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Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 3,318.3 | $ 2,881.1 | $ 4,623.4
Designated as Hedging Instrument |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized (loss) gain recognized in income on derivatives | (121.1) | (27.4) | 51.8
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized (loss) gain recognized in income on derivatives | (113.7) | (34.5) | 50.6
Seaborne Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 934.0 | 711.8 | 971.7
Seaborne Metallurgical Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 727.7 | 486.5 | 1,033.1
Powder River Basin Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 971.2 | 991.1 | 1,228.7
Other U.S. Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 689.1 | 707.3 | 1,309.4
Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (3.7) | (15.6) | 80.5
Thermal coal |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,583.1 | 2,379.4 | 3,464.7
Thermal coal | Seaborne Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 932.5 | 710.3 | 970.3
Thermal coal | Seaborne Metallurgical Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Thermal coal | Powder River Basin Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 970.7 | 993.9 | 1,208.9
Thermal coal | Other U.S. Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 679.9 | 675.2 | 1,285.5
Thermal coal | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Thermal coal | Domestic |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,814.1 | 1,814.6 | 2,631.0
Thermal coal | Domestic | Seaborne Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 173.5 | 145.5 | 147.9
Thermal coal | Domestic | Seaborne Metallurgical Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Thermal coal | Domestic | Powder River Basin Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 970.7 | 993.9 | 1,208.9
Thermal coal | Domestic | Other U.S. Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 669.9 | 675.2 | 1,274.2
Thermal coal | Domestic | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Thermal coal | Export |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 769.0 | 564.8 | 833.7
Thermal coal | Export | Seaborne Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 759.0 | 564.8 | 822.4
Thermal coal | Export | Seaborne Metallurgical Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Thermal coal | Export | Powder River Basin Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Thermal coal | Export | Other U.S. Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 10.0 | 0.0 | 11.3
Thermal coal | Export | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 719.8 | 484.3 | 1,030.0
Metallurgical coal | Seaborne Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal | Seaborne Metallurgical Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 719.8 | 484.3 | 1,030.0
Metallurgical coal | Powder River Basin Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal | Other U.S. Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal | Export |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 719.8 | 484.3 | 1,030.0
Metallurgical coal | Export | Seaborne Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal | Export | Seaborne Metallurgical Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 719.8 | 484.3 | 1,030.0
Metallurgical coal | Export | Powder River Basin Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal | Export | Other U.S. Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Metallurgical coal | Export | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Other (2) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 15.4 | 17.4 | 128.7
Other (2) | Seaborne Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1.5 | 1.5 | 1.4
Other (2) | Seaborne Metallurgical Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7.9 | 2.2 | 3.1
Other (2) | Powder River Basin Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.5 | (2.8) | 19.8
Other (2) | Other U.S. Thermal Mining |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 9.2 | 32.1 | 23.9
Other (2) | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (3.7) | (15.6) | 80.5
Trading and Brokerage Coal Deliveries |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | (28.5) | (18.8)
Trading and Brokerage Coal Deliveries | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 139.5 | (28.9) | (17.6)
Coal |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 3,442.0 | $ 2,835.0 | $ 4,477.0

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