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Pension and Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Components of net periodic benefit cost        
Service costs $ 1.2 $ 1.0 $ 3.1 $ 3.3
Interest costs 0.9 0.9 2.6 2.6
Expected return on plan assets (2.9) (2.7) (8.5) (8.0)
Recognized net actuarial loss 0.2 0.6 0.5 1.4
Net periodic benefit (income) expense (0.6) (0.2) (2.3) (0.7)
Postretirement Benefits        
Components of net periodic benefit cost        
Service costs 0.0 0.0 0.0 0.0
Interest costs 0.0 0.1 0.1 0.2
Expected return on plan assets 0.0 (0.1) (0.1) (0.2)
Recognized net actuarial loss 0.1 0.1 0.1 0.2
Net periodic benefit (income) expense $ 0.1 $ 0.1 $ 0.1 $ 0.2