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Other Postretirement Benefit Plans - Schedule of Changes in Prior Service Cost Recognized in Accumulated Other Comprehensive Loss (Income) (Details) - Postretirement Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes to prior service credit recognized in accumulated other comprehensive loss:
Accumulated other comprehensive loss at beginning of year	$ (63.6)	$ (71.9)
Recognized prior service credit	8.2	8.3
Accumulated other comprehensive loss (income) at end of year	$ (55.4)	$ (63.6)

X

- Definition

Defined Benefit Plan, Change in Plan Assets and Benefit Obligations Recognized in Accumulated Other Comprehensive Income (Loss) [Roll Forward]

+ References

No definition available.

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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- Definition

Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.

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