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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Components of net periodic benefit cost:        
Interest cost $ 6.3 $ 6.7 $ 18.9 $ 20.3
Amortization of net prior service credit and net actuarial gain 0.1 0.1 0.2 0.2
Net periodic benefit cost 1.1 1.8 2.8 5.2
Other post-retirement employee benefit plans        
Components of net periodic benefit cost:        
Interest cost 0.3 0.4 1.0 1.1
Amortization of net prior service credit and net actuarial gain (0.1) 0.0 (0.4) (0.3)
Net periodic benefit cost $ 0.2 $ 0.4 $ 0.6 $ 0.8