Pension Benefits and Other Postretirement Benefits (Components of Net Periodic Benefit (Credit) Cost) (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.2	$ 0.3	$ 0.7	$ 0.8
Expected return of plan assets	(0.4)	(0.4)	(1.0)	(1.1)
Amortization of net loss (gain)	0.2	0.1	0.4	0.4
Net periodic benefit cost (credit)	$ 0.0	$ 0.0	$ 0.1	$ 0.1

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

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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