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Retirement Benefit Plans - Accumulated Benefit Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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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

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