Employee Retirement Plans - Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension (expense) income	$ (0.4)	$ 0.2	$ (1.1)	$ 0.6
Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	(3.9)	(4.1)	(11.5)	(12.3)
Expected return on plan assets	3.8	4.6	11.2	13.6
Net periodic pension (expense) income	(0.1)	0.5	(0.3)	1.3
Amortization of actuarial loss	(0.3)	(0.3)	(0.8)	(0.7)
Net pension (expense) income	$ (0.4)	$ 0.2	(1.1)	$ 0.6
Pension Plans \| Non-qualified
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Benefit payments on non-qualified pension plans			0.3
Pension Plans \| Qualified
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions on qualified pension plans			$ 0.0

Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Amortization Of Gain (Loss)

No definition available.

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- Definition

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

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- Definition

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

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- Definition

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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- Definition

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

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- Definition

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

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- Definition

Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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