Pension and Savings Plans - Change in Benefit Obligation, Plan Assets and Funded Status of Pension Plans (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in benefit obligation:
Projected benefit obligation at beginning of period	$ 125.2	$ 580.9
Service cost	0.1	0.1	$ 0.1
Interest cost	6.5	20.1	21.4
Benefits Paid and Administrative Fees	(10.7)	(36.1)
Actuarial (gain) loss	(3.5)	3.4
Settlement	0.0	(443.2)
Projected benefit obligation at end of period	117.6	125.2	580.9
Change in plan assets:
Fair value of plan assets at beginning of period	116.0	583.3
Actual return on plan assets	(0.5)	23.1
Employer contributions	0.0	(11.1)
Benefits paid	(10.7)	(36.1)
Settlement	0.0	(443.2)
Fair value of plan assets at end of period	104.8	116.0	$ 583.3
Funded status at end of period	(12.8)	(9.2)
Amounts recognized in the consolidated balance sheets:
Noncurrent obligation (included in “Other noncurrent liabilities”)	$ 12.8	$ 9.2

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

Name:	us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1