v3.25.4
Retirement and Postretirement Plans - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 05, 2026
Jan. 31, 2026
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Defined contribution plan cost           $ 3.6 $ 3.1 $ 3.4
Loss (gain) from remeasurement of benefit plans       $ 1.0   6.6 10.3 40.6
Investment losses on plan assets       1.8   $ 21.2 35.0 4.0
Offset amount in the decrease of liability       0.7        
Gain on plan asset annuitization       $ 0.1        
Salaried Plan                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Defined benefit plan of recognized loss     $ (3.6)          
Benefit plan terminated effective date           Mar. 31, 2022    
Loss (gain) from remeasurement of benefit plans         $ 0.8      
Bargaining Plan                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Bargaining Plan's obligations           $ 27.0    
Company contributions to plans           62.0    
Accumulated benefit obligation for plans which the accumulated benefit obligation exceeded the fair value of plan assets           457.6    
Bargaining Plan | Subsequent Event                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Defined benefit plan term of contract 4 years              
Company contributions to plans   $ 4.8            
Pension                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Settlement gain           (8.2) (10.4) (38.7)
Retirement plan expenses           2.5 3.3  
Accumulated benefit obligation           526.9 532.5  
Pension | Salaried Plan | United States of America                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Settlement gain             $ (1.8) $ (4.0)
Supplemental Plan                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Accumulated benefit obligation for plans which the accumulated benefit obligation exceeded the fair value of plan assets           16.4    
Pension and Postretirement Plans                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Expected contributions and payments in next 12 months           32.1    
Expected contributions and payments from 2027 through 2035           $ 94.0