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Retirement Benefit Plans - Accumulated Benefit Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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UNITED STATES | U.S. Nonqualified Plan |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Accumulated benefit obligation | $ 0.9 | $ 1.1
Non-U.S. Plan | U.K. Pension Plan | Pension Plan |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Accumulated benefit obligation | 6.5 | 11.4
Non-U.S. Plan | German Pension Plan | Pension Plan |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Accumulated benefit obligation | 0.7 | 1.0
Non-U.S. Plan | French Pension Plan | Pension Plan |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Accumulated benefit obligation | 0.5 | 0.0
Non-U.S. Plan | Italian Pension Plan | Pension Plan |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Accumulated benefit obligation | $ 2.4 | $ 3.7

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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