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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Postretirement Medical Benefits      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.1
Interest cost 0.3 0.2 0.1
Expected return on plan assets 0.0 0.0 0.0
Amortization of net actuarial loss (0.2) 0.0 0.0
Net periodic benefit cost (credit) 0.1 0.2 0.2
UNITED STATES      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Service cost 0.0 0.0  
Interest cost 0.0 0.0  
UNITED STATES | Pension Plan      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 0.0 0.0 0.1
Expected return on plan assets 0.0 0.0 0.0
Amortization of net actuarial loss 0.1 0.1 0.0
Net periodic benefit cost (credit) 0.1 0.1 0.1
Non-U.S. Plan | Pension Plan      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Service cost 0.1 0.3 0.0
Interest cost 0.5 0.2 0.2
Expected return on plan assets (0.7) (0.4) (0.4)
Amortization of net actuarial loss (0.1) 0.0 0.1
Net periodic benefit cost (credit) $ (0.2) $ 0.1 $ (0.1)