Post Retirement Benefit Plans - AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pre-tax amounts recognized in accumulated other comprehensive income:
Prior service cost	$ 0.2	$ 14.6	$ 12.0
Net actuarial gain (loss)	(38.9)	(27.4)	4.2
Accumulated other comprehensive gain (loss)	(38.7)	(12.8)	16.2
Accumulated contributions in excess of net periodic benefit cost	(66.8)	(65.9)	(63.7)
Net amount recognized	(105.5)	$ (78.7)	$ (47.5)
Accumulated other comprehensive income expected to be recognized as amortization of net loss within net periodic benefit cost in 2024	$ 0.4

Defined benefit plan, amounts for asset (liability) recognized in statement of comprehensive income.

No definition available.

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- Definition

The cumulative employer contributions in excess of net periodic benefit cost for defined benefit plans.

+ 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Publisher FASB
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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- References

No definition available.

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- Definition

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

+ References

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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

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- Definition

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 20
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-Section 50
-Paragraph 1
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