Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 4.2	$ 1.8
Expected contributions in next twelve months	4.2
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2023	20.2
2024	19.9
2025	19.9
2026	20.0
2027	19.7
2028 – 2032	97.4
OPEB
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	5.9	$ 5.9
Expected contributions in next twelve months	6.1
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2023	6.1
2024	6.2
2025	6.1
2026	6.0
2027	6.0
2028 – 2032	$ 28.8

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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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