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Retirement Benefit Plans - Schedule of Fair Value Hierarchy for Investments of Pension Assets Measured at Fair Value on a Recurring Basis (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | $ 370.9 | $ 396.0
Level 1, 2 and 3 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 50.9 | 98.6
Level 1, 2 and 3 | Fair Value, Recurring | Cash and cash equivalents |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 14.0 | 28.0
Level 1, 2 and 3 | Fair Value, Recurring | Government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 8.0 | 9.0
Level 1, 2 and 3 | Fair Value, Recurring | Equity securities - U.S. companies |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.1 | 0.1
Level 1, 2 and 3 | Fair Value, Recurring | Common collective funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 31.0
Level 1, 2 and 3 | Fair Value, Recurring | Mutual funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 28.8 | 30.5
Level 1 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 50.9 | 98.6
Level 1 | Fair Value, Recurring | Cash and cash equivalents |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 14.0 | 28.0
Level 1 | Fair Value, Recurring | Government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 8.0 | 9.0
Level 1 | Fair Value, Recurring | Equity securities - U.S. companies |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.1 | 0.1
Level 1 | Fair Value, Recurring | Common collective funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 31.0
Level 1 | Fair Value, Recurring | Mutual funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 28.8 | 30.5
Level 2 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 2 | Fair Value, Recurring | Cash and cash equivalents |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 2 | Fair Value, Recurring | Government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 2 | Fair Value, Recurring | Equity securities - U.S. companies |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 2 | Fair Value, Recurring | Common collective funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 2 | Fair Value, Recurring | Mutual funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 3 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 3 | Fair Value, Recurring | Cash and cash equivalents |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 3 | Fair Value, Recurring | Government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 3 | Fair Value, Recurring | Equity securities - U.S. companies |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 3 | Fair Value, Recurring | Common collective funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Level 3 | Fair Value, Recurring | Mutual funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 0.0 | 0.0
Fair Value Measured at Net Asset Value Per Share | Common collective funds - fixed income |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 132.2 | 166.1
Fair Value Measured at Net Asset Value Per Share | Common collective funds - international equities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 47.3 | 45.8
Fair Value Measured at Net Asset Value Per Share | Limited partnerships |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 4.2 | 5.4
Fair Value Measured at Net Asset Value Per Share | Real estate partnerships |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 2.3 | 3.5
Fair Value Measured at Net Asset Value Per Share | Other liability-driven investments |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | 109.1 | 51.6
Fair Value Measured at Net Asset Value Per Share | Other assets |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fair value of plan assets at end of year | $ 24.9 | $ 25.0

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