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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 6.3	$ 4.2
Expected contributions in next twelve months	4.5
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2024	19.2
2025	19.4
2026	19.5
2027	19.3
2028	19.5
2029 – 2033	95.9
OPEB
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	6.4	$ 5.9
Expected contributions in next twelve months	6.5
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2024	6.5
2025	6.4
2026	6.4
2027	6.4
2028	6.2
2029 – 2033	$ 29.1

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

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