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Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Schedule of Net Period Benefit Costs (Income) for Post-retirement Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Components of net periodic benefit cost:    
Interest cost $ 6.3 $ 6.7
Amortization of net prior service credit and net actuarial gain 0.1 0.1
Net periodic benefit cost 1.0 1.6
Other post-retirement employee benefit plans    
Components of net periodic benefit cost:    
Interest cost 0.3 0.4
Amortization of net prior service credit and net actuarial gain (0.2) (0.1)
Net periodic benefit cost $ 0.1 $ 0.3