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Supplemental Oil and Gas Information - Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves (Details) $ in Millions | 12 Months Ended |
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Dec. 31, 2019 USD ($) $ / Mcf | Dec. 31, 2018 USD ($) $ / Mcf | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | $ 28,533.4 | $ 34,423.0 | $ 21,992.1 |
Future development costs | (4,861.8) | (5,159.2) | (3,793.5) |
Future production costs | (11,566.0) | (12,785.9) | (9,577.7) |
Future income taxes | (2,137.9) | (2,924.9) | (1,287.0) |
Future net cash flows | 9,967.7 | 13,553.0 | 7,333.9 |
10% annual discount for estimated timing of cash flows | (4,140.1) | (5,273.1) | (3,411.0) |
Net changes in prices and production costs | (2,993.9) | 2,972.6 | 2,428.4 |
Net changes in development costs | (675.7) | (1,891.1) | (724.4) |
Sales and Transfers of Oil and Gas Produced, Net of Production Costs | 2,163.8 | 1,978.6 | 1,576.0 |
Net change due to extensions and discoveries | 1,221.9 | 1,930.3 | 807.9 |
Increase Decrease Due To Purchases And Sales Of Minerals In Place | 628.1 | (3,152.4) | (85.9) |
Development costs incurred | 1,282.4 | 1,017.3 | 802.7 |
Accretion of discount | 1,002.0 | 469.5 | 270.9 |
Revisions of previous quantity estimates | (71.2) | (347.8) | (109.5) |
Net change in income taxes | 574.1 | (967.6) | (643.0) |
Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Period Increase (Decrease) | (2,452.3) | 4,357.0 | 1,342.9 |
Standardized measure of discounted future net cash flows | 5,827.6 | 8,279.9 | 3,922.9 | $ 2,580.0
United States |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 23,565.6 | 23,473.9 | 12,885.8 |
Future development costs | (4,137.8) | (3,279.1) | (2,079.5) |
Future production costs | (8,986.2) | (7,279.5) | (4,765.3) |
Future income taxes | (1,709.3) | (2,216.5) | (893.7) |
Future net cash flows | 8,732.3 | 10,698.8 | 5,147.3 |
10% annual discount for estimated timing of cash flows | (3,633.1) | (4,295.4) | (2,698.2) |
Standardized measure of discounted future net cash flows | 5,099.2 | 6,403.4 | 2,449.1 |
Canada |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 4,912.1 | 5,437.5 | 4,714.3 |
Future development costs | (723.7) | (1,362.7) | (1,081.7) |
Future production costs | (2,549.9) | (2,693.0) | (2,507.4) |
Future income taxes | (414.5) | (236.4) | (161.1) |
Future net cash flows | 1,224.0 | 1,145.4 | 964.1 |
10% annual discount for estimated timing of cash flows | (504.0) | (531.4) | (394.6) |
Standardized measure of discounted future net cash flows | 720.0 | 614.0 | 569.5 |
Malaysia & Other |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 55.7 | 5,511.6 | 4,392.0 |
Future development costs | (0.3) | (517.4) | (632.3) |
Future production costs | (29.9) | (2,813.4) | (2,305.0) |
Future income taxes | (14.1) | (472.0) | (232.2) |
Future net cash flows | 11.4 | 1,708.8 | 1,222.5 |
10% annual discount for estimated timing of cash flows | (3.0) | (446.3) | (318.2) |
Standardized measure of discounted future net cash flows | $ 8.4 | $ 1,262.5 | $ 904.3 |
Net natural gas revenue |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Average production costs per volume of natural gas (in dollars per cubic foot) | $ / Mcf | 2.57 | 3.10 |  |

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