Retirement Plans - Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)
Net actuarial (gain) loss	$ (4.2)	$ (2.0)
Prior service cost (credit)	0.9	1.3
Accumulated other comprehensive (income) loss, before taxes	(3.3)	(0.7)
Accumulated other comprehensive (income) loss, after taxes	(2.5)	(0.5)
Pensions
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)
Net actuarial (gain) loss	(4.2)	(2.0)
Prior service cost (credit)	1.0	1.4
Accumulated other comprehensive (income) loss, before taxes	(3.2)	(0.6)
Accumulated other comprehensive (income) loss, after taxes	(2.4)	(0.4)
Other Benefits
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)
Net actuarial (gain) loss	0.0	0.0
Prior service cost (credit)	(0.1)	(0.1)
Accumulated other comprehensive (income) loss, before taxes	(0.1)	(0.1)
Accumulated other comprehensive (income) loss, after taxes	$ (0.1)	$ (0.1)

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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

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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.

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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).

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