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Other Postretirement Benefit Plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Details) - Postretirement Plan - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized in accumulated other comprehensive loss:
Net prior service credit	$ (55.4)	$ (63.6)
Accumulated other comprehensive loss	$ (55.4)	$ (63.6)	$ (71.9)

X

- 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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- References

No definition available.

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
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