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Retirement Benefit Plans - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Postretirement Medical Benefits |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Prior service cost | $ 0.0 | $ 0.0 | $ 0.0
Net actuarial (gain) loss | (0.7) | (1.1) | 0.6
Amortization of net actuarial (loss) gain | 0.2 | 0.0 | 0.0
Total recognized in other comprehensive (income) loss | (0.5) | (1.1) | 0.6
Total recognized in net benefit (credit) cost and other comprehensive (income) loss | (0.4) | (0.9) | 0.8
UNITED STATES | Pension Plan |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Net actuarial (gain) loss | 0.1 | (0.1) | 0.0
Amortization of net actuarial (loss) gain | (0.1) | (0.1) | 0.0
Total recognized in other comprehensive (income) loss | 0.0 | (0.2) | 0.0
Total recognized in net benefit (credit) cost and other comprehensive (income) loss | 0.1 | (0.1) | 0.1
Non-U.S. Plan | Pension Plan |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Net actuarial (gain) loss | (0.9) | (5.0) | 0.2
Amortization of net actuarial (loss) gain | 0.1 | 0.0 | (0.1)
Total recognized in other comprehensive (income) loss | (0.8) | (5.0) | 0.1
Total recognized in net benefit (credit) cost and other comprehensive (income) loss | $ (1.0) | $ (4.9) | $ 0.0

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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income and net benefit cost (credit) for defined benefit plan. + References No definition available. + Details
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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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