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Revenue Recognition - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Contract with customer, liability | $ 6,300,000,000 |  |
Accounts receivable, credit loss expense (reversal) | 0 | $ 0 | $ 0
Revenues | 4,981,900,000 | 3,318,300,000 | 2,881,100,000
Other Income | 11,200,000 | 10,600,000 | 9,000,000.0
Designated as Hedging Instrument |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total (loss) gain recognized in income | (488,600,000) | (160,300,000) | 16,900,000
(Loss) gain realized in income on derivatives | (460,100,000) | (39,200,000) | 44,300,000
Unrealized (loss) gain recognized in income on derivatives | (28,500,000) | (121,100,000) | (27,400,000)
Derivative contracts related to forecasted sales | Designated as Hedging Instrument |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total (loss) gain recognized in income | (490,900,000) | (160,700,000) | 4,700,000
(Loss) gain realized in income on derivatives | (455,100,000) | (45,600,000) | 34,300,000
Unrealized (loss) gain recognized in income on derivatives | (35,800,000) | (115,100,000) | (29,600,000)
Financial trading contracts | Designated as Hedging Instrument |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total (loss) gain recognized in income | 10,700,000 | 6,100,000 | (700,000)
(Loss) gain realized in income on derivatives | 1,100,000 | 4,600,000 | 4,200,000
Unrealized (loss) gain recognized in income on derivatives | 9,600,000 | 1,500,000 | (4,900,000)
Coal Contract and Physical commodity purchase / sale contracts | Designated as Hedging Instrument |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized (loss) gain recognized in income on derivatives | (35,800,000) | (115,100,000) | (29,600,000)
Corporate and Other (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,700,000 | (3,700,000) | (15,600,000)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, percentage | 40.00% |  |
Revenue, remaining performance obligation, period | 12 months |  |
Other (2) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 12,800,000 | 15,400,000 | 17,400,000
Other (2) | Corporate and Other (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,700,000 | (3,700,000) | (15,600,000)
Trading and Brokerage Coal Deliveries | Corporate and Other (1) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 470,700,000 | 140,300,000 | $ (28,600,000)
Miscellaneous Receivables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable, allowance for credit losses | 700,000,000 | 700,000,000 |
Trade Accounts Receivable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable, allowance for credit losses | $ 0 | $ 0 |

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