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v3.23.1

Revenue Recognition - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable, credit loss expense (reversal) |  | $ 0 |
Revenue | $ 1,364,000,000 | 691,400,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue | 1,364,000,000 | 691,400,000 |
Corporate and Other (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 174,400,000 | (335,400,000) |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue | 174,400,000 | (335,400,000) |
Designated as Hedging Instrument |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 99,200,000 | (286,900,000) |
Trade receivables |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Accounts receivable, allowance for credit loss | 0 |  | $ 0
Accounts receivable, allowance for credit loss | 0 |  | 0
Miscellaneous Receivables |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Accounts receivable, allowance for credit loss | 0 |  | 0
Accounts receivable, allowance for credit loss | 0 |  | $ 0
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | $ 118,700,000 | $ (301,000,000.0) |

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