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Other Postretirement Benefit Plans - Schedule of Change in Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in benefit obligation:          
Actuarial (gains) losses $ (1.3) $ 22.3      
Postretirement Plan          
Change in benefit obligation:          
Benefit obligation at beginning of year     $ 33.7 $ 35.5  
Service cost     0.1 0.1 $ 0.2
Interest cost     1.7 1.9 1.4
Actuarial (gains) losses     (0.5) (1.0)  
International plan exchange rate change     0.0 (0.1)  
Benefits paid     (1.6) (2.7)  
Benefit obligation at end of year 33.4 33.7 33.4 33.7 $ 35.5
Funded status at end of year $ (33.4) $ (33.7) $ (33.4) $ (33.7)