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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
Mar. 31, 2024
Mar. 31, 2023
Components of net periodic benefit cost:    
Interest cost $ 6.7 $ 7.0
Amortization of net prior service credit and net actuarial gain 0.1 0.1
Net periodic benefit cost 1.6 2.0
Other post-retirement employee benefit plans    
Components of net periodic benefit cost:    
Interest cost 0.4 0.4
Amortization of net prior service credit and net actuarial gain (0.1) (0.1)
Net periodic benefit cost $ 0.3 $ 0.3