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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of year	$ 12.7	$ 11.3	$ 12.9
Purchases, sales, issuances and settlements, net	(0.3)	(0.3)
Net (loss) gain	1.1	0.1
Foreign currency	0.6	(1.4)
Fair value at end of year	$ 12.7	$ 11.3

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- Definition

Amount of increase (decrease) in asset measured at fair value on recurring basis using unobservable input (level 3) due to foreign currency effects.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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