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Retirement Benefit Plans - Information for Plans with Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 5.0 | $ 4.7
Fair value of plan assets | $ 0.0 | $ 0.0

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