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Pension and Other Postretirement Benefits - Change in benefit obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year $ 305.1 $ 263.0  
Service cost 4.0 3.3 $ 4.3
Interest cost 17.2 17.3 10.3
Plan amendments 0.0 1.1  
Actuarial (gain) loss (3.2) 11.0  
Medicare Part D 0.0 0.0  
Acquisition 0.0 28.6  
Benefits paid (21.4) (19.9)  
Exchange rates (0.4) (0.5)  
Plan participants' contributions 1.0 1.2  
Benefit obligation at end of year 302.3 305.1 263.0
OPEB      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 76.8 73.7  
Service cost 0.2 0.1 0.2
Interest cost 3.9 3.9 2.9
Plan amendments 0.0 0.0  
Actuarial (gain) loss 0.3 4.8  
Medicare Part D 0.2 0.3  
Acquisition 0.0 0.8  
Benefits paid (5.7) (6.8)  
Exchange rates 0.0 0.0  
Plan participants' contributions 0.0 0.0  
Benefit obligation at end of year $ 75.7 $ 76.8 $ 73.7