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Property, Plant, Equipment and Mine Development - (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property, Plant, Equipment and Mine Development[Line Items]
Less: Accumulated depreciation, depletion and amortization	$ (2,673.8)	$ (2,372.5)
Property, plant, equipment and mine development, net	3,153.3	3,081.5
Coal reserves	1,100.0	1,100.0
Coal reserves not subject to depletion	100.0	100.0
Other U.S. Thermal
Property, Plant, Equipment and Mine Development[Line Items]
At-risk assets	64.0
Land and coal interests
Property, Plant, Equipment and Mine Development[Line Items]
Property, plant equipment and mine development, gross	2,691.2	2,648.5
Buildings and improvements
Property, Plant, Equipment and Mine Development[Line Items]
Property, plant equipment and mine development, gross	758.8	726.7
Machinery and equipment
Property, Plant, Equipment and Mine Development[Line Items]
Property, plant equipment and mine development, gross	2,377.1	2,078.8
Coal Reserves Held by Fee Ownership
Property, Plant, Equipment and Mine Development[Line Items]
Coal reserves	500.0	500.0
Coal reserves and resources comprised of mineral rights for leased coal interests and advance royalties
Property, Plant, Equipment and Mine Development[Line Items]
Coal reserves	$ 600.0	$ 600.0

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At-risk assets

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Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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