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Retirement Benefit Plans - Accumulated Benefit Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
UNITED STATES | Supplemental Employee Retirement Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation $ 0.8 $ 0.9
Non-U.S. Plan | U.K. Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation 6.3 6.2
Non-U.S. Plan | German Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation 0.9 1.0
Non-U.S. Plan | French Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation 0.5 0.4
Non-U.S. Plan | Italian Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation $ 2.4 $ 2.5