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Juniper Networks Quarterly Cash Flow Statements Chart

Quarterly
 | 
Annual
 
 Operating Cash Flow  
 Investing Cash Flow  
 Financing Cash Flow  
 Free Cash Flow  
 Capital Expenditure  
20200630 20200930 20201231 20210331 20210630 20210930 20211231 20220331 20220630 20220930 20221231 20230331 20230630 20230930 20231231 20240331 20240630 20240930 20241231 20250331 -291.4-200.77-110.14-19.5171.11161.74252.37343Milllion

Juniper Networks Quarterly Cash Flow Statements Table

Quarterly
 | 
Annual
 
Unit: USD2025-03-31 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 2010-09-30 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 2002-12-31 2002-09-30 2002-06-30 2002-03-31 
                                                                                              
  cash flows from operating activities:                                                                                            
  net income64,100,000 162,000,000 92,600,000 34,100,000 -800,000 124,300,000 76,100,000 24,400,000 85,400,000 180,400,000 121,500,000 113,400,000 55,700,000 132,900,000 88,900,000 62,000,000 -31,100,000 30,800,000 145,400,000 61,200,000 20,400,000 168,400,000 99,300,000 46,200,000 31,100,000 192,200,000 223,800,000 116,500,000 34,400,000 -148,100,000 165,700,000 179,800,000 108,800,000 188,900,000 172,400,000 140,000,000 91,400,000 197,800,000 197,700,000 158,000,000 80,200,000 -769,600,000 103,600,000 221,100,000 110,600,000  99,100,000 97,900,000 91,000,000             83,786,000 14,769,000 -4,460,000 132,476,000 148,508,000 120,410,000 110,355,000 122,904,000 85,099,000 86,180,000 66,647,000 70,982,000 58,274,000 -1,206,456,000 75,763,000 105,530,000 84,053,000 89,011,000 75,435,000 66,001,000 48,759,000 -12,554,000 33,540,000 14,733,000 7,205,000 13,578,000 3,683,000 8,452,000 -88,330,000 6,231,000 -46,003,000 
  adjustments to reconcile net income to net cash from operating activities:                                                                                            
  share-based compensation expense62,600,000 79,400,000 70,200,000 61,300,000 79,900,000 81,800,000 74,700,000 62,000,000 60,900,000 55,400,000 61,500,000 47,200,000 45,200,000 59,700,000 54,900,000 50,500,000 57,500,000 51,500,000 52,700,000 44,000,000 42,000,000 55,100,000 57,500,000 55,700,000 33,900,000 36,900,000 53,200,000 56,600,000 70,400,000 36,400,000 45,000,000 44,100,000 62,000,000 62,500,000 54,700,000 55,600,000 51,800,000 56,000,000 56,400,000 58,900,000 46,000,000 54,600,000 65,300,000 59,300,000 60,800,000                                                
  depreciation, amortization, and accretion36,500,000 37,300,000 37,400,000 38,000,000 44,200,000 47,300,000 48,900,000 49,100,000 49,400,000 52,300,000 53,900,000 55,200,000 56,300,000 58,100,000 58,400,000 60,500,000 60,400,000 54,400,000 52,000,000 52,000,000 54,000,000 54,800,000 53,800,000 53,000,000 48,700,000 51,300,000 48,300,000 55,200,000 55,700,000 55,900,000 57,600,000 56,300,000 55,800,000 54,800,000 53,300,000 51,600,000 47,000,000 45,000,000 42,500,000 41,500,000 47,500,000 44,200,000 46,300,000 47,500,000 48,100,000                                                
  deferred income taxes-34,800,000 -74,400,000 -83,300,000 -37,700,000 -26,600,000 -107,600,000                           15,300,000 14,400,000 -1,200,000 21,600,000 21,100,000 -24,600,000 -13,900,000 12,600,000 11,300,000 68,500,000 -3,100,000 -37,800,000 -44,500,000 31,800,000 13,800,000 10,900,000 15,700,000 56,864,000 -51,962,000 -9,198,000 -13,904,000 13,239,000 -14,691,000 7,174,000 1,503,000 52,019,000 -13,123,000 -12,471,000 -32,560,000 -27,292,000 20,850,000 48,438,000                             
  benefit for inventory excess and obsolescence6,900,000    -1,000,000                                                                                        
  operating lease assets expense11,500,000 10,800,000 10,700,000 10,800,000 10,800,000 10,200,000 10,200,000 10,200,000 10,100,000 10,000,000 10,000,000 10,200,000 10,100,000 10,400,000 9,700,000 13,100,000 11,700,000 10,800,000 10,500,000 10,500,000 10,500,000 10,000,000 10,700,000                                                                      
  loss on privately-held investments3,300,000  -500,000                                                                                          
  income from equity method investment 3,200,000 2,200,000 2,100,000 2,100,000 3,700,000 1,700,000 2,100,000 2,100,000 2,200,000                                                                                   
  gain on publicly-traded investments and others6,800,000                                                                                            
  changes in operating assets and liabilities, net of acquisitions:                                                                                            
  accounts receivable246,200,000 -206,300,000 -78,800,000 -63,600,000 228,800,000 -106,300,000 -29,800,000 153,400,000 166,100,000 -197,700,000 19,900,000 -199,700,000 145,500,000 -220,900,000 -6,000,000 -9,700,000 204,800,000 -202,200,000 1,400,000 -77,900,000 202,600,000 -243,300,000 22,900,000 -6,300,000 108,600,000 -104,600,000 53,400,000 -23,300,000 170,800,000 -128,100,000 27,100,000 -78,200,000 383,000,000 -300,100,000 -2,900,000 42,700,000 -3,200,000 -203,200,000 -44,700,000 -25,200,000 54,200,000 16,400,000 -54,600,000 37,100,000 -15,700,000 -28,900,000 -18,700,000 2,000,000 -94,300,000 -41,268,000 9,674,000 44,232,000 126,462,000 -133,386,000 44,037,000 -17,628,000 125,610,000 -82,261,000 11,450,000 55,718,000 -85,411,000 55,889,000 -67,172,000 68,012,000 -61,366,000 55,187,000 -54,734,000 10,702,000 -100,230,000 -15,914,000 2,851,000 -7,611,000 36,354,000 -34,167,000 53,995,000 -35,437,000 -24,572,000 -30,339,000 -15,659,000 2,517,000 -25,266,000 -21,390,000 -25,264,000 -9,478,000         
  inventory-3,100,000 48,000,000 41,300,000 16,000,000 -22,500,000 -98,700,000 -70,700,000                                                                                      
  prepaid expenses and other assets14,300,000 -26,400,000 59,500,000 500,000 70,200,000 -11,100,000 293,300,000   -22,000,000 -162,900,000 -319,400,000 -153,700,000 -239,200,000 -15,400,000 -16,300,000 -39,100,000 -74,000,000 -5,100,000 -1,600,000 -37,100,000 -66,900,000 21,400,000 -55,700,000 500,000 -114,800,000 70,400,000 -14,800,000 -11,700,000 -8,200,000 4,800,000 49,900,000 -3,500,000 22,900,000 -8,500,000 1,600,000 -59,600,000 -52,300,000 50,500,000 -19,900,000 -21,800,000 4,900,000 -178,600,000 113,700,000 35,500,000 -60,400,000 19,900,000 -33,300,000 -53,600,000 24,889,000 -7,619,000 -24,198,000 -22,272,000 14,385,000 7,695,000 65,780,000 -59,372,000 -52,101,000 -4,562,000 -11,150,000 2,924,000 -5,328,000 -14,428,000 8,312,000 19,121,000     -488,000    13,805,000                   
  accounts payable-35,300,000 -400,000 -8,300,000 15,400,000 -38,300,000 -30,000,000 -43,900,000 6,600,000 15,400,000 -8,300,000 -12,800,000 43,900,000 44,600,000 7,600,000 11,100,000 10,900,000 -29,400,000 5,800,000 29,600,000 2,200,000 18,400,000 -12,700,000 47,200,000 -38,200,000 10,100,000 31,100,000 1,200,000 2,400,000 -31,200,000 1,400,000 -6,400,000 13,300,000 -18,400,000 14,500,000 -10,800,000 -6,900,000 69,800,000 -58,400,000 -8,000,000 -6,000,000 -7,800,000 -9,100,000 -5,600,000 33,800,000 19,200,000 -8,400,000 2,300,000 -12,500,000 9,100,000 -7,180,000 23,542,000 -10,716,000 -126,846,000 59,833,000 8,089,000 24,417,000 -58,468,000 14,795,000 7,794,000 -14,125,000 -1,644,000 9,710,000 28,736,000 -39,224,000 17,032,000 -6,707,000 14,542,000 -5,097,000 15,339,000 25,741,000 -6,491,000 349,000 19,850,000 22,641,000 -23,698,000 -5,149,000 14,858,000 33,271,000 9,348,000 -7,167,000 8,499,000 12,740,000 4,159,000 3,992,000         
  accrued compensation-145,500,000 47,800,000 47,400,000 54,500,000 -79,400,000 69,300,000 -56,400,000 52,300,000 -78,400,000 62,800,000 -31,200,000 40,700,000 -95,400,000 97,500,000 -22,800,000 57,100,000 -61,500,000 70,300,000 -19,900,000 48,100,000 -59,800,000 51,900,000 -29,600,000 39,100,000 -54,900,000 45,600,000 -20,000,000 29,900,000 -14,100,000 17,800,000 -40,000,000 26,600,000 -47,200,000 58,900,000 -9,800,000 22,100,000 -89,300,000 75,600,000 -32,600,000 57,700,000 -54,100,000 32,300,000 -38,800,000 52,500,000 -92,000,000 83,200,000 -24,600,000 11,200,000 -75,200,000 49,192,000 -15,739,000 36,773,000 -15,426,000 30,397,000 -23,869,000 27,754,000 -66,510,000 -21,587,000 49,824,000 -19,847,000 36,952,000 -10,099,000 20,946,000 -31,720,000 31,330,000 -26,910,000 26,351,000 -29,010,000 38,459,000 6,725,000 26,328,000 -23,253,000 28,716,000 -10,991,000 23,784,000 -28,797,000                 
  income taxes payable32,400,000 29,400,000 7,000,000 -79,700,000 -24,900,000 -235,300,000 51,800,000 54,300,000 29,600,000 32,300,000 -7,300,000 -29,400,000 25,500,000 22,400,000 5,300,000 19,700,000 -23,100,000 2,900,000 -61,000,000 -4,200,000 5,100,000 -31,800,000 -4,900,000 1,900,000 -5,700,000 -25,200,000 -166,300,000 -70,100,000 -7,600,000 438,500,000 -19,100,000 23,800,000 4,100,000 10,600,000 16,100,000 600,000 -24,200,000 -3,900,000 51,500,000 42,600,000 14,100,000 -35,100,000 124,400,000 -59,500,000 21,200,000 -12,400,000 -7,600,000 19,900,000 -38,400,000  47,529,000          -41,141,000                                
  other accrued liabilities-23,500,000 1,500,000 -5,500,000 -27,600,000 -32,500,000 -37,500,000 31,500,000 17,500,000 -19,000,000 3,000,000 -21,700,000 17,800,000 -700,000 -10,100,000 1,100,000 800,000 -72,600,000 28,200,000 -9,600,000 12,800,000 -27,000,000 2,700,000 -29,400,000 7,800,000 -27,900,000 3,100,000 13,000,000 23,600,000 -51,100,000 19,800,000 12,600,000 -8,200,000 -25,500,000 34,400,000 -26,600,000 5,100,000 -29,800,000 46,800,000 -14,300,000 17,700,000 -48,400,000 23,700,000 -62,800,000 -11,400,000 -50,300,000 51,700,000 -19,900,000 29,600,000 -26,500,000 19,538,000 -27,592,000 11,900,000 -9,146,000 -9,670,000 3,639,000 5,689,000 13,981,000 5,823,000 -9,607,000 4,620,000 8,667,000 10,994,000 -11,953,000 22,749,000 -82,312,000 27,882,000 15,549,000 32,179,000 -36,773,000 31,683,000 -14,418,000 12,984,000 -28,387,000 16,518,000 39,747,000 -18,511,000 -14,356,000 3,152,000 -4,904,000 -26,516,000 -23,898,000 10,489,000 42,765,000 -1,463,000         
  deferred revenue74,100,000 174,600,000 -20,800,000 -36,700,000 101,000,000 184,500,000 75,200,000 5,100,000 96,200,000 184,400,000 16,600,000 -2,600,000 53,200,000 133,500,000 -50,300,000 45,500,000 150,100,000 -78,400,000 -43,000,000 32,800,000 104,700,000 -82,400,000 -38,600,000 17,200,000 48,100,000 -71,700,000 -5,500,000 53,800,000 76,200,000 -40,500,000 7,400,000 11,900,000 177,000,000 8,300,000 24,400,000 92,000,000 43,200,000 20,500,000 -70,400,000 99,000,000 4,200,000 -61,000,000 19,100,000 82,800,000 48,200,000 -6,800,000 47,300,000 57,200,000 -69,499,000 -9,966,000 -6,693,000 32,558,000 81,235,000 -44,783,000 -20,049,000 65,844,000 17,239,000 -22,264,000 36,299,000 110,394,000 -5,393,000 36,241,000 22,084,000 27,728,000 -30,277,000 26,871,000 52,672,000 59,963,000 2,623,000 40,494,000 24,610,000 39,621,000 36,705,000 15,422,000 41,018,000 6,733,000 -9,289,000 20,087,000 46,749,000 9,794,000 10,165,000 48,681,000 25,008,000         
  net cash from operating activities316,500,000 279,800,000 192,200,000 -8,900,000 325,000,000 9,100,000 329,200,000 343,000,000 191,500,000 119,600,000 51,800,000 -266,900,000 193,100,000 116,000,000 136,700,000 257,200,000 179,800,000 125,800,000 116,400,000 97,600,000 272,200,000 95,700,000 185,000,000 88,800,000 159,400,000 212,400,000 207,300,000 170,300,000 271,100,000 214,200,000 201,900,000 298,700,000 545,300,000 333,800,000 245,400,000 354,400,000 172,400,000 117,000,000 293,000,000 263,200,000 219,300,000 290,900,000 -78,500,000 425,000,000 126,000,000 390,400,000 176,400,000 284,400,000 -8,900,000 154,829,000 173,241,000 212,064,000 102,266,000 243,605,000 185,164,000 318,307,000 239,650,000 131,411,000 221,343,000 88,546,000 259,605,000 223,946,000 148,681,000 163,865,000 215,111,000 204,624,000 200,542,000 254,902,000 236,643,000 193,240,000 203,996,000 152,644,000 234,228,000 164,914,000 273,460,000 83,002,000 197,510,000 144,924,000 166,120,000 134,389,000 142,451,000 105,220,000 119,012,000 72,765,000       27,867,000 11,984,000 
  capex-24,300,000 -27,200,000 -30,100,000 -23,400,000 -34,800,000 -35,400,000 -40,800,000 -41,100,000 -42,100,000 -31,700,000 -23,900,000 -24,500,000 -25,000,000 -30,500,000 -28,400,000 -21,400,000 -19,700,000 -32,500,000 -24,100,000 -22,000,000 -21,800,000 -26,100,000 -28,300,000 -27,300,000 -27,900,000 -36,500,000 -31,600,000 -37,100,000 -42,200,000 -53,600,000 -33,300,000 -32,200,000 -32,100,000 -51,800,000 -46,000,000 -67,600,000 -49,300,000 -55,400,000 -71,100,000 -39,600,000 -44,200,000 -52,000,000 -42,600,000 -41,000,000 -57,300,000 -50,100,000 -40,700,000 -70,800,000 -71,500,000 -91,947,000 -87,040,000 -87,722,000 -81,991,000 -78,428,000 -71,945,000 -61,969,000 -53,972,000 -54,324,000 -45,350,000 -37,807,000 -39,891,000 -33,786,000 -45,198,000 -34,226,000 -42,876,000 -40,881,000 -47,435,000 -33,412,000 -35,906,000 -35,901,000 -42,678,000 -32,373,000 -32,274,000 -26,404,000 -25,187,000 -18,228,000 -39,319,000 -18,236,000 -18,088,000 -22,549,000 -18,496,000 -25,009,000 -12,068,000 -7,612,000       -14,816,000 -5,776,000 
  free cash flows292,200,000 252,600,000 162,100,000 -32,300,000 290,200,000 -26,300,000 288,400,000 301,900,000 149,400,000 87,900,000 27,900,000 -291,400,000 168,100,000 85,500,000 108,300,000 235,800,000 160,100,000 93,300,000 92,300,000 75,600,000 250,400,000 69,600,000 156,700,000 61,500,000 131,500,000 175,900,000 175,700,000 133,200,000 228,900,000 160,600,000 168,600,000 266,500,000 513,200,000 282,000,000 199,400,000 286,800,000 123,100,000 61,600,000 221,900,000 223,600,000 175,100,000 238,900,000 -121,100,000 384,000,000 68,700,000 340,300,000 135,700,000 213,600,000 -80,400,000 62,882,000 86,201,000 124,342,000 20,275,000 165,177,000 113,219,000 256,338,000 185,678,000 77,087,000 175,993,000 50,739,000 219,714,000 190,160,000 103,483,000 129,639,000 172,235,000 163,743,000 153,107,000 221,490,000 200,737,000 157,339,000 161,318,000 120,271,000 201,954,000 138,510,000 248,273,000 64,774,000 158,191,000 126,688,000 148,032,000 111,840,000 123,955,000 80,211,000 106,944,000 65,153,000       13,051,000 6,208,000 
  cash flows from investing activities:                                                                                            
  purchases of property and equipment-24,300,000 -27,200,000 -30,100,000 -23,400,000 -34,800,000 -35,400,000 -40,800,000 -41,100,000 -42,100,000 -31,700,000 -23,900,000 -24,500,000 -25,000,000 -30,500,000 -28,400,000 -21,400,000 -19,700,000 -32,500,000 -24,100,000 -22,000,000 -21,800,000 -26,100,000 -28,300,000 -27,300,000 -27,900,000 -36,500,000 -31,600,000 -37,100,000 -42,200,000 -53,600,000 -33,300,000 -32,200,000 -32,100,000 -51,800,000 -46,000,000 -67,600,000 -49,300,000 -55,400,000 -71,100,000 -39,600,000 -44,200,000 -52,000,000 -42,600,000 -41,000,000 -57,300,000 -50,100,000 -40,700,000 -70,800,000 -71,500,000 -91,947,000 -87,040,000 -87,722,000 -81,991,000 -78,428,000 -71,945,000 -61,969,000 -53,972,000 -54,324,000 -45,350,000 -37,807,000 -39,891,000 -33,786,000 -45,198,000 -34,226,000 -42,876,000 -40,881,000 -47,435,000 -33,412,000 -35,906,000 -35,901,000 -42,678,000 -32,373,000 -32,274,000 -26,404,000 -25,187,000 -18,228,000 -39,319,000 -18,236,000 -18,088,000 -22,549,000 -18,496,000 -25,009,000 -12,068,000 -7,612,000 -5,252,000 -4,631,000 -4,283,000 -5,222,000 -11,372,000 -4,163,000 -14,816,000 -5,776,000 
  purchases of available-for-sale debt securities-215,400,000 -128,700,000 -79,800,000 -108,000,000 -283,500,000 -126,900,000 -15,200,000 -7,900,000 -5,000,000 -46,000,000 -58,100,000 -141,100,000 -194,300,000 -209,600,000 -104,800,000 -135,100,000 -285,700,000 -289,100,000 -257,100,000 -420,200,000 -1,029,600,000 -875,600,000 -884,400,000 -620,400,000                                                                   
  proceeds from sales of available-for-sale debt securities17,100,000 22,300,000 14,100,000 16,500,000 6,100,000 3,700,000 4,300,000 9,900,000 14,000,000 15,900,000 27,500,000 41,500,000 33,300,000 123,800,000 70,000,000 68,600,000 283,700,000 161,700,000 41,800,000 62,900,000 94,000,000 485,000,000 406,500,000 395,700,000 232,800,000 58,000,000                                                                   
  proceeds from maturities and redemptions of available-for-sale debt securities64,500,000 56,900,000 73,400,000 63,800,000 45,100,000 42,200,000 46,300,000 59,400,000 69,400,000 59,600,000 111,900,000 95,200,000 123,600,000 62,200,000 131,300,000 82,400,000 118,100,000 118,400,000 123,900,000 268,700,000 354,000,000 232,200,000 504,100,000 327,700,000 578,300,000 463,600,000                                                                   
  purchases of equity securities-6,600,000 -2,100,000 -1,300,000 -3,100,000 -2,700,000 -6,100,000 -2,000,000 -1,100,000 -2,400,000 -1,000,000 -3,300,000 -2,900,000 -9,300,000 -1,800,000 -2,200,000 -4,600,000 -1,500,000 -8,000,000 -5,800,000 -500,000 -3,100,000 -96,900,000 -800,000 -4,300,000 -5,100,000 -9,400,000                                                                   
  proceeds from sales of equity securities2,100,000 700,000 1,000,000 200,000 4,300,000 4,700,000 3,200,000 400,000 7,400,000 43,900,000 500,000 1,100,000 2,200,000 20,000,000 600,000 2,100,000 2,900,000 5,100,000 900,000 600,000 3,100,000 9,200,000 900,000 1,900,000 2,200,000 7,100,000                                                                   
  net cash from investing activities-162,600,000 -48,100,000 -22,700,000 -54,000,000 -265,500,000 -118,400,000 -3,900,000 12,500,000 42,200,000 76,300,000 113,500,000 153,800,000 63,900,000 15,600,000 -22,400,000 -81,800,000 102,400,000 -374,900,000 -103,500,000 20,600,000 168,900,000 175,900,000 -147,200,000 -452,800,000 -104,100,000 -165,200,000 -353,300,000 -28,900,000 1,112,200,000 -224,900,000 -85,600,000 11,200,000 -9,700,000 -141,800,000 -181,900,000 -69,200,000 -57,200,000 -38,700,000 -106,000,000 -142,700,000 -221,300,000 283,100,000 95,000,000 -857,300,000 913,200,000 -142,700,000 -120,900,000 -15,700,000 -285,100,000 -228,907,000 -274,116,000 -374,000 -93,303,000 -53,742,000 -123,064,000 -321,208,000 -209,224,000 -285,294,000 -149,219,000 -32,617,000 -118,293,000 -183,538,000 -583,217,000 -63,252,000 41,658,000 -95,864,000 -171,653,000 76,047,000 62,146,000 66,808,000 139,767,000 303,030,000 26,898,000 59,027,000 -55,645,000 -18,354,000 -210,468,000 -141,292,000 -164,573,000 -67,403,000 -142,657,000 -107,830,000 242,980,000 -50,960,000       -144,384,000 78,950,000 
  cash flows from financing activities:                                                                                            
  shares repurchased and retired for tax withholding on vesting of restricted stock-17,000,000                                                                                            
  proceeds from issuance of common stock100,000 12,900,000 28,400,000 32,100,000 200,000 30,100,000 500,000 31,100,000 400,000 27,700,000 500,000 28,600,000 400,000 27,100,000 700,000 28,200,000 200,000 26,900,000 500,000 27,100,000 200,000 25,700,000 200,000 29,500,000 100,000 27,300,000 200,000 29,300,000 100,000 28,900,000 1,800,000 33,700,000 2,600,000 27,500,000 200,000 32,000,000 24,200,000 34,000,000 31,200,000 31,800,000 2,200,000 36,400,000 20,000,000 101,200,000 18,000,000 49,400,000 9,300,000 65,000,000 10,875,000 38,428,000 11,999,000 37,798,000 5,888,000 37,189,000 39,761,000 264,113,000 81,031,000 57,742,000 118,920,000 32,816,000 80,713,000 28,050,000 22,628,000 4,026,000 38,329,000 35,864,000 41,231,000 54,020,000 217,284,000 69,470,000 14,233,000 2,000 17,789,000 17,828,000 51,521,000 42,972,000 27,711,000 35,966,000 39,380,000 54,082,000 49,621,000 30,386,000 41,083,000 14,352,000 42,296,000 24,043,000 11,064,000 8,435,000 9,621,000 1,159,000 7,405,000 
  payment of dividends-73,400,000 -73,000,000 -72,700,000 -71,500,000 -71,400,000 -70,300,000 -70,000,000 -69,900,000 -70,600,000 -67,600,000 -68,000,000 -67,300,000 -67,500,000 -64,200,000 -65,000,000 -64,700,000 -65,200,000 -66,100,000 -66,200,000 -66,300,000 -65,500,000 -63,700,000 -64,700,000 -65,500,000 -66,200,000 -62,300,000 -62,100,000 -62,800,000 -62,100,000                                                                
  net cash from financing activities-90,300,000 -63,800,000 -44,900,000 -70,100,000 -53,900,000 -71,900,000 -165,400,000 -190,700,000 -190,800,000 -155,600,000 -40,800,000 -166,800,000 -165,200,000 -213,300,000 -88,800,000 -178,600,000 -651,000,000 222,000,000 -139,700,000 -63,100,000 -241,600,000 -263,500,000 -209,500,000 -366,200,000 -389,600,000 -64,500,000 -37,700,000 -62,800,000 -803,600,000 -350,200,000 -149,000,000 -161,600,000 -134,000,000 -33,600,000 -124,900,000 -175,400,000 104,300,000 -105,200,000 -54,300,000 -607,200,000 185,300,000 -532,700,000 -560,400,000 12,700,000 -743,800,000 -235,200,000 -33,900,000 -62,500,000 -70,100,000 -226,042,000 -235,495,000 -80,475,000 -6,288,000 -1,892,000 -177,717,000 -103,416,000 1,102,070,000 -45,289,000 -135,987,000 63,297,000 -155,179,000 24,031,000 -16,296,000 -114,714,000 -16,182,000 -370,668,000 -25,898,000 -9,645,000 68,044,000 229,159,000 -1,521,532,000 -14,168,000 1,852,000 21,800,000 -34,496,000 -78,754,000 42,955,000 27,711,000 35,966,000 39,380,000 45,674,000 -5,581,000 -114,581,000 41,083,000       1,159,000 7,405,000 
  effect of foreign currency exchange rates on cash, cash equivalents, and restricted cash600,000 -12,500,000 4,900,000 -2,400,000 -3,600,000  -5,900,000 600,000 1,200,000  -15,500,000 -12,300,000 -1,700,000 -8,400,000 -2,100,000 400,000 -2,000,000 8,300,000 7,400,000 6,300,000 -16,200,000 2,400,000 -5,700,000 500,000 1,600,000 300,000                                                                   
  net increase in cash, cash equivalents, and restricted cash64,200,000 155,400,000 129,500,000 -135,400,000 2,000,000  154,000,000 165,400,000 44,100,000    90,100,000 -90,100,000 23,400,000 -2,800,000 -370,800,000 -18,800,000 -119,400,000 61,400,000 183,300,000 10,500,000 -177,400,000 -729,700,000 -332,700,000 -17,000,000                                                                   
  cash, cash equivalents, and restricted cash at beginning of period1,235,800,000 1,084,300,000  897,700,000  942,700,000 1,383,000,000 1,276,500,000 2,505,800,000                                                                   
  cash, cash equivalents, and restricted cash at end of period1,300,000,000 155,400,000 129,500,000 -135,400,000 1,086,300,000  154,000,000 165,400,000 941,800,000  109,000,000 -292,200,000 1,032,800,000 -90,100,000 23,400,000 -2,800,000 1,012,200,000 -18,800,000 -119,400,000 61,400,000 1,459,800,000 10,500,000 -177,400,000 -729,700,000 2,173,100,000 -17,000,000                                                                   
  non-cash investing and financing activities:                                                                                            
  operating lease right-of-use assets obtained in exchange for operating lease liabilities138,100,000                                                                                            
  benefit from inventory excess and obsolescence 7,000,000 23,800,000                                                                                          
  gain on divestiture                                                                                          
  gain on privately-held investments    14,300,000 5,300,000                                                                                      
  impairment of assets 300,000    1,900,000                                                                                       
  proceeds from divestiture                                                                                          
  proceeds from sale of equity method investment                                                                                            
  subsequent payments related to acquisitions in prior years                   -200,000                                                                        
  funding of loan receivable and other                                                                                            
  repurchase and retirement of common stock  -600,000 -14,600,000 -800,000 -125,500,000 -120,000,000 -151,300,000 -88,400,000 -500,000 -100,000,000 -126,300,000 -149,500,000 -50,900,000 -111,200,000 -131,900,000 -75,400,000 -100,400,000 -2,100,000 -203,200,000 -200,000,000 -51,100,000 -300,900,000 -2,900,000 -1,100,000                                                                   
  payment of debt issuance costs and other                                                                                            
  supplemental disclosures of cash flow information:                                                                                            
  cash paid for interest                                                                                    3,001,000 19,403,000 1,085,000 22,375,000 26,474,000 27,313,000 
  cash paid for income taxes                                                                                            
  non-cash investing activity:                                                                                            
  equity method investment                                                                                           
  other  -7,900,000 900,000 -300,000  -5,000,000 -1,000,000 3,700,000 -12,700,000 1,700,000 1,600,000 6,800,000 -7,600,000 1,800,000 8,600,000 -3,900,000 -5,500,000 -1,200,000 -6,500,000 10,300,000 -100,000 3,200,000 2,600,000 -2,200,000 6,100,000 2,000,000 -200,000 1,700,000                                           2,218,000                     
  funding of loan receivable                                                                                           
  payment of debt issuance costs                                                                                           
  loss on extinguishment of debt             60,600,000                                                                           
  gain on non-qualified deferred compensation plan and other                                                                                            
  payments for business acquisitions, net of cash and cash equivalents acquired          -600,000 -3,300,000 -7,600,000 -175,000,000              -47,900,000 -73,900,000      -27,100,000   -10,000,000                                           
  payment of debt             -423,800,000     -600,000,000 -350,000,000                                                                    
  payment of debt extinguishment costs                                                                                            
  inventory*        -145,700,000                                                                                    
  prepaid expenses and other assets*        -84,300,000                                                                                    
  proceeds from pulse note receivable                                                                                         
  issuance of debt                                                                                           
  payment for debt extinguishment costs             -58,300,000                                                                           
  net decrease in cash, cash equivalents, and restricted cash          109,000,000                                                                                  
  cash paid for interest, net of amounts capitalized                                                                                            
  change in customer financing arrangement                         -600,000 300,000 -16,600,000                                                                
  customer financing arrangement                                                                                            
  construction costs for building with financing obligation                                                                                            
  payment of escrow balance related to prior year acquisitions                                                                                           
  changes in operating assets and liabilities, net of effects from acquisitions:                                                                                            
  purchases of available-for-sale debt investments                           -106,300,000 -8,100,000                                                                
  proceeds from sales of available-for-sale debt investments                           27,400,000 968,000,000                                                                
  proceeds from maturities and redemptions of available-for-sale debt investments                           74,500,000 215,400,000                                                                
  purchases of equity investments                           -4,300,000 -2,000,000                                                                
  proceeds from sales of equity investments                           26,200,000 3,300,000                                                                
  repurchase and retirement of common stock, including prepayment under an accelerated share repurchase program                           -754,200,000                                                                
  effect of foreign currency exchange rates on cash, cash equivalents and restricted cash                           -11,600,000 6,200,000                                                                
  net increase in cash, cash equivalents and restricted cash                           67,000,000 585,900,000                                                                
  cash, cash equivalents and restricted cash at beginning of period                           2,059,100,000                                                                
  cash, cash equivalents and restricted cash at end of period                           67,000,000 2,645,000,000                                                                
  purchases of trading investments                             -700,000 -1,400,000 -700,000 -1,800,000 -600,000 -1,100,000 -700,000 -2,500,000 -600,000 -1,300,000 -600,000 -1,900,000 -600,000 -1,100,000 -600,000 -1,800,000 -600,000 -1,000,000 -600,000 -1,500,000 -324,000 -656,000 -461,000 -2,659,000 -639,000 -1,448,000 -632,000 -2,495,000 -648,000 -445,000 -1,245,000                                 
  payment of escrow balance related to prior year acquisition                            -22,200,000                                                                
  non-cash restructuring benefits                                                                                            
  (gain) loss on investments and other                                                                                            
  purchases of available-for-sale investments                             -584,300,000 -522,200,000 -397,500,000 -378,900,000 -346,100,000 -457,000,000 -434,200,000 -360,700,000 -338,800,000 -306,300,000 -442,500,000 -398,800,000 -470,200,000 -392,900,000 -1,250,500,000 -327,100,000 -424,400,000 -456,600,000 -312,800,000 -582,200,000 -487,424,000 -394,234,000 -243,557,000 -371,285,000 -403,889,000 -599,804,000 -855,897,000 -437,773,000 -429,506,000 -484,288,000 -447,716,000 -296,699,000 -353,384,000 -702,159,000 -109,290,000 -89,172,000 -170,210,000 -189,605,000 -25,020,000 -282,681,000 -15,934,000 -117,817,000 -72,567,000 -192,811,000 -132,949,000 -296,681,000 -212,540,000 -191,575,000 -235,235,000 -155,798,000 -235,499,000 -227,525,000 -120,615,000 -62,853,000 -194,137,000 -313,966,000 -163,723,000 -270,238,000 -105,340,000 -270,508,000 -331,840,000 
  proceeds from sales of available-for-sale investments                             182,800,000 332,100,000 210,300,000 218,800,000 197,000,000 319,300,000 379,600,000 286,200,000 235,700,000 175,000,000 281,400,000 169,500,000 709,000,000 414,100,000 283,200,000 1,221,400,000 275,200,000 272,900,000 255,700,000 331,800,000 269,081,000 225,477,000 168,276,000 231,366,000 230,300,000 365,678,000 491,957,000 193,301,000 85,898,000 130,376,000 224,514,000 83,103,000 92,456,000 47,419,000 62,401,000                             
  proceeds from maturities and redemptions of available-for-sale investments                             220,300,000 170,900,000 166,100,000 184,300,000                                                            
  proceeds from sales of trading investments                                                                                            
  purchases of privately-held investments                             -500,000     -10,500,000 -2,200,000 -3,200,000 -9,400,000 -7,300,000 -3,300,000 -1,700,000 -20,900,000 -6,000,000 -7,100,000 -7,300,000 -1,077,000 -5,000,000                                          
  proceeds from sales of privately-held investments                             8,800,000    6,700,000   300,000    2,400,000 2,500,000 1,000,000 6,700,000 100,000 1,600,000  12,876,000                                          
  changes in restricted cash                                 900,000 -2,900,000   -2,300,000    -400,000 20,000,000 25,000,000     -80,000 -20,609,000 -246,000 35,000 -30,000 92,000   -136,000 -10,746,000 -1,550,000 -10,001,000    -5,538,000 -3,085,000 520,000  -10,000,000    1,848,000                   
  payment of financing obligations                                                                                            
  effect of foreign currency exchange rates on cash and cash equivalents                             3,700,000 3,900,000 2,200,000 7,200,000 -14,200,000 -6,500,000 1,100,000 5,600,000 -5,700,000 -9,500,000 6,200,000 -12,100,000                                                    
  net increase in cash and cash equivalents                             -357,200,000 -28,800,000 150,500,000 408,800,000 144,200,000 -67,900,000 110,900,000 225,100,000    171,200,000    295,400,000   206,200,000 -364,100,000 -300,120,000 -336,370,000 131,215,000 2,675,000 187,971,000 -115,617,000 -106,317,000 1,132,496,000  -63,863,000 119,226,000 -13,867,000 64,439,000 -450,832,000 -14,101,000 240,587,000 -261,908,000 2,991,000 321,304,000 366,833,000 489,207,000 -1,177,769,000 441,506,000 262,978,000 245,741,000 183,319,000 -14,106,000 29,997,000 31,343,000 37,513,000 106,366,000 45,468,000 -8,191,000 247,411,000 62,888,000        98,339,000 
  cash and cash equivalents at beginning of period                             1,833,200,000 1,420,900,000 1,639,600,000 2,284,000,000 2,407,800,000 -20,000 2,910,420,000 1,811,887,000 1,604,723,000 2,019,084,000 1,716,110,000 1,596,333,000 918,401,000 713,182,000 365,606,000      606,845,000 
  cash and cash equivalents at end of period                             -357,200,000 -28,800,000 150,500,000 2,242,000,000 144,200,000 -67,900,000 110,900,000 1,646,000,000 -32,600,000 123,200,000 -480,500,000 1,810,800,000 23,700,000 -543,900,000 -419,600,000 2,579,400,000 12,500,000 21,600,000 206,200,000 2,043,700,000 -300,140,000 -336,370,000 131,215,000 2,913,095,000 187,971,000 -115,617,000 -106,317,000 2,944,383,000 -199,172,000 -63,863,000 1,723,949,000 -13,867,000 64,439,000 -450,832,000 2,004,983,000 240,587,000 -261,908,000 2,991,000 2,037,414,000 366,833,000 489,207,000 -1,177,769,000 2,037,839,000 262,978,000 245,741,000 183,319,000 904,295,000 29,997,000 31,343,000 37,513,000 819,548,000 45,468,000 -8,191,000 247,411,000 428,494,000      -341,056,000 -115,358,000 705,184,000 
  (gain) loss on investments and disposal of fixed assets                              -4,900,000                                                              
  purchases and retirement of common stock                              -140,200,000 -125,600,000 -129,700,000 -700,000 -113,800,000 -126,700,000 -83,400,000 -96,000,000 -52,900,000 -602,300,000 -402,400,000 -501,500,000 -853,900,000 -1,300,000 -905,800,000 -245,700,000 -92,900,000 -106,700,000 -132,500,000 -250,530,000 -249,983,000 -93,999,000 -56,088,000 -193,419,000 -150,000,000 -205,171,000 -135,026,000 -177,447,000 -76,225,000 -212,407,000 -72,111,000 -49,524,000 -119,846,000 -42,513,000 -440,912,000 -68,218,000 -53,057,000                         
  payment of cash dividends                              -37,700,000 -37,800,000 -38,000,000  -38,000,000 -38,100,000 -38,300,000 -38,300,000 -38,500,000 -38,700,000 -40,800,000 -42,200,000                                                   
  (gain) loss on investments and fixed assets                                -1,000,000                                                            
  non-cash restructuring and other (benefits) charges                                                                                            
  impairment of goodwill                                                                                            
  gain on sale of junos pulse                                                                                            
  gain on investments and fixed assets                                 1,900,000                                                           
  gain on legal settlement                                         -800,000                                                  
  excess tax benefits from share-based compensation                                 -900,000 -200,000   -4,900,000 -3,100,000 -2,600,000 -1,700,000 -600,000 -800,000 -1,300,000 -6,700,000 -400,000 -200,000 -200,000 -1,100,000 -16,000 -414,000 -2,451,000 -4,319,000 -437,000 -1,193,000 -4,290,000 -39,041,000   -20,520,000                                 
  proceeds from sale of junos pulse                                                                                            
  issuance of long-term debt                                 494,000,000 594,600,000 346,500,000         991,556,000                                    
  payment of long-term debt                                                                                          
  customer financing arrangements                                         8,200,000 100,000 -7,300,000 8,000,000 -7,900,000 9,400,000                                              
  receipt of a promissory note in connection with the sale of junos pulse                                                                                            
  restructuring and non-cash acquisition charges                                  800,000                                                          
  proceeds from maturities of available-for-sale investments                                  79,600,000 73,200,000 79,600,000 122,400,000 81,500,000 58,600,000 57,300,000 -1,400,000 104,800,000 154,900,000 79,300,000 78,600,000 103,800,000 129,800,000 54,000,000 127,995,000 60,070,000 148,795,000 222,840,000 199,212,000 208,150,000 111,740,000 126,260,000 187,101,000 321,403,000 235,960,000 136,110,000 125,275,000 120,200,000 16,850,000                             
  purchases of investments in privately-held companies                                                                                            
  payment under lease obligations                                  -800,000                                                          
  payment of acquired debt                                                                                            
  gain on investments                                   -3,600,000 5,400,000 -6,000,000 -200,000 -600,000 -2,800,000 1,900,000 -800,000 -166,200,000  -4,000,000                                              
  loss on disposal of fixed assets                                       -200,000 1,100,000 800,000                                                
  payment of assumed debt                                                                                            
  restructuring and other charges                                        1,400,000   72,000,000 122,400,000 18,900,000    11,082,000                                           
  repayment of long-term debt                                    -300,000,000                                                        
  payment for capital lease obligation                                     400,000 -400,000 -1,400,000 30,000                                          
  restructuring and other (benefits) charges                                     -100,000                                                       
  purchase of licensed software                                               -3,000                                           
  net decrease in cash and cash equivalents                                     -32,600,000 123,200,000   23,700,000 -543,900,000                                                  
  non-cash investing activities:                                                                                            
  construction costs financed for build-to-suit lease                                                                                            
  restructuring and other (benefit) charges                                                                                            
  purchase of equity forward contract                                           -300,000,000                                                
  issuance of common stock and equity awards assumed in business acquisitions                                                                                            
  property and equipment acquired under capital lease                                                                                            
  licensed software acquired                                                                                            
  restructuring and other (credit) charges                                                                                            
  consolidated net income                                                 95,697,000 16,814,000 57,719,000 16,270,000 96,163,000 83,671,000 115,518,000 129,660,000 134,337,000 130,343,000 164,610,000                                 
  adjustments to reconcile consolidated net income to net cash from operating activities:                                                                                            
  non-cash share-based compensation expense                                                                                            
  (gain) loss on investments                                                -2,300,000 -18,890,000                                           
  cash paid (received) for income taxes                                                                                            
  share-based compensation                                              69,300,000 61,500,000 49,900,000        47,586,000 44,391,000 44,603,000 40,561,000                                 
  depreciation and amortization                                              41,400,000 42,100,000 51,600,000 49,145,000 48,028,000 46,431,000 43,396,000  43,337,000 41,891,000 40,758,000 39,618,000 37,479,000 35,269,000 36,570,000 36,448,000 37,819,000 37,536,000 32,851,000 38,859,000 40,375,000 55,389,000 49,916,000 48,056,000 48,934,000 46,260,000 44,416,000 44,082,000 43,164,000 41,828,000                 
  other non-cash charges                                              300,000 700,000 300,000                -85,000 -74,000 332,000 440,000      372,000                   
  restructuring charges                                               8,800,000 7,700,000                                            
  payments for business acquisitions, net of cash and cash equivalents                                                                                            
  change in customer financing arrangements                                                -2,300,000 13,567,000 -24,354,000 504,000 7,683,000 -8,217,000 -22,680,000 2,533,000 12,531,000 4,061,000                                   
  non-cash portion of share-based compensation                                                 56,698,000 59,115,000 61,880,000 65,007,000 52,525,000 58,993,000                                      
  accrued litigation settlements                                                         -169,330,000                                 
  income tax payable                                                    -3,750,000 -17,028,000 19,021,000 13,121,000 38,099,000   -1,088,000                                 
  payment for business acquisitions, net of cash and cash equivalents acquired                                                                                            
  proceeds from the sales of privately-held investments                                                                                            
  return of capital to noncontrolling interest                                                         -1,000,000 -2,000,000                                 
  amortization of debt issuance costs                                                  236,000 236,000 236,000  236,000                                899,000 778,000     
  purchase of other assets                                                                                            
  loss on equity investments                                                    14,000,000                                        
  payment for business acquisition, net of cash and cash equivalents acquired                                                    -90,487,000  -28,000 -2,500,000 -28,573,000 -69,118,000                                   
  purchases of privately-held and other equity investments                                                    -1,122,000 -649,000 -23,759,000 -2,671,000 -5,972,000                                    
  excess tax benefit from share-based compensation                                                    4,319,000 437,000 1,193,000 4,290,000 39,041,000                                    
  depreciation                                                                             13,543,000 12,883,000 11,735,000 11,530,000 10,601,000 10,109,000 8,603,000 8,244,000 11,093,000 11,794,000 12,867,000     
  amortization                                                                                            
  loss/(gain) on equity investments                                                     -656,000                                       
  other charges                                                                                            
  cash (received) paid for taxes                                                                                            
  capitalized interest                                                                                            
  gain on equity investments                                                                                            
  changes in operating assets and liabilities:                                                                                            
  (gain) loss on equity investments                                                                                           
  change in excess tax benefits from share-based compensation                                                         -4,645,000                                   
  change in excess tax benefit from share-based compensation                                                                                            
  purchases of privately-held equity investments                                                                                            
  loss on equity investment                                                                                            
  (purchases of) proceeds from privately-held equity investments                                                           -4,773,000                                 
  net proceeds from (payments for) customer financing arrangements                                                           2,082,000                                 
  stock-based compensation                                                            38,214,000 34,354,000 33,529,000 33,562,000 29,256,000 28,804,000 27,345,000 22,728,000 19,322,000 21,227,000 21,499,000 25,942,000 18,549,000 22,855,000 23,176,000 23,065,000                 
  accrued warranty                                                                        750,000 -1,169,000 -539,000 444,000 -2,376,000 1,502,000   -1,298,000 -862,000 3,708,000 2,049,000         
  payments made in connection with business acquisitions                                                                                            
  net proceeds from customer financing arrangements                                                            15,829,000                                
  redemption of convertible debt                                                                                            
  proceeds from noncontrolling interest                                                                                            
  cash paid for taxes                                                                                            
  supplemental disclosure of non-cash financing activities:                                                                                            
  common stock issued in connection with conversion of the senior notes                                                                55,000                           
  loss on minority equity investments                                                                                           
  purchases of minority equity investments                                                                                            
  supplemental disclosure of non-cash investing and financing activities:                                                                                            
  change in excess tax benefit from employee stock option plans                                                                                            
  minority equity investments                                                              -2,204,000 1,013,000 2,042,000 -2,500,000 -2,000,000 -4,000,000    -4,184,000 -3,000,000 -90,000 -8,855,000 -968,000 -45,000 -90,000 -1,090,000   -75,000 -75,000   
  net (payments) proceeds from customer financing arrangements                                                                                            
  operating activities:                                                                                            
  loss on minority equity investment                                                               1,686,000                             
  excess tax benefit from employee stock option plans                                                               -3,110,000 -1,426,000 -32,532,000 -5,018,000 -1,206,000    -739,000                     
  investing activities:                                                                                            
  financing activities:                                                                                            
  net (payments) proceeds from distributor financing arrangement                                                               -20,606,000                             
  restructuring, impairments, and special charges                                                                                            
  maturities and sales of available-for-sale investments                                                                171,655,000 123,265,000 68,472,000 135,959,000 102,052,000 112,784,000 465,126,000 349,119,000 181,435,000 158,189,000 165,718,000 126,733,000 264,109,000 142,079,000 207,437,000 191,422,000 31,799,000 152,720,000 441,866,000 78,355,000  338,658,000 230,290,000 201,386,000     
  change in restricted cash                                                                                            
  redemption of convertible senior notes                                                                                            
  net proceeds from distributor financing arrangement                                                                20,880,000 -606,000 1,714,000 975,000                         
  gain on minority equity investments                                                                                           
  redemption of convertible subordinated notes                                                                 -11,000                         
  common stock issued in connection with acquisitions                                                                                            
  prepaid expenses, other current assets and other long-term assets                                                                  -12,980,000 5,750,000    6,983,000    -11,585,000 11,070,000 -13,881,000 -3,789,000 -19,601,000 -38,402,000 -1,609,000 -22,157,000 5,915,000         
  non-cash portion of debt issuance costs and disposal of property and equipment                                                                    1,448,000 363,000 482,000 472,000    363,000                 
  in-process research and development                                                                            5,300,000 3,800,000            
  gain on and write-down of investments                                                                                            
  tax benefit of employee stock option plans                                                                            34,116,000 30,781,000 35,685,000 28,910,000             
  increase in restricted cash                                                                            -27,748,000 64,000 -7,091,000 -73,000 -117,000 -42,000   -5,837,000       
  retirement of common stock                                                                                -8,408,000            
  supplemental schedule of non-cash investing and financing activities:                                                                                            
  common stock issued in connection with business combinations                                                                                            
  stock options assumed in connection with business combinations                                                                                            
  deferred stock compensation in connection with business combinations                                                                                            
  impairment of goodwill and intangible assets                                                                                           
  gain on minority equity investment                                                                                           
  excess tax benefits from employee stock plans                                                                     -11,875,000                       
  payment for business acquisitions                                                                                           
  purchases and subsequent retirement of common stock                                                                     -1,594,055,000 -29,140,000  -186,388,000                 
  supplemental disclosure of non-cash investing activities:                                                                                            
  excess tax benefits from stock-based compensation                                                                       739,000  -4,011,000                   
  (gain) loss on sale or write-down of investments                                                                                            
  loss on redemption of convertible subordinated notes                                                                                            
  excess tax benefit of employee stock option plans                                                                                            
  decrease (increase) in restricted cash                                                                           6,180,000                 
  acquisition of businesses, net of cash and cash equivalents acquired                                                                                            
  tax benefits from stock-based compensation                                                                                            
  stock options assumed in connection with acquisitions                                                                                            
  deferred stock compensation assumed in connection with acquisitions                                                                                            
  payment for business acquisitions, net of cash and cash equivalents                                                                                            
  proceeds from issuance of convertible senior notes                                                                                          
  deferred stock compensation                                                                                            
  common stock issued in connection with the retirement of convertible subordinated notes                                                                                            
  common stock issued in connection with conversion of the zero coupon convertible senior notes                                                                                            
  amortization of purchased intangibles, deferred stock compensation and debt issuance costs                                                                             29,752,000 24,407,000 22,327,000   37,958,000 4,599,000         
  loss on disposal of property and equipment                                                                                            
  acquisition of businesses, net of cash and cash equivalents                                                                             -43,804,000               
  supplemental disclosure of non-cash investing activities                                                                                            
  gain on redemption of convertible subordinated notes                                                                                           
  restructuring and other                                                                                            
  write-down of investments                                                                                            
  (gain) loss on redemption of convertible subordinated notes                                                                                            
  gain on sale of investments                                                                                    -4,387,000 -4,352,000     
  amortization of purchased intangibles, deferred stock compensation and debt costs                                                                                            
  write-down of equity investments                                                                                            
  gain on sale of equity investments                                                                                            
  cash and cash equivalents acquired in connection with the netscreen acquisition, net of cash paid                                                                                           
  decrease in restricted cash                                                                                   2,000         
  adjustments to reconcile net income to net cash from activities:                                                                                            
  amortization of purchased intangibles, deferred stock compensation and debt related costs                                                                                            
  gain on retirement of convertible subordinated notes                                                                                    15,193,000 -9,220,000   -1,000    
  amortization of goodwill                                                                                            
  maturities and sale of available-for-sale investments                                                                                            
  retirement of convertible subordinated notes                                                                                    -410,854,000 -284,106,000       
  amortization of purchased intangibles, deferred stock compensation, debt costs and other non-cash transactions                                                                                            
  cash paid in connection with the unisphere networks acquisition, net of cash and cash equivalents acquired                                                                                            
  supplemental disclosure of cash flow information:                                                                                            
  common stock issued in connection with the unisphere networks acquisition                                                                                            
  common stock issued in connection with the pacific broadband earn-out provision                                                                                            
  amortization of purchased intangibles and deferred stock compensation                                                                                      7,803,000 7,522,000     
  amortization of debt related charges                                                                                            
  issuance of stock as a charitable contribution                                                                                            
  maturities of available-for-sale investments                                                                                          140,940,000 417,566,000 
  proceeds from issuance of convertible subordinated notes                                                                                            
  repurchase of common stock                                                                                            
  amortization of purchased intangible assets, deferred stock compensation and other non-cash transactions                                                                                            
  impairment loss on equity investments                                                                                            
  changes in operating assets and liabilities                                                                                            
  cash paid for retirement of convertible subordinated notes                                                                                            
  supplemental disclosures of cash flow information                                                                                            
  minority interest in equity investments                                                                                           -1,000,000 
  net income/                                                                                            
  adjustments to reconcile net income/(loss) to net cash from operating activities:                                                                                            
  purchase of property and equipment                                                                                            
  purchase of equity investments                                                                                            
  supplemental schedule of noncash investing and financing activities                                                                                            
  common stock issued in connection with the acquisition of goodwill and purchased intangibles                                                                                            

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