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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Income) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
retiree
Mar. 31, 2024
USD ($)
retiree
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     $ 0.4 $ 0.4 $ 1.1 $ 1.0
Interest cost     47.8 44.8 140.2 137.7
Expected return on plan assets     (57.2) (51.6) (152.8) (159.8)
Amortization of prior service benefit     (1.1) (1.2) (3.4) (3.5)
Recognized net actuarial loss (gain)     25.1 19.8 73.6 63.8
Settlement losses     227.7 0.0 227.7 132.3
Net periodic pension and postretirement expense (income)     242.7 12.2 286.4 171.5
Pension Plans | U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     0.0 0.0 0.0 0.0
Interest cost     28.6 27.6 84.4 86.9
Expected return on plan assets     (34.6) (29.4) (87.2) (94.0)
Amortization of prior service benefit     (0.6) (0.7) (1.9) (1.9)
Recognized net actuarial loss (gain)     18.7 14.6 54.8 48.2
Settlement losses     227.7 0.0 227.7 132.3
Net periodic pension and postretirement expense (income)     239.8 12.1 277.8 171.5
Group annuity contract to transfer projected benefit obligations, purchase amount $ 316.0 $ 195.0        
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree 3,150 3,800        
Pension Plans | International Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     0.4 0.4 1.1 1.0
Interest cost     19.2 17.2 55.8 50.8
Expected return on plan assets     (22.6) (22.2) (65.6) (65.8)
Amortization of prior service benefit     (0.5) (0.5) (1.5) (1.6)
Recognized net actuarial loss (gain)     6.4 5.2 18.8 15.6
Settlement losses     0.0 0.0 0.0 0.0
Net periodic pension and postretirement expense (income)     2.9 0.1 8.6 0.0
Postretirement Benefit Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     0.0 0.0 0.1 0.1
Interest cost     0.6 0.6 1.8 1.8
Expected return on plan assets     0.0 0.0 (0.1) (0.1)
Amortization of prior service benefit     0.1 0.1 0.2 0.1
Recognized net actuarial loss (gain)     (0.5) (0.8) (1.6) (2.3)
Net periodic pension and postretirement expense (income)     $ 0.2 $ (0.1) $ 0.4 $ (0.4)