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Pension and Postretirement Benefits - Components of Net Periodic Benefit (Income) Expense (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2023
USD ($)
retiree
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   $ 0.4 $ 0.4 $ 1.0 $ 1.4
Interest cost   56.6 38.2 168.8 116.2
Expected return on plan assets   (66.5) (66.1) (197.9) (201.8)
Amortization of prior service benefit   (1.2) (1.2) (3.6) (3.8)
Recognized net actuarial (loss) gain   21.3 40.5 63.5 123.3
Settlement losses       183.2 0.0
Net periodic pension expense (income)   10.6 11.8 215.0 35.3
Pension Plans | U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   0.0 0.0 0.0 0.0
Interest cost   38.2 28.7 114.5 86.0
Expected return on plan assets   (44.7) (47.4) (134.0) (142.3)
Amortization of prior service benefit   (0.7) (0.6) (1.9) (1.9)
Recognized net actuarial (loss) gain   18.9 31.4 56.7 94.4
Settlement losses       183.2 0.0
Net periodic pension expense (income)   11.7 12.1 218.5 36.2
Group annuity contract to transfer projected benefit obligations, purchase amount $ 265.0        
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree 8,650        
Pension Plans | International Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   0.4 0.4 1.0 1.4
Interest cost   18.4 9.5 54.3 30.2
Expected return on plan assets   (21.8) (18.7) (63.9) (59.5)
Amortization of prior service benefit   (0.5) (0.6) (1.7) (1.9)
Recognized net actuarial (loss) gain   2.4 9.1 6.8 28.9
Settlement losses       0.0 0.0
Net periodic pension expense (income)   (1.1) (0.3) (3.5) (0.9)
Postretirement Benefit Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   0.0 0.1 0.1 0.2
Interest cost   0.7 0.4 2.2 1.4
Expected return on plan assets   0.0 0.0 (0.2) (0.2)
Amortization of prior service benefit   (0.3) (0.4) (0.9) (1.1)
Recognized net actuarial (loss) gain   (0.7) (0.5) (2.1) (1.5)
Net periodic pension expense (income)   $ (0.3) $ (0.4) $ (0.9) $ (1.2)