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Pension and Savings Plans - Components of Net Periodic Pension Cost (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 0.1	$ 0.1	$ 0.2
Interest cost on projected benefit obligation	20.1	21.4	20.4
Expected return on plan assets	(17.6)	(23.8)	(22.9)
Settlement	(2.2)	0.0	0.0
Net actuarial gain	0.0	20.6	12.7
Net periodic postretirement benefit credit	$ 0.4	$ 18.3	$ 10.4

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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