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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
Mar. 31, 2024
USD ($)
retiree
Mar. 31, 2023
USD ($)
retiree
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     $ 0.4 $ 0.4 $ 1.0 $ 1.0
Interest cost     44.8 56.6 137.7 168.8
Expected return on plan assets     (51.6) (66.5) (159.8) (197.9)
Amortization of prior service benefit     (1.2) (1.2) (3.5) (3.6)
Recognized net actuarial loss     19.8 21.3 63.8 63.5
Settlement losses         132.3 183.2
Net periodic pension expense (income)     12.2 10.6 171.5 215.0
Pension Plans | U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     0.0 0.0 0.0 0.0
Interest cost     27.6 38.2 86.9 114.5
Expected return on plan assets     (29.4) (44.7) (94.0) (134.0)
Amortization of prior service benefit     (0.7) (0.7) (1.9) (1.9)
Recognized net actuarial loss     14.6 18.9 48.2 56.7
Settlement losses         132.3 183.2
Net periodic pension expense (income)     12.1 11.7 171.5 218.5
Group annuity contract to transfer projected benefit obligations, purchase amount $ 195.0 $ 265.0        
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree 3,800 8,650        
Pension Plans | International Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     0.4 0.4 1.0 1.0
Interest cost     17.2 18.4 50.8 54.3
Expected return on plan assets     (22.2) (21.8) (65.8) (63.9)
Amortization of prior service benefit     (0.5) (0.5) (1.6) (1.7)
Recognized net actuarial loss     5.2 2.4 15.6 6.8
Settlement losses         0.0 0.0
Net periodic pension expense (income)     0.1 (1.1) 0.0 (3.5)
Postretirement Benefit Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     0.0 0.0 0.1 0.1
Interest cost     0.6 0.7 1.8 2.2
Expected return on plan assets     0.0 0.0 (0.1) (0.2)
Amortization of prior service benefit     0.1 (0.3) 0.1 (0.9)
Recognized net actuarial loss     (0.8) (0.7) (2.3) (2.1)
Net periodic pension expense (income)     $ (0.1) $ (0.3) $ (0.4) $ (0.9)