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Pension and Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Domestic Plan        
Components of the net periodic cost for retirement and postretirement benefits        
Service cost $ 6.3 $ 5.7 $ 12.0 $ 10.7
Interest cost 5.0 5.0 10.4 10.2
Expected return on plan assets (5.6) (5.7) (11.6) (12.0)
Amortization of unrecognized prior service cost and other costs 0.0 0.1 0.0 0.1
Amortization of unrecognized net loss 0.0 0.0 0.0 0.0
Net periodic cost recognized 5.7 5.1 10.8 9.0
Foreign Plan        
Components of the net periodic cost for retirement and postretirement benefits        
Service cost 1.3 1.2 2.6 2.3
Interest cost 3.0 3.1 6.0 6.0
Expected return on plan assets (2.0) (1.8) (3.9) (3.4)
Amortization of unrecognized prior service cost and other costs 0.1 0.1 0.2 0.2
Amortization of unrecognized net loss 0.7 0.3 1.3 0.6
Net periodic cost recognized 3.1 2.9 6.2 5.7
Postretirement Medical Benefits        
Components of the net periodic cost for retirement and postretirement benefits        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.1 0.2 0.3 0.4
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of unrecognized prior service cost and other costs 0.1 0.1 0.1 0.1
Amortization of unrecognized net loss 0.0 0.0 0.0 0.0
Net periodic cost recognized $ 0.2 $ 0.3 $ 0.4 $ 0.5