Retirement Benefits - Estimated OPEB Future Benefit Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Retirement benefits other than pension
Estimated Future Benefits Payments [Line Items]
2024	$ 28.1
2025	27.2
2026	26.4
2027	25.7
2028	25.1
2029 through 2033	113.7
UMWA Plans
Estimated Future Benefits Payments [Line Items]
2024	18.5
2025	18.3
2026	18.1
2027	18.0
2028	17.9
2029 through 2033	83.2
Black Lung and Other Plans
Estimated Future Benefits Payments [Line Items]
2024	9.6
2025	8.9
2026	8.3
2027	7.7
2028	7.2
2029 through 2033	$ 30.5

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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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