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Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Net Period Benefit Costs (Income) for Post-retirement Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Components of net periodic benefit cost:        
Interest cost $ 6.7 $ 7.0 $ 20.3 $ 21.0
Amortization of net prior service credit and net actuarial gain 0.1 0.1 0.2 0.2
Net periodic benefit cost 1.8 2.1 5.2 6.0
Other post-retirement employee benefit plans        
Components of net periodic benefit cost:        
Interest cost 0.4 0.4 1.1 1.2
Amortization of net prior service credit and net actuarial gain 0.0 (0.1) (0.3) (0.3)
Net periodic benefit cost $ 0.4 $ 0.3 $ 0.8 $ 0.9