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Asset Impairment Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2016
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Carrying Value of Australian Metallurgical Assets | $ 4,679.1 |  |  | $ 5,111.9 | $ 4,679.1 | $ 5,207.0 |
Asset impairment charges | 250.2 | $ 20.0 | $ 30.5 | 0.0 | 270.2 | 0.0 |
Equity method investment |  |  | 0.0 | 0.0 | 9.0 | 0.0 |
Western U.S. Mining |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | 172.0 |  |
Midwestern U.S. Mining |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | 20.0 |  |
Corporate and Other |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Carrying Value of Australian Metallurgical Assets | 291.3 |  |  | $ 249.2 | 291.3 | $ 365.3 |
Impairment to Unallocated Coal Reserves |  |  |  |  | 69.2 |  |
Midwestern U.S. Mining and Corporate and Other [Domain] |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Long-Lived Assets | $ 89.0 |  |  |  | $ 89.0 |  |
Metropolitan Collieries Pty Ltd |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Planned Divestiture, Agreed Upon Proceeds from Divestiture |  |  |  |  |  |  | $ 200.0
Contract Termination | Midwestern U.S. Mining |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |  |
Asset impairment charges |  |  | $ 30.5 |  |  |  |

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