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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Income) (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Mar. 31, 2024
USD ($)
retiree
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost   $ 0.4 $ 0.3
Interest cost   45.6 47.9
Expected return on plan assets   (47.1) (56.2)
Amortization of prior service benefit   (1.1) (1.2)
Recognized net actuarial loss (gain)   24.0 23.6
Settlement losses   0.0 132.3
Net periodic postretirement benefit expense (income)   21.8 146.7
Pension Plans | U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost   0.0 0.0
Interest cost   27.9 31.0
Expected return on plan assets   (26.3) (34.4)
Amortization of prior service benefit   (0.6) (0.6)
Recognized net actuarial loss (gain)   18.0 18.4
Settlement losses   0.0 132.3
Net periodic postretirement benefit expense (income)   19.0 146.7
Group annuity contract to transfer projected benefit obligations, purchase amount $ 195.0    
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree 3,800    
Pension Plans | International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost   0.4 0.3
Interest cost   17.7 16.9
Expected return on plan assets   (20.8) (21.8)
Amortization of prior service benefit   (0.5) (0.6)
Recognized net actuarial loss (gain)   6.0 5.2
Settlement losses   0.0 0.0
Net periodic postretirement benefit expense (income)   2.8 0.0
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost   0.0 0.1
Interest cost   0.6 0.6
Expected return on plan assets   (0.1) 0.0
Amortization of prior service benefit   0.1 0.0
Recognized net actuarial loss (gain)   (0.5) (0.8)
Net periodic postretirement benefit expense (income)   $ 0.1 $ (0.1)