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Retirement Benefit Plans - Reconciliation of Level 3 Investments (Details) - U.K. Pension Plan - Non-U.S. Plan - Pension Plan - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value at beginning of year | $ 11.3 | $ 12.9 | $ 13.3
Purchases, sales, issuances and settlements, net | (0.3) | 0.2 |
Net (loss) gain | 0.1 | (0.4) |
Foreign currency | (1.4) | (0.2) |
Fair value at end of year | $ 11.3 | $ 12.9 |

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