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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1.9	$ 1.8
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1.9	1.8
Expected contributions in next twelve months	1.8
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021	20.8
2022	20.9
2023	20.6
2024	20.3
2025	20.2
2026-2030	99.7
OPEB
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	5.8	$ 5.8
Expected contributions in next twelve months	6.4
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021	6.4
2022	6.4
2023	6.3
2024	6.3
2025	6.2
2026-2030	$ 30.1

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