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Asset Impairment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges	$ 11.2	$ 0.0	$ 1,487.4
Asset impairment of property, plant and equipment and mine development assets	9.5	$ 0.0	1,487.4
Impairment to unallocated coal reserves			69.3
Equity Securities
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges	1.7
Land
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges	$ 9.5
Powder River Basin Mining
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment charges			1,418.1
Asset impairment of property, plant and equipment and mine development assets			1,393.7
Operating lease right-of-use assets impairment			19.9
Impairment of contract-based intangible assets			$ 4.5

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Impairment Of Unallocated Coal Reserves

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Amount of loss from impairment of right-of-use asset from operating lease.

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