 87,400,000 92,900,000 83,600,000 51,700,000 43,800,000  40,200,000 40,400,000 51,800,000 113,100,000 70,400,000 79,300,000 41,500,000 42,600,000  42,300,000 35,600,000 37,300,000 46,300,000  29,100,000 40,500,000 30,200,000 
  accrued compensation and employee benefits161,300,000 141,500,000 268,200,000 239,300,000 174,000,000 136,000,000 227,600,000 183,300,000 151,700,000 124,500,000 167,500,000 150,500,000 142,900,000 130,500,000 182,700,000 178,400,000 149,800,000 131,200,000 141,800,000 141,700,000 120,300,000 129,400,000 156,300,000 145,700,000 134,300,000 111,000,000 149,700,000 153,400,000 135,800,000 115,200,000 195,400,000 167,000,000 143,700,000 107,000,000 161,400,000 136,000,000 124,700,000 102,800,000 136,400,000 125,900,000                                         
  other accruals305,900,000 343,000,000 170,200,000 151,700,000 167,100,000 170,900,000 217,400,000 170,800,000 503,200,000 298,100,000 360,700,000 588,200,000 592,900,000 313,100,000 382,000,000 266,900,000 262,800,000 164,700,000 113,600,000 119,100,000 140,500,000 180,900,000 144,100,000 120,700,000 86,200,000 79,500,000 58,800,000 54,500,000 75,600,000 109,500,000 90,800,000 119,200,000 78,700,000 76,200,000 82,700,000 67,500,000 68,200,000 103,100,000 114,700,000 121,700,000 313,800,000 317,100,000 378,100,000 408,600,000 347,400,000 323,800,000 327,600,000 308,700,000 283,800,000 269,700,000 309,700,000 232,700,000 219,800,000 239,700,000 301,000,000  230,000,000 249,200,000 336,400,000 244,200,000 257,500,000 310,300,000  289,300,000 487,400,000 381,700,000 314,000,000 429,700,000 417,800,000 405,900,000 696,100,000  391,300,000 319,300,000 499,500,000 549,100,000  341,700,000 597,100,000 478,400,000 
  total current liabilities3,412,300,000 4,241,900,000 4,113,400,000 3,485,500,000 2,508,000,000 3,125,000,000 5,265,100,000 4,395,400,000 4,091,200,000 3,906,900,000 4,660,500,000 3,911,100,000 3,015,000,000 2,594,600,000 2,746,200,000 2,246,600,000 1,706,900,000 2,258,800,000 2,279,400,000 3,446,800,000 3,227,700,000 4,161,800,000 3,745,800,000 3,339,700,000 3,813,700,000 4,015,200,000 4,036,800,000 3,411,200,000 2,560,400,000 3,226,200,000 3,178,400,000 2,566,800,000 2,778,300,000 3,664,100,000 3,452,200,000 2,911,600,000 2,696,200,000 2,495,900,000 2,657,500,000 2,073,300,000 2,524,300,000 2,758,400,000 3,954,900,000 3,048,500,000 3,431,400,000 3,340,800,000 3,178,400,000 3,005,600,000 2,068,000,000 2,974,400,000 3,301,600,000 2,727,100,000 2,662,300,000 3,718,400,000 3,646,400,000  2,558,100,000 3,096,100,000 3,649,400,000 2,717,400,000 2,997,200,000 3,149,600,000  3,278,000,000 4,583,400,000 4,019,200,000 3,648,800,000 3,753,300,000 2,706,200,000 3,246,500,000 3,222,400,000  3,588,400,000 3,237,400,000 3,508,700,000 3,843,200,000  3,003,200,000 3,545,300,000 3,602,200,000 
  other liabilities                                                                                
  deferred income taxes2,387,200,000 2,353,900,000 2,281,600,000 2,206,700,000 2,198,200,000 2,159,500,000 2,080,400,000 2,011,400,000 1,986,000,000 1,950,100,000 1,854,500,000 1,803,700,000 1,830,900,000 1,789,800,000 1,659,400,000 1,620,800,000 1,587,500,000 1,573,600,000 1,470,600,000 1,439,500,000 1,477,400,000 1,451,300,000 1,485,300,000 1,466,600,000 1,472,900,000 1,391,600,000 1,330,500,000 1,291,700,000 1,396,700,000 1,384,800,000 1,292,900,000 2,619,400,000 2,617,000,000 2,644,300,000 2,528,000,000 2,384,200,000 2,413,300,000 2,426,900,000 2,365,300,000 227,100,000 303,800,000 277,200,000 272,100,000 231,700,000 3,471,900,000 3,392,300,000 3,277,800,000 3,133,500,000 3,062,700,000 2,980,100,000 2,953,300,000 2,758,500,000 2,730,500,000 2,650,700,000 2,541,900,000  2,369,100,000 2,340,200,000 2,209,700,000 2,074,300,000 2,053,300,000 2,018,200,000  1,606,200,000 1,549,800,000 1,540,700,000 1,522,200,000 1,494,500,000 1,549,400,000 1,537,600,000 1,544,900,000  1,485,100,000 1,497,600,000 1,542,700,000 1,591,900,000  1,624,600,000 1,695,700,000 1,665,900,000 
  accrued liability for postretirement and postemployment benefits200,500,000 204,000,000 207,500,000 238,400,000 241,800,000 244,800,000 250,100,000 236,000,000 237,000,000 239,600,000 245,500,000 277,200,000 280,500,000 285,300,000 292,500,000 308,800,000 323,300,000 328,900,000 336,100,000 344,400,000 351,300,000 359,400,000 373,200,000 365,500,000 372,100,000 377,300,000 389,100,000 300,900,000 311,700,000 323,400,000 337,100,000 397,300,000 688,100,000 700,000,000 713,400,000 738,200,000 746,100,000 4,900,000 4,900,000 5,200,000 5,900,000 5,900,000 5,900,000 6,200,000 6,200,000 6,200,000 6,200,000 6,100,000 6,100,000 6,100,000 6,100,000 26,600,000 26,600,000 26,600,000 26,600,000  23,300,000 23,300,000 23,300,000 7,600,000 7,600,000 23,600,000  6,400,000 6,400,000 4,900,000 4,900,000 4,900,000 4,800,000 4,700,000 4,700,000  59,400,000 61,000,000 61,100,000 61,100,000    85,500,000 
  other noncurrent liabilities and deferred credits344,400,000 336,700,000 313,000,000 311,800,000 308,300,000 297,700,000 298,600,000 291,500,000 294,600,000 298,500,000 296,800,000                                                                      
  total other liabilities5,145,900,000 5,084,100,000 4,931,900,000 4,927,500,000 4,760,400,000 4,693,600,000 4,620,300,000 4,652,200,000 4,678,300,000 4,678,400,000 4,650,700,000 4,638,400,000 4,738,200,000 5,059,700,000 4,954,400,000 4,759,700,000 4,791,800,000 4,707,700,000 4,703,500,000 4,620,900,000 4,736,800,000 4,871,600,000 5,071,100,000 5,090,300,000 5,074,600,000 4,985,000,000 4,910,900,000 5,120,000,000 5,192,000,000 5,079,300,000 4,951,000,000 4,821,100,000 5,144,200,000 5,190,000,000 5,110,300,000                                              
  commitments and contingencies                                                                                
  total capitalization and liabilities34,028,900,000 33,105,100,000 31,788,100,000 30,828,100,000 29,897,600,000 29,338,100,000 31,077,200,000 27,828,200,000 27,343,700,000 26,853,700,000 26,736,600,000 25,576,400,000 24,813,800,000 24,365,500,000 24,156,900,000 22,778,600,000 22,313,800,000 22,194,500,000 22,040,500,000 22,701,500,000 22,436,500,000 22,592,700,000 22,659,800,000 22,132,300,000 21,974,200,000 21,889,900,000 21,804,000,000 20,699,400,000 20,307,900,000 20,098,500,000 19,961,700,000 19,269,500,000 18,822,700,000 18,635,900,000 18,691,900,000 18,067,200,000 17,617,200,000 17,471,400,000 17,492,500,000 17,055,900,000 25,606,900,000 24,898,900,000 24,866,300,000 23,710,100,000 23,257,800,000 23,107,300,000 22,653,900,000 22,084,100,000 21,621,600,000 21,636,400,000 21,844,700,000 20,838,600,000 20,409,400,000 20,445,900,000 20,708,300,000  19,346,300,000 19,478,800,000 19,938,800,000 19,048,100,000 19,351,600,000 19,271,700,000  19,350,000,000 20,032,200,000 19,097,800,000 18,616,200,000 18,186,700,000 17,651,400,000 17,504,600,000 17,555,200,000  17,316,700,000 17,088,700,000 17,561,600,000 17,958,500,000  16,458,900,000 17,103,700,000 16,988,000,000 
  common stock - 0.01 par value,750,000,000 shares authorized; 470,618,280 and 469,822,472 shares outstanding, respectively 4,700,000                                                                               
  deposits to renewable generation asset developer    381,100,000 285,800,000 454,200,000 179,500,000 137,400,000 281,200,000 143,800,000                                                                      
  common stock - 0.01 par value, 750,000,000 shares authorized; 469,822,472 and 447,381,671 shares outstanding, respectively  4,700,000                                                                              
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 0 and 40,000 shares outstanding, respectively                                                                                
  total nisource stockholders' equity  8,684,200,000    8,269,600,000    7,575,400,000    6,947,300,000    5,752,200,000                                                              
  prepayments and other   141,700,000 138,200,000 161,100,000 118,600,000 162,600,000 218,700,000 278,200,000 210,000,000 332,800,000 291,700,000 263,900,000 104,800,000 159,300,000 187,400,000 109,300,000 86,000,000 112,600,000 142,600,000 182,800,000 149,700,000 85,400,000 103,100,000 144,200,000 129,500,000 89,700,000 109,100,000 155,500,000 132,800,000 65,800,000 91,300,000 139,100,000 130,600,000 64,100,000 89,800,000 133,500,000 107,500,000 75,900,000 133,200,000 187,300,000 169,500,000 103,600,000 320,900,000 321,100,000 330,600,000 246,100,000 224,400,000 228,100,000 357,200,000 280,800,000 274,200,000 277,400,000 261,800,000 119,700,000 100,400,000 119,700,000 120,800,000 118,600,000 136,700,000 125,500,000 180,300,000 291,000,000 249,100,000 228,900,000 173,900,000 103,500,000 66,200,000 61,700,000 87,200,000 111,700,000 70,300,000 70,500,000 99,300,000 109,300,000 86,400,000 101,700,000 84,700,000 96,200,000 
  common stock - 0.01 par value,750,000,000 shares authorized; 466,707,452 and 447,381,671 shares outstanding, respectively   4,700,000                                                                             
  total stockholders' equity   10,328,800,000 9,819,600,000 9,794,900,000          6,584,100,000 6,613,500,000 6,025,700,000                                                               
  common stock - 0.01 par value,750,000,000 shares authorized; 448,398,632 and 447,381,671 shares outstanding, respectively    4,500,000                                                                            
  common stock - 0.01 par value,750,000,000 shares authorized; 448,197,604 and 447,381,671 shares outstanding, respectively     4,500,000                                                                           
  common stock - 0.01 par value, 750,000,000 shares authorized; 447,381,671 and 412,142,602 shares outstanding, respectively      4,500,000                                                                          
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 40,000 and 1,302,500 shares outstanding, respectively      486,100,000                                                                          
  obligations to renewable generation asset developer         347,200,000 347,200,000                                                                      
  gas inventory       297,800,000 214,300,000 138,800,000 531,700,000 606,300,000 307,500,000 74,800,000 327,400,000 311,100,000 148,800,000 48,100,000 191,200,000 203,300,000 112,400,000 59,900,000 250,900,000 294,900,000 179,300,000 75,100,000 286,800,000 320,200,000 182,800,000 71,900,000 285,100,000 325,200,000 194,300,000 79,500,000 279,900,000 323,600,000 199,000,000 112,800,000 343,500,000 398,900,000 259,200,000 134,400,000 445,100,000 513,000,000 321,600,000 97,900,000 354,600,000 454,800,000 266,000,000 70,300,000 326,600,000 385,200,000 252,900,000 181,100,000 427,600,000 467,000,000 278,000,000 81,500,000 298,200,000 230,600,000 79,000,000 384,800,000 247,000,000 87,000,000 511,800,000 706,000,000 270,100,000 74,000,000 679,600,000 283,800,000 96,500,000 550,500,000 682,800,000 244,100,000 165,000,000 526,900,000 666,500,000 213,800,000 70,100,000 452,900,000 
  common stock - 0.01 par value, 600,000,000 shares authorized; 413,324,607 and 412,142,602 shares outstanding, respectively       4,200,000                                                                         
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 902,500 and 1,302,500 shares outstanding, respectively       1,152,600,000 1,152,600,000                                                                        
  total equity       7,769,300,000 7,571,400,000 8,003,700,000  7,505,700,000 7,540,400,000 7,531,400,000                           7,455,900,000 7,469,700,000                                       
  dividends payable - preferred stock       8,100,000 8,200,000 19,400,000  19,400,000 8,200,000 19,400,000  19,400,000 8,100,000 19,400,000  19,400,000 8,100,000 19,400,000  19,400,000 8,200,000 19,400,000  11,600,000                                                     
  common stock - 0.01 par value, 600,000,000 shares authorized; 413,148,513 and 412,142,602 shares outstanding, respectively        4,200,000                                                                        
  common stock - 0.01 par value, 600,000,000 shares authorized; 412,982,639 and 412,142,602 shares outstanding, respectively         4,200,000                                                                       
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 1,302,500 and 1,302,500 shares outstanding, respectively         1,546,500,000 1,546,500,000                                                                      
  common stock - 0.01 par value, 600,000,000 shares authorized; 412,142,602 and 405,303,023 shares outstanding, respectively          4,200,000                                                                      
  common stock - 0.01 par value, 600,000,000 shares authorized; 406,049,747 and 405,303,023 shares outstanding, respectively           4,100,000                                                                     
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 1,302,500 shares outstanding           1,546,500,000 1,546,500,000 1,546,500,000                                                                   
  other noncurrent liabilities           288,500,000 329,700,000 669,500,000 690,200,000 527,400,000 566,800,000 444,500,000 286,100,000 214,700,000 198,800,000 187,300,000 218,500,000 224,700,000 222,800,000 218,300,000 177,900,000 215,000,000 184,800,000 191,700,000 194,400,000 187,800,000 188,900,000 199,200,000 200,500,000 182,800,000 187,000,000 188,400,000 208,100,000 186,600,000 270,600,000 294,000,000 291,100,000 297,700,000 224,300,000 219,400,000 216,000,000 219,100,000 216,400,000 225,000,000 226,200,000 246,200,000 242,100,000 247,800,000 244,700,000  157,800,000 163,400,000 162,000,000 175,000,000 183,000,000 152,600,000  163,800,000 153,800,000 168,400,000 187,800,000 169,800,000 190,900,000 186,700,000 195,100,000  177,600,000 179,700,000 178,400,000 177,500,000  195,400,000 187,900,000 204,300,000 
  common stock - 0.01 par value, 600,000,000 shares authorized; 405,878,297 and 405,303,023 shares outstanding, respectively            4,100,000                                                                    
  common stock - 0.01 par value, 600,000,000 shares authorized; 405,734,408 and 405,303,023 shares outstanding, respectively             4,100,000                                                                   
  deferred property taxes              91,000,000   104,200,000 85,600,000                                                              
  common stock - 0.01 par value, 600,000,000 shares authorized; 405,303,023 and 391,760,051 shares outstanding, respectively              4,100,000                                                                  
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 1,302,500 and 440,000 shares outstanding, respectively              1,546,500,000 1,719,800,000 1,718,800,000                                                                
  common stock - 0.01 par value, 600,000,000 shares authorized; 392,628,625 and 391,760,051 shares outstanding, respectively               3,900,000                                                                 
  common stock - 0.01 par value, 600,000,000 shares authorized; 392,328,441 and 391,760,051 shares outstanding, respectively                3,900,000                                                                
  common stock - 0.01 par value, 600,000,000 shares authorized; 392,129,866 and 391,760,051 shares outstanding, respectively                 3,900,000                                                               
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 440,000 shares outstanding                 880,000,000 880,000,000 880,000,000 880,000,000 880,000,000    880,000,000                                                       
  common stock - 0.01 par value, 600,000,000 shares authorized; 391,760,051 and 382,135,680 shares outstanding, respectively                  3,900,000                                                              
  risk management liabilities                  78,200,000 96,900,000 120,000,000 312,100,000 134,000,000 125,000,000 80,700,000 55,800,000 5,000,000 4,800,000 4,000,000 4,600,000 43,200,000 28,700,000 58,500,000 52,900,000 44,500,000 264,500,000 221,100,000 135,400,000                                           
  claims accrued                  28,600,000 26,300,000 22,400,000 24,900,000 165,400,000 184,300,000 235,100,000 258,500,000 114,700,000 365,900,000                                                     
  accrued insurance liabilities                  84,800,000 82,400,000 85,400,000 82,400,000 81,500,000 85,300,000 82,900,000 84,500,000 84,400,000 81,800,000 86,000,000 83,900,000 80,100,000 89,000,000 86,700,000 85,100,000 82,800,000                                              
  utility plant                   20,843,400,000 20,427,100,000 22,862,300,000 24,502,600,000 24,026,100,000 23,576,500,000 23,079,700,000 22,780,800,000 22,328,200,000 21,914,800,000 21,374,000,000 21,026,600,000 20,657,600,000 20,206,400,000 19,680,600,000 19,368,000,000 19,856,900,000 19,578,800,000 19,206,900,000 18,946,900,000 18,484,800,000 26,225,200,000 25,593,900,000 25,234,800,000 24,775,700,000 24,202,600,000 23,695,700,000 23,303,700,000 22,869,700,000 22,346,000,000 21,910,100,000 21,642,300,000 21,303,800,000 20,888,600,000 20,571,100,000 20,337,800,000 20,095,500,000 19,783,800,000 19,575,800,000 19,494,900,000 19,314,200,000 19,049,300,000 18,946,100,000 18,664,800,000 18,498,200,000 18,356,800,000 18,227,700,000 18,040,900,000 17,428,000,000 17,345,800,000 17,462,900,000 17,333,800,000 17,194,900,000 16,987,200,000 16,857,900,000 16,745,900,000 16,684,400,000 16,500,500,000 16,367,000,000 16,270,900,000 16,194,100,000 
  net utility plant                   15,184,400,000 14,878,100,000 15,568,600,000 16,893,300,000 16,462,900,000 16,115,500,000 15,722,800,000 15,522,900,000 15,157,200,000 14,831,100,000 14,325,900,000 14,073,000,000 13,751,400,000 13,372,700,000 12,979,100,000 12,754,300,000 12,836,700,000 12,538,500,000 12,249,600,000 12,093,500,000 11,673,300,000 16,506,400,000 15,907,200,000 15,656,200,000 15,242,500,000 14,758,400,000 14,337,100,000 14,047,200,000 13,611,100,000 13,176,300,000 12,834,700,000 12,655,900,000 12,347,000,000 12,005,800,000 11,765,200,000 11,667,600,000 11,423,200,000 11,180,900,000 11,047,800,000 11,002,300,000 10,766,900,000 10,605,800,000 10,592,400,000 10,431,900,000 10,364,100,000 10,276,000,000 10,149,700,000 10,058,400,000 9,608,900,000 9,532,400,000 9,462,900,000 9,394,000,000 9,344,900,000 9,198,800,000 9,147,300,000 9,108,700,000 9,127,600,000 9,004,700,000 8,951,000,000 8,930,000,000 8,946,500,000 
  other property, at cost, less accumulated depreciation                   894,600,000 894,300,000 18,600,000 18,900,000 18,000,000 18,300,000 18,600,000 19,600,000 17,200,000 16,800,000 130,700,000 286,500,000 290,700,000 296,600,000 309,800,000 313,700,000 17,100,000 17,400,000 17,600,000 18,000,000 17,400,000 401,900,000 376,200,000 360,900,000 344,000,000 330,400,000 320,600,000 317,900,000 301,300,000 297,600,000 284,200,000 260,000,000 195,700,000 143,200,000 136,800,000 132,500,000 125,500,000 114,100,000 92,800,000 94,700,000 33,100,000 91,400,000 91,500,000 111,200,000 112,600,000 112,100,000 112,100,000 67,700,000 67,100,000 338,700,000 342,000,000 346,900,000 349,600,000 352,800,000 354,700,000 388,500,000 426,700,000 421,100,000 423,100,000 427,500,000 438,200,000 
  assets held for sale                   1,565,700,000 1,542,300,000 1,655,800,000                                                           
  common stock - 0.01 par value, 600,000,000 shares authorized; 383,114,130 and 382,135,680 shares outstanding, respectively                   3,800,000                                                             
  liabilities held for sale                   451,800,000 455,400,000 470,900,000                                                           
  legal and environmental                   17,200,000 21,600,000 17,500,000 20,100,000 20,000,000 21,800,000 18,900,000 18,900,000 20,400,000 36,000,000 33,600,000 32,100,000 27,500,000 29,300,000 33,800,000 37,400,000 38,600,000 37,300,000 37,400,000 37,600,000 36,800,000 34,500,000 25,400,000 24,200,000 15,300,000 18,900,000 25,500,000                                   
  deferred investment tax credits                   8,800,000 9,100,000 9,400,000 9,700,000 10,100,000 10,500,000 10,800,000 11,200,000 11,700,000 11,900,000 12,100,000 12,400,000 12,600,000 12,900,000 13,100,000 13,400,000 13,800,000 14,100,000 14,400,000 14,800,000 15,400,000 16,100,000 16,700,000 17,300,000 18,200,000 19,100,000 20,000,000 20,900,000 21,900,000 22,900,000 23,800,000 24,800,000 25,800,000 26,900,000 27,900,000 29,000,000  31,300,000 32,500,000 33,700,000 36,600,000 38,100,000 39,600,000  44,500,000 46,100,000 47,900,000 49,800,000 51,600,000 55,500,000 57,500,000 59,500,000  63,700,000 65,800,000 67,900,000 69,900,000  74,000,000 76,200,000 78,400,000 
  common stock - 0.01 par value, 600,000,000 shares authorized; 382,917,033 and 382,135,680 shares outstanding, respectively                    3,800,000                                                            
  nisource inc.condensed consolidated balance sheets                                                                                
  common stock - 0.01 par value, 600,000,000 shares authorized; 382,694,308 and 382,135,680 shares outstanding, respectively                     3,800,000                                                           
  intangible assets                       212,500,000 215,200,000 218,000,000 220,700,000 223,500,000 226,200,000 228,900,000 231,700,000 234,400,000 237,200,000 239,900,000 242,700,000 245,400,000 246,400,000 250,900,000 253,700,000 256,400,000 258,400,000 261,900,000 264,700,000 267,400,000 270,200,000 272,900,000 275,700,000 278,400,000 281,200,000 283,900,000 286,600,000 289,400,000 292,100,000 294,900,000 297,600,000 300,400,000 303,100,000 305,900,000 308,600,000 314,100,000 316,800,000 319,600,000 325,100,000 327,800,000 330,600,000 333,400,000 336,100,000 338,800,000 425,500,000 428,900,000 432,300,000 435,700,000 477,900,000 489,400,000 492,700,000 495,800,000 498,500,000 513,000,000 516,200,000 520,300,000 
  common stock - 0.01 par value, 600,000,000 shares authorized; 382,135,680 and 372,363,656 shares outstanding, respectively                      3,800,000                                                          
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 440,000 and 420,000 shares outstanding, respectively                      880,000,000 880,000,000 880,000,000                                                        
  common stock - 0.01 par value, 600,000,000 shares authorized; 373,446,862 and 372,363,656 shares outstanding, respectively                       3,800,000                                                         
  common stock - 0.01 par value, 600,000,000 shares authorized; 373,249,295 and 372,363,656 shares outstanding, respectively                        3,800,000                                                        
  common stock - 0.01 par value, 400,000,000 shares authorized; 373,002,671 and 372,363,656 shares outstanding, respectively                         3,800,000                                                       
  common stock - 0.01 par value, 400,000,000 shares authorized; 372,363,656 and 337,015,806 shares outstanding, respectively                          3,800,000                                                      
  preferred stock - 0.01 par value, 20,000,000 shares authorized; 420,000 shares outstanding                          880,000,000                                                      
  common stock - 0.01 par value, 400,000,000 shares authorized; 363,167,067 and 337,015,806 shares outstanding, respectively                           3,700,000                                                     
  preferred stock - 1,000 par value, 20,000,000 shares authorized; 400,000 shares outstanding                           393,900,000 394,400,000                                                    
  accumulated other comprehensive income                           2,500,000                                     -172,000,000 -65,300,000 34,000,000 24,100,000 8,500,000 27,900,000 50,200,000          
  common stock - 0.01 par value, 400,000,000 shares authorized; 362,915,039 and 337,015,806 shares outstanding, respectively                            3,700,000                                                    
  dividends payable                            70,800,000 65,800,000  58,900,000 57,000,000 56,700,000  53,100,000 53,000,000 49,700,000  49,300,000  82,400,000  82,100,000 82,000,000 78,700,000  78,300,000 78,100,000 74,800,000  74,300,000 68,300,000 65,300,000   64,600,000 64,500,000 100,000 64,100,000 64,000,000 200,000                   
  common stockholders’ equity                                                                                
  common stock - 0.01 par value, 400,000,000 shares authorized; 337,598,033 and 337,015,806 shares outstanding, respectively                             3,400,000                                                   
  total common stockholders’ equity                             4,506,200,000 4,320,100,000 4,363,000,000 4,122,800,000 4,191,100,000 4,071,200,000 3,811,600,000 3,810,600,000 3,872,300,000 3,843,500,000 3,800,300,000   6,175,300,000 6,007,300,000 6,028,300,000 6,012,100,000 5,886,600,000 5,700,900,000 5,702,700,000 5,690,700,000 5,554,300,000 5,410,800,000 5,105,300,000 5,080,500,000 4,997,300,000  5,003,400,000 5,014,300,000 4,923,200,000 4,894,900,000 4,928,800,000 4,854,100,000  4,737,700,000 4,728,800,000 4,670,800,000 4,810,900,000 5,064,200,000 5,004,200,000 5,074,500,000 5,127,300,000          
  common stock - 0.01 par value, 400,000,000 shares authorized; 337,015,806 and 323,159,672 shares outstanding, respectively                              3,400,000                                                  
  common stock - 0.01 par value, 400,000,000 shares authorized; 336,691,078 and 323,159,672 shares outstanding, respectively                               3,400,000                                                 
  common stock - 0.01 par value, 400,000,000 shares authorized; 325,756,677 and 323,159,672 shares outstanding, respectively                                3,300,000                                                
  common stock - 0.01 par value, 400,000,000 shares authorized; 324,474,051 and 323,159,672 shares outstanding, respectively                                 3,300,000                                               
  common stock - 0.01 par value, 400,000,000 shares authorized; 323,159,672 and 319,110,083 shares outstanding, respectively                                  3,300,000                                              
  common stock - 0.01 par value, 400,000,000 shares authorized; 322,564,310 and 319,110,083 shares outstanding, respectively                                   3,300,000                                             
  other liabilities and deferred credits                                                                                
  deferred credits                                   95,200,000 93,600,000 91,200,000 90,700,000 99,400,000 105,100,000 105,500,000 101,100,000 102,700,000 103,900,000 100,200,000 91,900,000 94,900,000 92,100,000 88,300,000 84,100,000 86,000,000 85,000,000 80,700,000 78,900,000  75,500,000 72,400,000 68,600,000 75,400,000 71,900,000 72,400,000  76,100,000 76,700,000 76,200,000 85,500,000 78,500,000 119,700,000 117,800,000 117,000,000  89,800,000 91,300,000 83,400,000 81,100,000  65,000,000 63,300,000 58,000,000 
  total other liabilities and deferred credits                                   5,247,800,000 5,253,200,000 5,197,700,000 5,043,000,000 5,048,800,000 6,745,600,000 6,712,900,000 6,580,200,000 6,256,900,000 6,157,500,000 6,115,900,000 5,995,700,000 6,288,500,000 6,234,200,000 6,167,400,000 6,169,700,000 5,881,000,000 5,834,900,000 5,812,600,000 5,797,500,000  5,444,800,000 5,440,800,000 5,430,100,000 5,458,500,000 5,461,700,000 5,302,900,000  4,882,400,000 4,776,100,000 4,084,500,000 4,096,600,000 3,986,200,000 4,017,600,000 4,059,300,000 4,052,400,000  3,749,500,000 3,816,100,000 3,817,700,000 3,830,000,000  3,672,400,000 3,724,600,000 3,681,700,000 
  common stock - 0.01 par value, 400,000,000 shares authorized; 322,004,415 and 319,110,083 shares outstanding, respectively                                    3,200,000                                            
  common stock - 0.01 par value, 400,000,000 shares authorized; 321,360,285 and 319,110,083 shares outstanding, respectively                                     3,200,000                                           
  deferred revenue                                     5,500,000 6,600,000 9,300,000 21,600,000 25,500,000 25,600,000 6,500,000 8,700,000 7,900,000 18,500,000 21,300,000 5,100,000 42,400,000 42,800,000 30,900,000 10,000,000 10,600,000 10,100,000  5,000,000 7,800,000 6,800,000 10,100,000 11,500,000 27,300,000  11,000,000 14,700,000 10,900,000 14,100,000 22,400,000 42,400,000 48,700,000 39,300,000  43,600,000 37,900,000 35,100,000 51,300,000  29,100,000 26,800,000  
  underrecovered gas costs                                      34,800,000 7,100,000 3,500,000                                        
  assets of discontinued operations                                                                                
  common stock - 0.01 par value, 400,000,000 shares authorized; 319,110,083 and 316,037,421 shares outstanding, respectively                                      3,200,000                                          
  retained earnings                                      -1,123,300,000  1,561,100,000 1,597,500,000 1,494,000,000 1,339,900,000 1,390,600,000 1,394,400,000 1,285,500,000 1,133,800,000 1,164,100,000 1,170,500,000 1,059,600,000 925,700,000 980,900,000 980,000,000 917,000,000  952,600,000 978,300,000 901,800,000 899,500,000 935,300,000 865,500,000  923,300,000 901,100,000 739,100,000 782,200,000 1,047,500,000 1,007,400,000 1,059,600,000 1,096,000,000  950,400,000 987,400,000 1,029,100,000 981,600,000  983,200,000 1,006,800,000 925,400,000 
  overrecovered gas and fuel costs                                      148,100,000 169,200,000 198,600,000 172,300,000 45,600,000 21,200,000 49,800,000 25,800,000 32,200,000 31,700,000 64,600,000 63,200,000 22,100,000 52,600,000 84,100,000 74,300,000 48,900,000  121,400,000 91,800,000 11,800,000 38,100,000 43,500,000 220,400,000  302,500,000 35,900,000  700,000 4,400,000 46,100,000 48,100,000 63,300,000  144,400,000 143,200,000 114,600,000 25,800,000  54,200,000 44,500,000 15,500,000 
  liabilities of discontinued operations                                      300,000                                       300,000   
  common stock - 0.01 par value, 400,000,000 shares authorized; 318,474,781 and 316,037,421 shares outstanding, respectively                                       3,200,000                                         
  retained (deficit) earnings                                       -1,182,700,000                                         
  nisource common stockholders’ equity                                                                                
  common stock - 0.01 par value, 400,000,000 shares authorized; 317,668,149 and 316,037,421 shares outstanding, respectively                                        3,200,000                                        
  total nisource common stockholders’ equity                                        6,505,900,000 6,523,500,000                                       
  accrued capital expenditures                                        146,300,000 80,300,000 61,100,000                                      
  underrecovered gas and fuel costs                                         25,500,000 32,000,000 54,700,000 75,700,000 114,300,000 46,400,000 16,400,000 600,000 16,900,000 45,000,000 33,500,000 1,900,000 15,000,000 20,700,000 57,700,000 24,700,000 25,400,000 135,700,000 110,300,000 114,400,000 40,200,000 1,800,000 500,000 180,200,000 313,100,000 344,500,000 245,300,000 99,000,000 134,100,000 195,600,000 163,200,000 70,000,000 81,200,000 190,800,000 421,800,000 230,000,000 85,600,000 183,500,000 293,800,000 
  common stock - 0.01 par value, 400,000,000 shares authorized; 317,281,405 and 316,037,421 shares outstanding, respectively                                         3,200,000                                       
  common stock - 0.01 par value, 400,000,000 shares authorized; 316,037,421 and 313,675,911 shares outstanding, respectively                                          3,200,000                                      
  common stock - 0.01 par value, 400,000,000 shares authorized; 315,597,089 and 313,675,911 shares outstanding, respectively                                           3,200,000                                     
  price risk management assets                                            13,200,000 14,400,000 22,700,000 21,100,000 39,600,000 58,000,000 92,200,000 103,600,000 120,000,000 141,900,000 137,200,000 136,700,000 116,000,000 134,100,000 159,500,000 188,900,000 190,400,000 173,300,000 24,500,000 173,500,000 150,400,000 106,100,000 248,400,000 150,100,000 114,400,000 136,100,000 128,600,000 237,700,000 200,300,000 144,500,000 136,600,000 183,100,000 371,000,000 97,200,000 125,200,000 61,100,000 
  common stock - 0.01 par value, 400,000,000 shares authorized; 315,215,694 and 313,675,911 shares outstanding, respectively                                            3,200,000                                    
  income tax receivable                                             4,100,000 5,100,000 6,400,000 6,400,000 80,500,000 130,900,000 56,000,000 700,000 700,000 900,000 1,200,000 1,200,000 20,400,000 99,000,000 26,400,000 2,900,000 24,900,000                   
  common stock - 0.01 par value, 400,000,000 shares authorized; 314,800,122 and 313,675,911 shares outstanding, respectively                                             3,200,000                                   
  noncurrent deferred revenue                                             21,800,000  23,100,000 37,200,000   22,800,000                            87,400,000 
  assets of discontinued operations and assets held for sale                                                   200,000 200,000 200,000 200,000 2,300,000 2,300,000 2,300,000 7,900,000 8,800,000 12,900,000 18,700,000 180,300,000 46,600,000 45,800,000 295,400,000 299,200,000 536,300,000 50,200,000 45,200,000 36,500,000 43,000,000 46,800,000 57,300,000 49,700,000 34,600,000 34,700,000 34,800,000 40,800,000 23,400,000 
  common stock - 0.01 par value, 400,000,000 shares authorized; 313,675,911 and 310,280,867 shares outstanding, respectively                                              3,200,000                                  
  price risk management liabilities                                              1,400,000 8,800,000 47,500,000 52,700,000 95,200,000 110,200,000 132,700,000 180,400,000 167,800,000  135,000,000 146,100,000 173,900,000 206,900,000 211,100,000 190,100,000  336,000,000 286,500,000 201,500,000 117,400,000 67,500,000 91,700,000 75,300,000 35,400,000  242,100,000 98,300,000 85,700,000 72,300,000  74,100,000 28,400,000 46,900,000 
  liabilities of discontinued operations and liabilities held for sale                                                  3,900,000          900,000 1,700,000  2,300,000 1,500,000 39,700,000 57,200,000 45,600,000 6,200,000 9,900,000 9,800,000  9,900,000 10,000,000       
  legal and environmental reserves                                              32,300,000 34,200,000 43,100,000 41,100,000 42,200,000 36,800,000 35,600,000 37,000,000 43,900,000  46,000,000 68,200,000 86,000,000 83,900,000 97,500,000 146,100,000  322,400,000 375,100,000 467,600,000 452,200,000              
  regulatory liabilities and other removal costs                                              1,669,800,000 1,615,900,000 1,610,500,000 1,611,400,000 1,593,300,000 1,617,100,000 1,615,700,000 1,616,200,000 1,663,900,000  1,624,800,000 1,612,000,000 1,595,800,000 1,591,800,000 1,571,400,000 1,558,800,000  1,411,200,000 1,386,100,000 1,400,300,000 1,427,300,000 1,344,600,000 1,319,700,000 1,313,500,000 1,293,400,000  1,250,500,000 1,237,200,000    1,205,400,000 1,189,000,000  
  common stock - 0.01 par value, 400,000,000 shares authorized; 313,135,192 and 310,280,867 shares outstanding, respectively                                               3,200,000                                 
  common stock - 0.01 par value, 400,000,000 shares authorized; 312,420,078 and 310,280,867 shares outstanding, respectively                                                3,100,000                                
  common stock - 0.01 par value, 400,000,000 shares authorized; 311,814,846 and 310,280,867 shares outstanding, respectively                                                 3,100,000                               
  postretirement and postemployment benefits assets                                                   41,700,000 38,300,000 34,900,000 31,500,000 43,600,000 42,000,000 38,500,000 35,100,000 22,900,000 22,800,000 19,800,000 9,200,000 9,600,000 10,300,000 188,200,000 178,800,000 167,500,000             
  common stock - 0.01 par value, 400,000,000 shares authorized; 310,280,867 and 281,853,571 shares issued and outstanding, respectively                                                  3,100,000                              
  common stock - 0.01 par value, 400,000,000 shares authorized; 309,597,086 and 281,853,571 shares issued and outstanding, respectively                                                   3,100,000                             
  common stock - 0.01 par value, 400,000,000 shares authorized; 284,767,362 and 281,853,571 shares issued and outstanding, respectively                                                    2,900,000                            
  common stock - 0.01 par value, 400,000,000 shares authorized; 283,890,607 and 281,853,571 shares issued and outstanding, respectively                                                     2,900,000                           
  common stock - 0.01 par value, 400,000,000 shares authorized; 281,853,571 and 278,855,291 shares issued and outstanding, respectively                                                      2,800,000                          
  item 1.                                                                                
  common stock — 0.01 par value, 400,000,000 shares authorized; 280,472,662 and 278,855,291 shares issued and outstanding, respectively                                                        2,800,000                        
  temporary lifo liquidation credit                                                        300,000 2,200,000  6,400,000 42,200,000   111,300,000   174,800,000 472,300,000             
  common stock — 0.01 par value, 400,000,000 shares authorized; 279,930,189 and 278,855,291 shares issued and outstanding, respectively                                                         2,800,000                       
  common stock - 0.01 par value, 400,000,000 shares authorized; 278,855,291 and 276,638,021 shares issued and outstanding, respectively                                                          2,800,000                      
  common stock - - 0.01 par value, 400,000,000 shares authorized; 277,818,711 and 276,638,021 shares issued and outstanding, respectively                                                           2,800,000                     
  common stock - 0.01 par value, 400,000,000 shares authorized; 277,290,886 and 276,638,021 shares issued and outstanding, respectively                                                            2,800,000                    
  common stock — 0.01 par value, 400,000,000 shares authorized; 276,638,021 and 274,261,799 shares issued and outstanding, respectively                                                             2,800,000                   
  common stock — 0.01 par value, 400,000,000 shares authorized; 274,500,339 and 274,261,799 shares issued and outstanding, respectively                                                               2,700,000                 
  dividends declared                                                               63,200,000  63,100,000 63,100,000 63,100,000 63,100,000 63,100,000 63,100,000          
  customer deposits                                                               130,700,000 127,300,000 120,500,000 112,400,000 114,400,000 108,600,000 108,400,000 110,400,000  104,900,000 104,500,000 104,600,000 101,900,000  92,700,000 95,300,000 87,100,000 
  as of december 31,                                                                2,008,000,000           2,005,000,000    2,004,000,000 
  common stock — 0.01 par value, 400,000,000 shares authorized; 274,261,799 and 274,176,752 shares issued and outstanding, respectively                                                                2,700,000                
  common stock — 0.01 par value, 400,000,000 shares authorized; 274,229,624 and 274,176,752 shares issued and outstanding, respectively                                                                 2,700,000               
  common stock — 0.01 par value, 400,000,000 shares authorized; 274,216,784                                                                                
  and 274,176,752 shares issued and outstanding, respectively                                                                  2,700,000              
  common stock — 0.01 par value, 400,000,000 shares authorized; 274,167,301 and 274,176,752 shares issued and outstanding, respectively                                                                   2,700,000             
  common stock — 0.01 par value, 400,000,000 shares authorized; 274,161,140 and 273,654,180 shares issued and outstanding, respectively                                                                    2,700,000            
  common stock — 0.01 par value, 400,000,000 shares authorized; 274,149,933 and 273,654,180 shares issued and outstanding, respectively                                                                     2,700,000           
  common stock — 0.01 par value, 400,000,000 shares authorized; 273,919,093 and 273,654,180 shares issued and outstanding, respectively                                                                      2,700,000          
  item 8. financial statements and supplementary data (continued) nisource inc.                                                                                
  total investments                                                                        235,900,000 238,100,000 223,600,000 223,800,000   221,400,000 204,000,000 
  common stock equity                                                                                
  common stock — 0.01 par value, 400,000,000 shares authorized; 272,899,816 and 272,622,905 shares issued and outstanding, respectively                                                                        2,700,000        
  additional paid-in-capital                                                                        3,979,700,000     3,958,800,000 3,943,900,000  
  total common stock equity                                                                        4,805,400,000 4,871,700,000 4,924,500,000 4,933,000,000  4,894,900,000 4,943,000,000 4,787,100,000 
  preferred stock—series without mandatory redemption provisions                                                                                
  dividends declared on common and preferred stocks                                                                        62,800,000 62,800,000 63,800,000 1,100,000  63,700,000 63,600,000 1,100,000 
  common stock — 0.01 par value, 400,000,000 shares authorized; 272,711,758 and 272,622,905 shares issued and outstanding, respectively                                                                         2,700,000       
  additional paid-in-capital, net of deferred stock compensation                                                                         3,972,800,000 3,970,600,000 3,969,400,000    3,924,000,000 
  accumulated other comprehensive loss and other common stock equity                                                                         -91,200,000 -77,900,000 -20,700,000  -49,800,000 -10,400,000 -65,000,000 
  preferred stocks—series without mandatory redemption provisions                                                                          81,100,000 81,100,000  81,100,000 81,100,000 81,100,000 
  common stock — 0.01 par value, 400,000,000 shares authorized; 272,636,673 and 272,622,905 shares issued and outstanding, respectively                                                                          2,700,000      
  common stock equity common stock — 0.01 par value, 400,000,000 shares authorized; 272,622,905 and 270,625,370 shares issued and outstanding, respectively                                                                           2,700,000     
  preferred stock liabilities with mandatory redemption provisions                                                                             600,000 600,000 600,000 
  common stock — 0.01 par value - 400,000,000 shares authorized, 272,322,505 and 270,625,370 shares issued and outstanding, respectively                                                                             2,700,000   
  accrued liability for postretirement and pension benefits                                                                             89,700,000 86,700,000  
  unbilled revenue                                                                              282,800,000 352,700,000 
  common stock — 0.01 par value — 400,000,000 shares authorized, 271,665,136 and 270,625,370 shares issued and outstanding, respectively                                                                              2,700,000  
  common stock - 0.01 par value, 400,000,000 shares authorized; 270,625,370 and 262,630,409 shares issued and outstanding, respectively                                                                               2,700,000 
  current deferred revenue                                                                               31,500,000 

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