Retirement Benefits - Estimated OPEB Future Benefit Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Retirement benefits other than pension
Estimated Future Benefits Payments [Line Items]
2025	$ 25.3
2026	24.4
2027	23.5
2028	22.7
2029	21.9
2030 through 2034	97.8
UMWA Plans
Estimated Future Benefits Payments [Line Items]
2025	16.2
2026	16.0
2027	15.8
2028	15.7
2029	15.4
2030 through 2034	70.4
Black Lung and Other Plans
Estimated Future Benefits Payments [Line Items]
2025	9.1
2026	8.4
2027	7.7
2028	7.0
2029	6.5
2030 through 2034	$ 27.4

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- Definition

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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