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Retirement Benefit Plans - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Postretirement Medical Benefits      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Net actuarial loss (gain) $ 0.1 $ (0.7) $ (1.1)
Foreign exchange 0.0 0.0 0.0
Amortization of net actuarial (loss) gain 0.3 0.2 0.0
Total recognized in other comprehensive (income) loss 0.4 (0.5) (1.1)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss 0.3 (0.4) (0.9)
UNITED STATES | Supplemental Employee Retirement Plan      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Net actuarial loss (gain) 0.1 0.1 (0.1)
Foreign exchange 0.0 0.0 0.0
Amortization of net actuarial (loss) gain (0.1) (0.1) (0.1)
Total recognized in other comprehensive (income) loss 0.0 0.0 (0.2)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss 0.1 0.1 (0.1)
Non-U.S. Plan | Pension Plan      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Net actuarial loss (gain) 0.8 (0.9) (5.0)
Foreign exchange 0.1 0.0 0.0
Amortization of net actuarial (loss) gain 0.1 0.1 0.0
Total recognized in other comprehensive (income) loss 1.0 (0.8) (5.0)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss $ 0.6 $ (1.0) $ (4.9)