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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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- Definition 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 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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