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Retirement and Postretirement Plans - Change in Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Salaried Plan      
Change in benefit obligation:      
Actuarial (gains) losses $ 1.0    
Pension      
Change in benefit obligation:      
Benefit obligation at the beginning of year 688.6 $ 666.6  
Service cost 9.2 10.4 $ 14.2
Interest cost 31.1 35.8 39.6
Actuarial (gains) losses (24.6) 32.8  
Benefits paid (48.2) (53.8)  
Settlements (118.2) (6.0)  
Foreign currency translation adjustment (0.8) 2.8  
Benefit obligation at the end of year 537.1 688.6 666.6
Pension | United States of America | Bargaining Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 490.9 474.9  
Service cost 8.9 9.5 13.9
Interest cost 25.4 25.9 31.1
Actuarial (gains) losses (16.9) 19.1  
Benefits paid (36.7) (38.5)  
Settlements 0.0    
Benefit obligation at the end of year 471.6 490.9 474.9
Pension | United States of America | Salaried Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 124.0 128.1  
Service cost 0.3 0.9 0.3
Interest cost 2.3 6.7 6.5
Actuarial (gains) losses (1.5) 5.7  
Benefits paid (6.9) (11.4)  
Settlements (118.2) (6.0)  
Benefit obligation at the end of year 0.0 124.0 128.1
Pension | United States of America | Supplemental Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 16.5 $ 15.5  
Service cost $ 0.0    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Liability, Defined Benefit Plan, Noncurrent Liability, Defined Benefit Plan, Noncurrent  
Interest cost $ 0.9 $ 0.9 0.7
Actuarial (gains) losses (0.7) 0.7  
Benefits paid (0.6) (0.6)  
Settlements 0.0    
Benefit obligation at the end of year 16.1 16.5 15.5
Pension | United Kingdom | Pension Scheme      
Change in benefit obligation:      
Benefit obligation at the beginning of year 56.7 47.7  
Service cost 0.0    
Interest cost 2.5 2.3 1.3
Actuarial (gains) losses (5.1) 7.3  
Benefits paid (4.0) (3.3)  
Foreign currency translation adjustment (0.8) 2.7  
Benefit obligation at the end of year 49.3 56.7 47.7
Pension | Mexico | Pension Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 0.5 0.4  
Actuarial (gains) losses (0.4)    
Foreign currency translation adjustment 0.0 0.1  
Benefit obligation at the end of year 0.1 0.5 0.4
Postretirement      
Change in benefit obligation:      
Benefit obligation at the beginning of year 84.9 87.4  
Service cost 0.6 0.7 1.1
Interest cost 4.3 4.7 3.4
Actuarial (gains) losses (0.2) 3.8  
Benefits paid (9.5) (11.7)  
Benefit obligation at the end of year $ 80.1 $ 84.9 $ 87.4