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Business Segments - Segment Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest | $ (54,400,000) | $ 1,111,700,000 | $ 123,200,000 | $ 72,800,000 | $ 111,800,000 |  | $ 93,900,000 | $ 45,500,000 | $ 168,300,000 | $ 1,253,302,000 | $ 419,486,000 | [1],[2] | $ (311,789,000) | [1],[2]
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,829,053,000 | 1,791,401,000 | [1] | 1,443,988,000 | [1]
Interest and other income (loss) |  |  |  |  |  |  |  |  |  | (22,520,000) | 7,774,000 | [1] | (78,302,000) | [1]
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | (219,275,000) | (180,359,000) | [1] | (178,263,000) | [1]
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 14,683,000 | (126,136,000) | [1] | 270,131,000 | [1]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 1,147,842,000 | 775,614,000 | [1],[2] | 751,878,000 | [1],[2]
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 40,506,000 | 27,119,000 | [1],[2] | 25,282,000 | [1],[2]
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  | 28,000,000.0 | 40,100,000 |  | 61,800,000 |
Impairment of assets |  |  |  |  |  |  |  |  |  | 0 | 20,000,000 | [1],[2] | 0 | [1],[2]
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 28,500,000 | (183,200,000) |  | 264,100,000 |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 2,560,800,000 | 1,894,500,000 |  | 870,800,000 |
Total assets at year-end | 11,718,504,000 |  |  |  | 11,052,587,000 | [2] |  |  |  | 11,718,504,000 | 11,052,587,000 | [2] | 9,860,900,000 |
Mark to market of crude contracts |  |  |  |  |  |  |  |  |  | (227,000) | (54,000) | [2] | (127,434,000) | [2]
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,370,400,000 | 1,300,300,000 |  | 958,300,000 |
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 447,100,000 | 468,900,000 |  | 485,700,000 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 11,600,000 | 22,200,000 |  | 0 |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  |  | 1,064,500,000 | 250,300,000 |  | 241,200,000 |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Interest and other income (loss) |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 0 | 138,600,000 |  | 16,000,000.0 |
Total assets at year-end | 16,700,000 |  |  |  | 1,691,200,000 |  |  |  |  | 16,700,000 | 1,691,200,000 |  | 1,693,000,000.0 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,829,100,000 | 1,791,400,000 |  | 1,444,000,000.0 |
Exploration and Production |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  |  | 460,600,000 | 277,400,000 |  | 66,100,000 |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,825,600,000 | 1,825,400,000 |  | 1,429,800,000 |
Interest and other income (loss) |  |  |  |  |  |  |  |  |  | (15,800,000) | 0 |  | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | (500,000) | 200,000 |  | 0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 100,300,000 | 57,300,000 |  | 7,400,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 1,125,200,000 | 755,400,000 |  | 735,300,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 40,500,000 | 27,100,000 |  | 25,300,000 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  | 28,000,000.0 | 40,100,000 |  | 61,800,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 112,400,000 | 58,900,000 |  | 21,600,000 |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 2,547,200,000 | 1,733,200,000 |  | 840,000,000.0 |
Total assets at year-end | 10,655,600,000 |  |  |  | 8,242,900,000 |  |  |  |  | 10,655,600,000 | 8,242,900,000 |  | 7,066,200,000 |
Exploration and Production | United States |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  |  | 518,400,000 | 242,900,000 |  | (8,900,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,367,000,000.0 | 1,332,700,000 |  | 944,300,000 |
Interest and other income (loss) |  |  |  |  |  |  |  |  |  | (13,400,000) | 0 |  | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 115,600,000 | 68,100,000 |  | (800,000) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 878,700,000 | 519,500,000 |  | 546,100,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 34,400,000 | 19,500,000 |  | 17,400,000 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  | 23,100,000 | 36,800,000 |  | 60,200,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 111,800,000 | 68,100,000 |  | 2,500,000 |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 2,193,300,000 | 1,343,500,000 |  | 534,800,000 |
Total assets at year-end | 8,043,300,000 |  |  |  | 6,342,900,000 |  |  |  |  | 8,043,300,000 | 6,342,900,000 |  | 5,186,200,000 |
Exploration and Production | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  |  | (4,300,000) | 51,100,000 |  | 112,500,000 |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 447,000,000.0 | 470,500,000 |  | 485,500,000 |
Interest and other income (loss) |  |  |  |  |  |  |  |  |  | (1,500,000) | 0 |  | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | (100,000) | 0 |  | 0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (2,900,000) | 14,500,000 |  | 44,400,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 243,000,000.0 | 232,400,000 |  | 185,400,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 6,100,000 | 7,600,000 |  | 7,900,000 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  | 1,300,000 | 800,000 |  | 1,600,000 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | 14,000,000.0 | 16,500,000 |  | 55,300,000 |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 284,100,000 | 373,800,000 |  | 267,600,000 |
Total assets at year-end | 2,303,700,000 |  |  |  | 1,711,900,000 |  |  |  |  | 2,303,700,000 | 1,711,900,000 |  | 1,725,800,000 |
Exploration and Production | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  |  | (53,500,000) | (16,600,000) |  | (37,500,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 11,600,000 | 22,200,000 |  | 0 |
Interest and other income (loss) |  |  |  |  |  |  |  |  |  | (900,000) | 0 |  | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | (400,000) | 200,000 |  | 0 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (12,400,000) | (25,300,000) |  | (36,200,000) |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 3,500,000 | 3,500,000 |  | 3,800,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  | 3,600,000 | 2,500,000 |  | 0 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | (13,400,000) | (25,700,000) |  | (36,200,000) |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 69,800,000 | 15,900,000 |  | 37,600,000 |
Total assets at year-end | 308,600,000 |  |  |  | 188,100,000 |  |  |  |  | 308,600,000 | 188,100,000 |  | 154,200,000 |
Corporate and other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  |  | (271,800,000) | (108,200,000) |  | (619,100,000) |
Revenues from external customers |  |  |  |  |  |  |  |  |  | 3,500,000 | (34,000,000.0) |  | 14,200,000 |
Interest and other income (loss) |  |  |  |  |  |  |  |  |  | (6,700,000) | 7,800,000 |  | (78,300,000) |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  |  | (218,800,000) | (180,600,000) |  | (178,300,000) |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (85,600,000) | (183,400,000) |  | 262,700,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 22,600,000 | 20,200,000 |  | 16,600,000 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Deferred and noncurrent income taxes |  |  |  |  |  |  |  |  |  | (83,900,000) | (242,100,000) |  | 242,500,000 |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  |  | 13,600,000 | 22,700,000 |  | 14,800,000 |
Total assets at year-end | $ 1,046,200,000 |  |  |  | $ 1,118,500,000 |  |  |  |  | $ 1,046,200,000 | $ 1,118,500,000 |  | $ 1,101,700,000 |
[1] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.
[2] | Reclassified to conform with current presentation (see Note E)

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- Definition The expense charged against earnings for the periodic recognition of capitalized leases. This element may apply to energy companies that lease mineral producing properties and to other enterprises that capitalize property, plant, or equipment obtained through capital leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45031-112735 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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