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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1.8	$ 1.9
Expected contributions in next twelve months	4.2
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	20.7
2023	20.4
2024	20.1
2025	20.0
2026	20.1
2027 – 2031	97.6
OPEB
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	5.9	$ 5.8
Expected contributions in next twelve months	6.3
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	6.3
2023	6.2
2024	6.2
2025	6.1
2026	6.0
2027 – 2031	$ 29.6

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