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Retirement Benefits - Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Benefits | U.S.        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0.0 $ 0.0 $ 0.0 $ 0.0
Interest cost 0.1 0.1 0.2 0.2
Expected return on plan assets 0.0 0.0 0.0 (0.1)
Net amortization 0.1 0.1 0.1 0.2
Net periodic cost 0.2 0.2 0.3 0.3
Pension Benefits | Non-U.S.        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.5 0.4 0.8 0.8
Interest cost 0.6 0.7 1.2 1.3
Expected return on plan assets (0.4) (0.5) (0.9) (0.9)
Net amortization (0.2) (0.1) (0.2) (0.1)
Net periodic cost 0.5 0.5 0.9 1.1
Other Postretirement Benefits        
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 0.2 0.2 0.4 0.4
Net amortization (0.2) (0.3) (0.4) (0.5)
Net periodic cost $ 0.1 $ 0.0 $ 0.2 $ 0.1