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Pension and Other Post-retirement Benefits - Components of Company's Net Periodic Pension Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Net periodic cost (benefit)      
Service cost $ 1.1 $ 0.9 $ 1.4
Interest cost 1.4 1.2 14.5
Expected return on plan assets (1.2) (1.0) (21.5)
Net actuarial loss 0.3 0.1 19.9
Prior service cost 0.1 0.1 (0.4)
Defined-benefit plan expense (income) 1.7 1.3 13.9
Pension settlement (income) expense 0.0 (0.9) 417.3
Various U.S. defined contribution plans cost 17.9 16.5 15.3
Total defined benefit plan and defined contribution plan periodic benefit cost 19.6 16.9 446.5
Other changes in plan assets and projected benefit obligation recognized in other comprehensive loss      
Net actuarial loss (gain) 1.9 1.5 (27.0)
Amortization of net actuarial loss (0.3) (0.1) (19.9)
Settlement loss 0.0 0.0 (417.3)
Amortization of prior service cost (0.1) (0.1) 0.4
Total recognized in other comprehensive loss 1.5 1.3 (463.8)
Total recognized in net periodic cost (benefit) and other comprehensive loss 3.2 1.7 (32.6)
Post-retirement Benefits      
Net periodic cost (benefit)      
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.1 0.1
Expected return on plan assets 0.0 0.0 0.0
Net actuarial loss 0.0 0.0 0.0
Prior service cost (0.5) (0.5) (0.5)
Defined-benefit plan expense (income) (0.4) (0.4) (0.4)
Pension settlement (income) expense 0.0 0.0 0.0
Total defined benefit plan and defined contribution plan periodic benefit cost (0.4) (0.4) (0.4)
Other changes in plan assets and projected benefit obligation recognized in other comprehensive loss      
Net actuarial loss (gain) (0.1) 0.0 0.2
Amortization of net actuarial loss 0.0 0.0 0.0
Settlement loss 0.0 0.0 0.0
Amortization of prior service cost 0.5 0.5 0.5
Total recognized in other comprehensive loss 0.4 0.5 0.7
Total recognized in net periodic cost (benefit) and other comprehensive loss $ 0.0 $ 0.1 $ 0.3