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Retirement Benefit Plans - Accumulated Benefit Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
UNITED STATES    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation $ 0.9 $ 0.9
Non-U.S. Plan | U.K. Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation 6.2 6.5
Non-U.S. Plan | German Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation 1.0 0.7
Non-U.S. Plan | French Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation 0.4 0.5
Non-U.S. Plan | Italian Pension Plan | Pension Plan    
Defined Benefit Plan, Plan Assets, Category [Line Items]    
Accumulated benefit obligation $ 2.5 $ 2.4