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Revenue Recognition - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Contract with customer, liability | $ 5,100,000,000 |  |
Accounts receivable, credit loss expense (reversal) |  | $ 0 |
Revenue | $ 691,400,000 | 651,300,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, remaining performance obligation, percentage | 48.00% |  |
Revenue | $ 691,400,000 | 651,300,000 |
Trading and Brokerage Coal Deliveries |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 17,900,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue |  | 17,900,000 |
Coal [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,039,000,000 | 656,000,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue | 1,039,000,000 | 656,000,000 |
Designated as Hedging Instrument |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Unrealized gain (loss) recognized in income on derivatives | (286,900,000) | (12,500,000) |
Unrealized gain (loss) recognized in income on derivatives | (286,900,000) | (12,500,000) |
Corporate and Other (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | (335,400,000) | 9,700,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue | (335,400,000) | 9,700,000 |
Corporate and Other (1) | Trading and Brokerage Coal Deliveries |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 19,000,000 | 17,900,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue | 19,000,000 | 17,900,000 |
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Unrealized gain (loss) recognized in income on derivatives | (290,200,000) | (4,900,000) |
Unrealized gain (loss) recognized in income on derivatives | $ (290,200,000) | $ (4,900,000) |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue, remaining performance obligation, period | 12 months |  |
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

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