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Other Events (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Commercial Events [Line Items] |  |  |  |  |
Interest in unincorporated joint venture project |  | 50.00% |  |  |
Contribution to construction and development of joint venture |  | $ 59.0 | $ 72.0 |  |
Gain on formation of United Wambo Joint Venture |  | 0.0 | 0.0 | $ (48.1) |
Revenues |  | 3,318.3 | 2,881.1 | 4,623.4 |
Provision for equipment loss |  | 0.0 | 0.0 | 83.2 | $ 66.4
Insurance recovery |  | 0.0 | 0.0 | 125.0 |
Proceeds from disposal of assets, net of receivables |  | 17.8 | 27.1 | 30.0 |
Gain on disposition of assets |  | 31.5 | 15.2 | 2.1 |
Mine Reclamation and Closing Liability, Noncurrent |  | 9.4 |  |  |
Restructuring charges |  | 8.3 | 37.9 | 24.3 |
North Goonyella Mine |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Costs related to north goonyella events |  |  |  | 111.5 |
Containment and idling costs |  | 13.0 | 32.3 |  |
Insurance recovery | $ 125.0 |  | $ 125.0 |  |
North Goonyella Mine | Mine Carrying Value |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Costs related to north goonyella events |  |  |  | $ 300.0 |
Millennium Mine |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | 26.1 |  |  |
Wilkie Creek Mine |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | $ 24.6 |  |  |

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