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Retirement and Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 2.2 $ 2.4
Interest cost 7.4 8.7
Expected return on plan assets (8.1) (9.3)
Amortization of prior service cost 0.3 0.3
Net remeasurement losses (gains)   0.8
Net Periodic Benefit Cost (Income) 1.8 2.9
Pension | United States of America | Bargaining Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 2.2 2.2
Interest cost 6.5 6.4
Expected return on plan assets (7.5) (7.0)
Amortization of prior service cost 0.3 0.3
Net Periodic Benefit Cost (Income) 1.5 1.9
Pension | United States of America | Salaried Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost   0.2
Interest cost   1.5
Expected return on plan assets   (1.6)
Net remeasurement losses (gains)   0.8
Net Periodic Benefit Cost (Income)   0.9
Pension | United States of America | Supplemental Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost 0.2 0.2
Net Periodic Benefit Cost (Income) 0.2 0.2
Pension | United Kingdom | Pension Scheme    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost 0.7 0.6
Expected return on plan assets (0.6) (0.7)
Net Periodic Benefit Cost (Income) 0.1 (0.1)
Postretirement    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 0.1 0.1
Interest cost 1.1 1.1
Expected return on plan assets (0.7) (0.7)
Amortization of prior service cost (1.5) (1.5)
Net Periodic Benefit Cost (Income) $ (1.0) $ (1.0)