v3.25.4
Retirement and Postretirement Plans - Change in Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Change in benefit obligation:      
Service cost $ 8.9    
Pension      
Change in benefit obligation:      
Benefit obligation at the beginning of year 537.1 $ 688.6  
Service cost 8.9 9.2 $ 10.4
Interest cost 29.5 31.1 35.8
Actuarial (gains) losses 27.2 (24.6)  
Benefits paid (33.1) (48.2)  
Settlements (38.6) (118.2)  
Foreign currency translation adjustment 3.8 (0.8)  
Benefit obligation at the end of year 534.8 537.1 688.6
Pension | United States of America | Bargaining Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 471.6 490.9  
Service cost 8.9 8.9 9.5
Interest cost 25.8 25.4 25.9
Actuarial (gains) losses 26.8 (16.9)  
Benefits paid (29.2) (36.7)  
Settlements (38.6)    
Benefit obligation at the end of year 465.3 471.6 490.9
Pension | United States of America | Salaried Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 0.0 124.0  
Service cost   0.3 0.9
Interest cost   2.3 6.7
Actuarial (gains) losses   (1.5)  
Benefits paid   (6.9)  
Settlements   (118.2)  
Benefit obligation at the end of year   0.0 124.0
Pension | United States of America | Supplemental Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 16.1 $ 16.5  
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 0.9
Actuarial (gains) losses 0.0 (0.7)  
Benefits paid (0.6) (0.6)  
Settlements 0.0    
Benefit obligation at the end of year 16.4 16.1 16.5
Pension | Foreign Pension Plan      
Change in benefit obligation:      
Benefit obligation at the beginning of year 49.4 57.2  
Interest cost 2.8 2.5 2.3
Actuarial (gains) losses 0.4 (5.5)  
Benefits paid (3.3) (4.0)  
Foreign currency translation adjustment 3.8 (0.8)  
Benefit obligation at the end of year 53.1 49.4 57.2
Postretirement      
Change in benefit obligation:      
Benefit obligation at the beginning of year 80.1 84.9  
Service cost 0.5 0.6 0.7
Interest cost 4.3 4.3 4.7
Actuarial (gains) losses 0.6 (0.2)  
Benefits paid (9.9) (9.5)  
Benefit obligation at the end of year $ 75.6 $ 80.1 $ 84.9