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Property, Plant, Equipment and Mine Development - (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Property, Plant, Equipment and Mine Development[Line Items] |  |
Less: Accumulated depreciation, depletion and amortization | $ (1,480,500,000) | $ (1,321,300,000)
Property, plant, equipment and mine development, net | 2,950,600,000 | 3,051,100,000
Coal reserves | 1,400,000,000 | 1,500,000,000
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 | 800,000,000 | 800,000,000
Land and coal interests |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, plant equipment and mine development, gross | 2,494,100,000 | 2,482,900,000
Buildings and improvements |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, plant equipment and mine development, gross | 550,800,000 | 481,000,000.0
Machinery and equipment |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Property, plant equipment and mine development, gross | 1,386,500,000 | 1,408,500,000
Coal Reserves Held by Fee Ownership |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |
Coal reserves | $ 600,000,000 | $ 700,000,000

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