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Property, Plant, Equipment and Mine Development - (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Property, Plant, Equipment and Mine Development[Line Items] |  |
Less: Accumulated depreciation, depletion and amortization | $ (2,066,300,000) | $ (1,787,000,000)
Property, plant, equipment and mine development, net | 2,844,100,000 | 2,865,000,000
Coal reserves | 1,200,000,000 | 1,300,000,000
Coal reserves not subject to depletion | 100,000,000 | 100,000,000
Miscellaneous Receivables |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Accounts receivable, allowance for credit losses | 700,000,000 | 700,000,000
Land and coal interests |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, plant equipment and mine development, gross | 2,475,200,000 | 2,514,700,000
Buildings and improvements |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, plant equipment and mine development, gross | 647,600,000 | 594,200,000
Machinery and equipment |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, plant equipment and mine development, gross | 1,787,600,000 | 1,543,100,000
Coal Reserves Held by Fee Ownership |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Coal reserves | $ 500,000,000 | $ 600,000,000

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