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Supplemental Oil and Gas Information (Results of Operations for Oil andGas Producing Activities) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues |  |  |  |  |  |  |
Revenues | [1] | $ 2,088,100,000 |  | $ 1,799,500,000 |  | $ 2,775,000,000 |
Other operating revenues | [1] | 132,400,000 |  | 5,100,000 |  | 159,700,000 |
Total revenues | [1] | 2,220,500,000 |  | 1,804,600,000 |  | 2,934,700,000 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [1] | 468,400,000 |  | 559,400,000 |  | 832,300,000 |
Severance and ad valorem taxes | [1] | 43,700,000 |  | 43,800,000 |  | 65,800,000 |
Exploration costs charged to expense | [1] | 61,000,000 |  | 58,500,000 |  | 395,500,000 |
Undeveloped lease amortization | [1] | 61,800,000 |  | 43,400,000 |  | 75,400,000 |
Depreciation, depletion and amortization | [1] | 939,900,000 |  | 1,037,300,000 |  | 1,607,900,000 |
Accretion of asset retirement obligations | [1] | 42,600,000 |  | 46,700,000 |  | 48,700,000 |
Impairment of assets |  | 0 |  | 95,088,000 | [2] | 2,493,156,000 | [2]
Redetermination expense |  | 15,000,000 | [1] | 39,100,000 | [2] |  |
Deepwater rig contract exit costs |  |  |  |  |  | 282,000,000 |
Selling and general expenses | [1] | 123,700,000 |  | 147,400,000 |  | 177,200,000 |
Other expenses (benefits) | [1] | 30,700,000 |  | 13,900,000 |  | 360,600,000 |
Total costs and expenses | [1] | 1,786,800,000 |  | 2,084,600,000 |  | 6,056,600,000 |
Results of operations before taxes | [1] | 433,700,000 |  | (280,000,000) |  | (3,121,900,000) |
Income tax expense (benefit) | [1] | 137,100,000 |  | (155,100,000) |  | (1,111,000,000) |
Results of operations | [1] | 296,600,000 |  | (124,900,000) |  | (2,010,900,000) |
Crude Oil and Natural Gas Liquids [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 1,756,900,000 |  | 1,506,800,000 |  | 2,351,500,000 |
Natural Gas [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 331,200,000 |  | 292,700,000 |  | 423,500,000 |
United States [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 951,200,000 |  | 685,800,000 |  | 1,247,300,000 |
Other operating revenues | [1] | 2,700,000 |  | (100,000) |  | 6,300,000 |
Total revenues | [1] | 953,900,000 |  | 685,700,000 |  | 1,253,600,000 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [1] | 198,500,000 |  | 218,600,000 |  | 312,000,000 |
Severance and ad valorem taxes | [1] | 42,200,000 |  | 37,000,000 |  | 55,900,000 |
Exploration costs charged to expense | [1] | 7,800,000 |  | 6,100,000 |  | 258,200,000 |
Undeveloped lease amortization | [1] | 60,200,000 |  | 38,400,000 |  | 59,200,000 |
Depreciation, depletion and amortization | [1] | 546,100,000 |  | 600,500,000 |  | 794,900,000 |
Accretion of asset retirement obligations | [1] | 17,400,000 |  | 17,100,000 |  | 20,200,000 |
Impairment of assets | [1] |  |  |  |  | 329,000,000 |
Selling and general expenses | [1] | 61,800,000 |  | 68,800,000 |  | 88,200,000 |
Other expenses (benefits) | [1] | 20,000,000 |  | (7,500,000) |  | 288,700,000 |
Total costs and expenses | [1] | 954,000,000 |  | 979,000,000 |  | 2,206,300,000 |
Results of operations before taxes | [1] | (100,000) |  | (293,300,000) |  | (952,700,000) |
Income tax expense (benefit) | [1] | 2,500,000 |  | (87,900,000) |  | (337,000,000) |
Results of operations | [1] | (2,600,000) |  | (205,400,000) |  | (615,700,000) |
United States [Member] | Crude Oil and Natural Gas Liquids [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 913,300,000 |  | 650,700,000 |  | 1,176,900,000 |
United States [Member] | Natural Gas [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 37,900,000 |  | 35,100,000 |  | 70,400,000 |
Canada [Member] |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |
Impairment of assets |  |  |  | 95,088,000 |  | 683,574,000 |
Canada [Member] | Conventional [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 358,800,000 |  | 301,700,000 |  | 348,700,000 |
Other operating revenues | [1] | 126,700,000 |  | (700,000) |  | (2,400,000) |
Total revenues | [1] | 485,500,000 |  | 301,000,000 |  | 346,300,000 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [1] | 101,100,000 |  | 102,600,000 |  | 102,400,000 |
Severance and ad valorem taxes | [1] | 1,500,000 |  | 4,300,000 |  | 4,800,000 |
Exploration costs charged to expense | [1] | 500,000 |  | 3,600,000 |  | 700,000 |
Undeveloped lease amortization | [1] | 1,600,000 |  | 4,500,000 |  | 14,400,000 |
Depreciation, depletion and amortization | [1] | 185,400,000 |  | 186,700,000 |  | 211,200,000 |
Accretion of asset retirement obligations | [1] | 7,900,000 |  | 10,900,000 |  | 7,200,000 |
Impairment of assets | [1] |  |  | 95,100,000 |  | 683,600,000 |
Selling and general expenses | [1] | 28,300,000 |  | 28,600,000 |  | 25,500,000 |
Other expenses (benefits) | [1] | 2,300,000 |  | 7,500,000 |  | 43,900,000 |
Total costs and expenses | [1] | 328,600,000 |  | 443,800,000 |  | 1,093,700,000 |
Results of operations before taxes | [1] | 156,900,000 |  | (142,800,000) |  | (747,400,000) |
Income tax expense (benefit) | [1] | 44,400,000 |  | (58,900,000) |  | (191,200,000) |
Results of operations | [1] | 112,500,000 |  | (83,900,000) |  | (556,200,000) |
Canada [Member] | Synthetic Oil [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] |  |  | 60,700,000 |  | 203,000,000 |
Other operating revenues | [1] |  |  | 3,600,000 |  | 400,000 |
Total revenues | [1] |  |  | 64,300,000 |  | 203,400,000 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [1] |  |  | 69,800,000 |  | 166,000,000 |
Severance and ad valorem taxes | [1] |  |  | 2,500,000 |  | 5,100,000 |
Depreciation, depletion and amortization | [1] |  |  | 16,500,000 |  | 50,700,000 |
Accretion of asset retirement obligations | [1] |  |  | 2,400,000 |  | 5,400,000 |
Selling and general expenses | [1] |  |  | 500,000 |  | 1,000,000 |
Total costs and expenses | [1] |  |  | 91,700,000 |  | 228,200,000 |
Results of operations before taxes | [1] |  |  | (27,400,000) |  | (24,800,000) |
Income tax expense (benefit) | [1] |  |  | (75,400,000) |  | 2,400,000 |
Results of operations | [1] |  |  | 48,000,000 |  | (27,200,000) |
Canada [Member] | Crude Oil and Natural Gas Liquids [Member] | Conventional [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 203,700,000 |  | 171,700,000 |  | 181,000,000 |
Canada [Member] | Crude Oil and Natural Gas Liquids [Member] | Synthetic Oil [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] |  |  | 60,700,000 |  | 203,000,000 |
Canada [Member] | Natural Gas [Member] | Conventional [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 155,100,000 |  | 130,000,000 |  | 167,700,000 |
Malaysia [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 778,100,000 |  | 751,300,000 |  | 976,000,000 |
Other operating revenues | [1] | 3,000,000 |  | 2,100,000 |  | 155,400,000 |
Total revenues | [1] | 781,100,000 |  | 753,400,000 |  | 1,131,400,000 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [1] | 168,800,000 |  | 168,400,000 |  | 251,900,000 |
Exploration costs charged to expense | [1] | 2,400,000 |  | 5,200,000 |  | 37,600,000 |
Depreciation, depletion and amortization | [1] | 204,600,000 |  | 227,700,000 |  | 544,900,000 |
Accretion of asset retirement obligations | [1] | 17,300,000 |  | 16,300,000 |  | 15,900,000 |
Impairment of assets | [1] |  |  |  |  | 1,480,600,000 |
Redetermination expense | [1] | 15,000,000 |  | 39,100,000 |  |  |
Selling and general expenses | [1] | 14,000,000 |  | 15,900,000 |  | 5,700,000 |
Other expenses (benefits) | [1] | 8,400,000 |  | 23,800,000 |  | 15,900,000 |
Total costs and expenses | [1] | 430,500,000 |  | 496,400,000 |  | 2,352,500,000 |
Results of operations before taxes | [1] | 350,600,000 |  | 257,000,000 |  | (1,221,100,000) |
Income tax expense (benefit) | [1] | 126,400,000 |  | 85,900,000 |  | (567,900,000) |
Results of operations | [1] | 224,200,000 |  | 171,100,000 |  | (653,200,000) |
Malaysia [Member] | Crude Oil and Natural Gas Liquids [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 639,900,000 |  | 623,700,000 |  | 790,600,000 |
Malaysia [Member] | Natural Gas [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 138,200,000 |  | 127,600,000 |  | 185,400,000 |
Other Regions [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Other operating revenues | [1] |  |  | 200,000 |  |  |
Total revenues | [1] |  |  | 200,000 |  |  |
Costs and expenses |  |  |  |  |  |  |
Exploration costs charged to expense | [1] | 50,300,000 |  | 43,600,000 |  | 99,000,000 |
Undeveloped lease amortization | [1] |  |  | 500,000 |  | 1,800,000 |
Depreciation, depletion and amortization | [1] | 3,800,000 |  | 5,900,000 |  | 6,200,000 |
Selling and general expenses | [1] | 19,600,000 |  | 33,600,000 |  | 56,800,000 |
Other expenses (benefits) | [1] |  |  | (9,900,000) |  | 12,100,000 |
Total costs and expenses | [1] | 73,700,000 |  | 73,700,000 |  | 175,900,000 |
Results of operations before taxes | [1] | (73,700,000) |  | (73,500,000) |  | (175,900,000) |
Income tax expense (benefit) | [1] | (36,200,000) |  | (18,800,000) |  | (17,300,000) |
Results of operations | [1] | $ (37,500,000) |  | $ (54,700,000) |  | $ (158,600,000) |
[1] | Results exclude corporate overhead, interest and discontinued operations.
[2] | Reclassified to conform to current presentation (see Note A).

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