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Other Postretirement Benefit Plans (Details) - Postretirement Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Components of net periodic benefit credit:
Interest cost	$ 0.4	$ 0.4	$ 0.8	$ 0.9
Amortization of prior service credit	(2.1)	(2.0)	(4.1)	(4.1)
Net periodic benefit cost	$ (1.7)	$ (1.6)	$ (3.3)	$ (3.2)

X

- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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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