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Revenue Recognition - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accounts receivable, credit loss expense (reversal) |  | $ 0 |  | $ 0 |
Revenue | $ 1,321,900,000 | 723,400,000 | $ 2,013,300,000 | 1,374,700,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue | 1,321,900,000 | 723,400,000 | 2,013,300,000 | 1,374,700,000 |
Corporate and Other (1) |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | (21,400,000) | (2,400,000) | (356,800,000) | 7,300,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue | (21,400,000) | (2,400,000) | (356,800,000) | 7,300,000 |
Designated as Hedging Instrument |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Unrealized loss recognized in income on derivatives | (31,400,000) | (21,100,000) | (318,300,000) | (33,600,000) |
Trade receivables |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Accounts receivable, allowance for credit loss | 0 |  | 0 |  | $ 0
Accounts receivable, allowance for credit loss | 0 |  | 0 |  | 0
Miscellaneous Receivables |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Accounts receivable, allowance for credit loss | 0 |  | 0 |  | 0
Accounts receivable, allowance for credit loss | 0 |  | 0 |  | $ 0
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Unrealized loss recognized in income on derivatives | $ (24,500,000) | $ (23,700,000) | $ (325,500,000) | $ (25,600,000) |

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