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Pension and Other Postemployment Benefits (Tables)
 12 Months Ended
Dec. 31, 2024
Pension and Other Postemployment Benefits [Abstract]  
Net Periodic Benefit Expense
Pension and other postemployment benefits net periodic benefit expense:
Defined Benefit Pension PlansPostemployment Arrangements
Year Ended December 31,Year Ended December 31,
202420232022202420232022
Service cost$1.6 $2.4 $2.8 $2.9 $3.4 $4.5 
Interest cost8.5 11.1 5.6 5.9 5.7 2.6 
Expected return on plan assets(2.2)(0.3)(1.4)— — — 
Amortization of prior service cost0.4 0.3 0.4 4.4 3.8 3.8 
Amortization of actuarial loss0.8 0.7 4.0 0.2 — 2.5 
Net Periodic Benefit Expense$9.1 $14.2 $11.4 $13.4 $12.9 $13.4 
Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense
Weighted average assumptions:
Defined Benefit Pension PlansPostemployment Arrangements
Year Ended December 31,Year Ended December 31,
202420232022202420232022
Discount rate4.5 %4.7 %2.1 %4.5 %4.7 %1.8 %
Compensation increases3.4 %2.6 %2.6 %3.5 %3.5 %3.5 %
Expected return on plan assets2.2 %1.5 %1.6 %
Change in Benefit Obligation, Fair Value of Plan Assets, Funded Status and Balance Sheet Classification of Defined Benefit Pension Plans
Change in benefit obligation and fair value of plan assets:
Defined Benefit Pension PlansPostemployment Arrangements
Year Ended December 31,Year Ended December 31,
2024202320242023
Benefit obligation:
Benefit obligation, January 1$224.3 $228.6 $142.2 $130.8 
Service cost1.6 2.4 2.9 3.4 
Interest cost8.5 11.1 5.9 5.7 
Amendments, curtailments and settlements16.1 (0.4)(0.6)6.9 
Actuarial (gain) loss(23.1)(2.1)(12.4)6.3 
Benefits paid(11.7)(12.4)(11.4)(10.9)
Foreign currency translation0.3 (2.9)— — 
Benefit obligation, December 31$216.0 $224.3 $126.6 $142.2 
Fair value of plan assets:
Fair value of plan assets, January 1$45.5 $44.0 $— $— 
Actual return on plan assets2.0 3.9 — — 
Employer contributions10.6 8.8 — — 
Benefits paid(11.7)(12.4)— — 
Foreign currency translation and other(0.5)1.2 — — 
Fair value of plan assets, December 31$45.9 $45.5 $— $— 
Funded status, December 31$(170.1)$(178.8)$(126.6)$(142.2)
Funded status recognized in the balance sheet:
Other assets$1.5 $2.1 $— $— 
Other current liabilities(10.7)(8.6)(13.5)(11.9)
Long-term liabilities(160.9)(172.3)(113.1)(130.3)
$(170.1)$(178.8)$(126.6)$(142.2)
Weighted Average Assumptions Used to Determine Benefit Obligation
Weighted average assumptions:
Discount rate5.2 %4.6 %5.3 %4.6 %
Compensation increases2.5 %3.5 %3.5 %3.5 %
Plans with Benefit Obligations in Excess of Plan Assets
Defined benefit pension plans with benefit obligations in excess of plan assets:
Year Ended December 31,
20242023
Benefit obligation$(208.3)$(215.5)
Plan assets36.7 34.7 
 $(171.6)$(180.8)
Estimated Benefits Expected to be Paid
At December 31, 2024, the estimated pension and other postemployment benefits expected to be paid over the next 10 years:
Defined Benefit Pension PlansPostemployment Arrangements
2025$12.3 $13.5 
202611.8 12.2 
202712.6 13.7 
202816.0 13.4 
202922.2 12.7 
2030 - 2034102.0 48.0