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Retirement Benefit Plans - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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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)

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