Retirement Benefits - Estimated OPEB Future Ben Pmts (Details) $ in Millions	Dec. 31, 2021 USD ($)
Retirement benefits other than pension
Estimated Future Benefits Payments [Line Items]
2022	$ 36.8
2023	36.0
2024	35.1
2025	34.3
2026	33.3
2027 through 2031	152.8
UMWA Plans
Estimated Future Benefits Payments [Line Items]
2022	26.6
2023	26.5
2024	26.2
2025	26.0
2026	25.6
2027 through 2031	121.3
Black Lung and Other Plans
Estimated Future Benefits Payments [Line Items]
2022	10.2
2023	9.5
2024	8.9
2025	8.3
2026	7.7
2027 through 2031	$ 31.5

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://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.

+ References

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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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