v3.26.1
Retirement and Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Net remeasurement losses (gains)   $ 2.5      
Pension          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost $ 2.0   $ 2.2 $ 4.2 $ 4.4
Interest cost 7.1   7.4 14.2 14.8
Expected return on plan assets (7.8)   (8.1) (16.2) (16.2)
Amortization of prior service cost 0.4   0.3 0.7 0.6
Net remeasurement losses (gains)       (2.5)  
Net Periodic Benefit Cost (Income) 1.7   1.8 0.4 3.6
Pension | United States of America | Bargaining Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost 2.0   2.2 4.2 4.4
Interest cost 6.1   6.5 12.3 13.0
Expected return on plan assets (7.2)   (7.5) (15.1) (15.0)
Amortization of prior service cost 0.4   0.3 0.7 0.6
Net remeasurement losses (gains)       (2.5)  
Net Periodic Benefit Cost (Income) 1.3   1.5 (0.4) 3.0
Pension | United States of America | Supplemental Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Interest cost 0.3   0.2 0.5 0.4
Net Periodic Benefit Cost (Income) 0.3   0.2 0.5 0.4
Pension | Foreign Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Interest cost 0.7   0.7 1.4 1.4
Expected return on plan assets (0.6)   (0.6) (1.1) (1.2)
Net Periodic Benefit Cost (Income) 0.1   0.1 0.3 0.2
Postretirement          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost 0.1   0.1 0.2 0.2
Interest cost 1.0   1.1 2.0 2.2
Expected return on plan assets (0.6)   (0.7) (1.3) (1.4)
Amortization of prior service cost (1.5)   (1.5) (3.0) (3.0)
Net Periodic Benefit Cost (Income) $ (1.0)   $ (1.0) $ (2.1) $ (2.0)