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Revenue Recognition - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Contract with customer, liability | $ 5,300,000,000 |  |
Accounts receivable, credit loss expense (reversal) | 0 |  | $ (4,400,000)
Revenues | 3,318,300,000 | $ 2,881,100,000 | 4,623,400,000
Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ (3,700,000) | (15,600,000) | 80,500,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, percentage | 46.00% |  |
Revenue, remaining performance obligation, period | 12 months |  |
Other (2) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 15,400,000 | 17,400,000 | 128,700,000
Other (2) | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (3,700,000) | (15,600,000) | 80,500,000
Trading and Brokerage Coal Deliveries |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | (28,500,000) | (18,800,000)
Trading and Brokerage Coal Deliveries | Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 139,500,000 | (28,900,000) | $ (17,600,000)
Trade Accounts Receivable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable, allowance for credit losses | 0 | 0 |
Miscellaneous Receivables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable, allowance for credit losses | $ 800,000,000 | $ 800,000,000 |

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