Pension and Postretirement Plans - Expected Future Benefit Payments (Details) $ in Millions	Dec. 31, 2021 USD ($)
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt [Abstract]
2022	$ (0.2)
2023	(0.1)
2024	(0.1)
2025	(0.1)
2026	(0.1)
Years 2027 - 2031	(0.3)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	54.2
2023	51.0
2024	49.7
2025	48.9
2026	44.6
Years 2027 - 2031	186.6
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	8.0
2023	7.6
2024	7.3
2025	6.9
2026	6.6
Years 2027 - 2031	$ 29.2

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

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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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Amount of prescription drug subsidy receipt expected after fifth fiscal year following current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of prescription drug subsidy receipt expected in next fiscal year following current fiscal year.

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Amount of prescription drug subsidy receipt expected in fifth fiscal year following current fiscal year.

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Amount of prescription drug subsidy receipt expected in fourth fiscal year following current fiscal year.

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Amount of prescription drug subsidy receipt expected in third fiscal year following current fiscal year.

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Amount of prescription drug subsidy receipt expected in second fiscal year following current fiscal year.

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