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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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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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