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Supplemental Oil and Gas Information (Results of Operations for Oil andGas Producing Activities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | [2] | Dec. 31, 2016
Revenues |  |  |  |  |  |  |
Revenues | [1] | $ 2,586.6 | [2] | $ 2,078.5 |  | $ 1,862.9 | [3]
Other operating revenues | [1] | 18.0 | [2] | 132.4 |  | 5.1 | [3]
Total revenues | [1] | 2,604.6 | [2] | 2,210.9 |  | 1,868.0 | [3]
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [1] | 555.9 | [2] | 468.4 |  | 559.4 | [3]
Severance and ad valorem taxes | [1] | 52.1 | [2] | 43.7 |  | 43.8 | [3]
Exploration costs charged to expense | [1] | 63.8 | [2] | 61.0 |  | 58.5 | [3]
Undeveloped lease amortization | [1] | 40.1 | [2] | 61.8 |  | 43.4 | [3]
Depreciation, depletion and amortization | [1] | 954.0 | [2] | 939.9 |  | 1,037.3 | [3]
Accretion of asset retirement obligations | [1] | 44.6 | [2] | 42.6 |  | 46.7 | [3]
Impairment of assets |  | 20.0 | [2] |  |  | 95.1 | [3]
Redetermination expense |  | 11.3 | [1],[2] | 15.0 |  | 39.1 | [1],[3]
Selling and general expenses | [1] | 110.1 | [2] | 123.7 |  | 131.7 | [3]
Other expenses (benefits) | [1] | 5.2 | [2] | 30.7 |  | 29.6 | [3]
Total costs and expenses | [1] | 1,857.1 | [2] | 1,786.8 |  | 2,084.6 | [3]
Results of operations before taxes | [1] | 747.5 | [2] | 424.1 |  | (216.6) | [3]
Income tax expense (benefit) | [1] | 200.6 | [2] | 133.8 |  | (132.9) | [3]
Results of operations |  | 546.9 | [1],[2] | 290.3 | [1] | (83.7) | [3]
Crude Oil and Natural Gas Liquids [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 2,251.4 | [2] | 1,747.3 |  | 1,570.2 | [3]
Natural Gas [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [1] | 335.2 | [2] | 331.2 |  | 292.7 | [3]
United States [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 1,288.2 | [2] | 941.6 |  | 749.2 | [3]
Other operating revenues |  | 1.4 | [2] | 2.7 |  | (0.1) | [3]
Total revenues |  | 1,289.6 | [2] | 944.3 |  | 749.1 | [3]
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses |  | 230.5 | [2] | 198.5 |  | 218.6 | [3]
Severance and ad valorem taxes |  | 50.9 | [2] | 42.2 |  | 37.0 | [3]
Exploration costs charged to expense |  | 29.4 | [2] | 7.8 |  | 6.1 | [3]
Undeveloped lease amortization |  | 36.8 | [2] | 60.2 |  | 38.4 | [3]
Depreciation, depletion and amortization |  | 519.5 | [2] | 546.1 |  | 600.5 | [3]
Accretion of asset retirement obligations |  | 19.5 | [2] | 17.4 |  | 17.1 | [3]
Impairment of assets | [2] | 20.0 |  |  |  |  |
Selling and general expenses |  | 49.0 | [2] | 61.8 |  | 54.0 | [3]
Other expenses (benefits) |  | 23.0 | [2] | 20.0 |  | 7.3 | [3]
Total costs and expenses |  | 978.6 | [2] | 954.0 |  | 979.0 | [3]
Results of operations before taxes |  | 311.0 | [2] | (9.7) |  | (229.9) | [3]
Income tax expense (benefit) |  | 68.1 | [2] | (0.8) |  | (65.7) | [3]
Results of operations |  | 242.9 | [2] | (8.9) |  | (164.2) | [3]
United States [Member] | Crude Oil and Natural Gas Liquids [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 1,245.3 | [2] | 903.7 |  | 714.1 | [3]
United States [Member] | Natural Gas [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 42.9 | [2] | 37.9 |  | 35.1 | [3]
Canada [Member] | Conventional [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 438.8 | [2] | 358.8 |  | 301.7 | [3]
Other operating revenues |  | (0.2) | [2] | 126.7 |  | (0.7) | [3]
Total revenues |  | 438.6 | [2] | 485.5 |  | 301.0 | [3]
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses |  | 122.6 | [2] | 101.1 |  | 102.6 | [3]
Severance and ad valorem taxes |  | 1.2 | [2] | 1.5 |  | 4.3 | [3]
Exploration costs charged to expense |  | 0.6 | [2] | 0.5 |  | 3.6 | [3]
Undeveloped lease amortization |  | 0.8 | [2] | 1.6 |  | 4.5 | [3]
Depreciation, depletion and amortization |  | 232.4 | [2] | 185.4 |  | 186.7 | [3]
Accretion of asset retirement obligations |  | 7.7 | [2] | 7.9 |  | 10.9 | [3]
Impairment of assets | [3] |  |  |  |  | 95.1 |
Selling and general expenses |  | 26.8 | [2] | 28.3 |  | 28.2 | [3]
Other expenses (benefits) |  | (19.1) | [2] | 2.3 |  | 7.9 | [3]
Total costs and expenses |  | 373.0 | [2] | 328.6 |  | 443.8 | [3]
Results of operations before taxes |  | 65.6 | [2] | 156.9 |  | (142.8) | [3]
Income tax expense (benefit) |  | 14.5 | [2] | 44.4 |  | (58.9) | [3]
Results of operations |  | 51.1 | [2] | 112.5 |  | (83.9) | [3]
Canada [Member] | Synthetic Oil [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [3] |  |  |  |  | 60.7 |
Other operating revenues | [3] |  |  |  |  | 3.6 |
Total revenues | [3] |  |  |  |  | 64.3 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [3] |  |  |  |  | 69.8 |
Severance and ad valorem taxes | [3] |  |  |  |  | 2.5 |
Depreciation, depletion and amortization | [3] |  |  |  |  | 16.5 |
Accretion of asset retirement obligations | [3] |  |  |  |  | 2.4 |
Selling and general expenses | [3] |  |  |  |  | 0.5 |
Total costs and expenses | [3] |  |  |  |  | 91.7 |
Results of operations before taxes | [3] |  |  |  |  | (27.4) |
Income tax expense (benefit) | [3] |  |  |  |  | (75.4) |
Results of operations | [3] |  |  |  |  | 48.0 |
Canada [Member] | Crude Oil and Natural Gas Liquids [Member] | Conventional [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 291.2 | [2] | 203.7 |  | 171.7 | [3]
Canada [Member] | Crude Oil and Natural Gas Liquids [Member] | Synthetic Oil [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [3] |  |  |  |  | 60.7 |
Canada [Member] | Natural Gas [Member] | Conventional [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 147.6 | [2] | 155.1 |  | 130.0 | [3]
Malaysia [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 853.5 | [2] | 778.1 |  | 751.3 | [3]
Other operating revenues |  | 0.7 | [2] | 3.0 |  | 2.1 | [3]
Total revenues |  | 854.2 | [2] | 781.1 |  | 753.4 | [3]
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses |  | 202.1 | [2] | 168.8 |  | 168.4 | [3]
Exploration costs charged to expense |  | 2.2 | [2] | 2.4 |  | 5.2 | [3]
Depreciation, depletion and amortization |  | 198.6 | [2] | 204.6 |  | 227.7 | [3]
Accretion of asset retirement obligations |  | 17.4 | [2] | 17.3 |  | 16.3 | [3]
Redetermination expense |  | 11.3 | [2] | 15.0 |  | 39.1 | [3]
Selling and general expenses |  | 10.8 | [2] | 14.0 |  | 15.4 | [3]
Other expenses (benefits) |  | (1.0) | [2] | 8.4 |  | 24.3 | [3]
Total costs and expenses |  | 441.4 | [2] | 430.5 |  | 496.4 | [3]
Results of operations before taxes |  | 412.8 | [2] | 350.6 |  | 257.0 | [3]
Income tax expense (benefit) |  | 143.3 | [2] | 126.4 |  | 85.9 | [3]
Results of operations |  | 269.5 | [2] | 224.2 |  | 171.1 | [3]
Malaysia [Member] | Crude Oil and Natural Gas Liquids [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 708.8 | [2] | 639.9 |  | 623.7 | [3]
Malaysia [Member] | Natural Gas [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues |  | 144.7 | [2] | 138.2 |  | 127.6 | [3]
Other Regions [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [2] | 6.1 |  |  |  |  |
Other operating revenues |  | 16.1 | [2] |  |  | 0.2 | [3]
Total revenues |  | 22.2 | [2] |  |  | 0.2 | [3]
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | [2] | 0.7 |  |  |  |  |
Exploration costs charged to expense |  | 31.6 | [2] | 50.3 |  | 43.6 | [3]
Undeveloped lease amortization |  | 2.5 | [2] |  |  | 0.5 | [3]
Depreciation, depletion and amortization |  | 3.5 | [2] | 3.8 |  | 5.9 | [3]
Selling and general expenses |  | 23.5 | [2] | 19.6 |  | 33.6 | [3]
Other expenses (benefits) |  | 2.3 | [2] |  |  | (9.9) | [3]
Total costs and expenses |  | 64.1 | [2] | 73.7 |  | 73.7 | [3]
Results of operations before taxes |  | (41.9) | [2] | (73.7) |  | (73.5) | [3]
Income tax expense (benefit) |  | (25.3) | [2] | (36.2) |  | (18.8) | [3]
Results of operations |  | (16.6) | [2] | $ (37.5) |  | $ (54.7) | [3]
Other Regions [Member] | Crude Oil and Natural Gas Liquids [Member] |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Revenues | [2] | $ 6.1 |  |  |  |  |
[1] | 1 Results exclude corporate overhead, interest and discontinued operations. 2018 includes noncontrolling interest in MP GOM.
[2] | Results exclude corporate overhead, interest and discontinued operations. 2018 includes noncontrolling interest in MP GOM.
[3] | Results exclude corporate overhead, interest and discontinued operations.

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