Retirement Benefits - Estimated OPEB Future Benefit Payments (Details) $ in Millions	Dec. 31, 2022 USD ($)
Retirement benefits other than pension
Estimated Future Benefits Payments [Line Items]
2023	$ 29.6
2024	28.9
2025	28.2
2026	27.4
2027	26.8
2028 through 2032	123.5
UMWA Plans
Estimated Future Benefits Payments [Line Items]
2023	20.0
2024	19.9
2025	19.8
2026	19.6
2027	19.5
2028 through 2032	92.8
Black Lung and Other Plans
Estimated Future Benefits Payments [Line Items]
2023	9.6
2024	9.0
2025	8.4
2026	7.8
2027	7.3
2028 through 2032	$ 30.7

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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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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