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Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Weighted-average Asset Allocations by Asset Category
Weighted-average asset allocations by asset category of the U.K. Pension Plan as of December 31, 2024 were as follows:
Quoted Prices in Active Markets for
Identical Assets		Significant Observable InputsSignificant Unobservable Inputs
Asset categoryFair Value(Level 1)(Level 2)(Level 3)
Investment account held by pension plan(a)
$6.7 $— $— $6.7 
Buy-in Insurance Contract(b)
5.9 — — 5.9 
Total$12.6 $— $— $12.6 

(a)This category is comprised of investments in insurance contracts.
(b)This represents the U.K. Pension Plan partial buy-in assets comprised of investments in insurance contracts.
Weighted-average asset allocations by asset category of the U.K. Pension Plan as of December 31, 2023 were as follows:
Quoted Prices in Active Markets for
Identical Assets		Significant Observable InputsSignificant Unobservable Inputs
Asset categoryFair Value(Level 1)(Level 2)(Level 3)
Investment account held by pension plan(a)
$12.7 — — $12.7 
Total$12.7 $— $— $12.7 
(a)This category is comprised of investments in insurance contracts.
Schedule of Reconciliation of Level 3 Investments
A reconciliation of the beginning and ending balances of the Level 3 investments of our U.K. Pension Plan during the years ended December 31 was as follows:
20242023
Fair value at beginning of year$12.7 $11.3 
Purchases, sales, issuances and settlements, net(0.4)(0.3)
Net (loss) gain(0.2)1.1 
Net transfer in0.7 — 
Foreign currency(0.2)0.6 
Fair value at end of year$12.6 $12.7 
Schedule of Weighted-Average Assumptions
Weighted-average assumptions used to determine benefit obligations as of December 31 were as follows:
U.S. Nonqualified PlanNon-U.S.
Pension Benefits 		Postretirement
Medical Benefits
202420232024202320242023
Discount rate5.42 %5.07 %4.65 %4.26 %5.39 %5.06 %
Rate of compensation increase— %— %3.00 %3.00 %— %— %
Weighted-average assumptions used to determine net periodic benefit costs as of December 31 were as follows:
U.S. Nonqualified PlanNon-U.S.
Pension Benefits		Postretirement
Medical Benefits
202420232022202420232022202420232022
Discount rate5.07 %5.37 %2.54 %4.26 %4.68 %1.55 %5.06 %5.37 %2.53 %
Expected long-term rate of return on plan assets— %— %— %6.10 %6.10 %3.20 %— %— %— %
Rate of compensation increase— %— %— %3.00 %2.25 %1.50 %— %— %— %
Schedule of Accumulated Benefit Obligations
The accumulated benefit obligations as of December 31 for all defined benefit plans were as follows:
20242023
U.S. Nonqualified Plan$0.8 $0.9 
U.K. Pension Plan6.3 6.2 
German Pension Plan0.9 1.0 
French Pension Plan0.5 0.4 
Italian Pension Plan2.4 2.5 
Information For Our Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets
Information for our plans with an accumulated benefit obligation in excess of plan assets as of December 31 was as follows:
20242023
Accumulated benefit obligation$4.6 $4.8 
Information For Our Plans With A Projected Benefit Obligation In Excess Of Plan Assets
Information for our plans with a projected benefit obligation in excess of plan assets as of December 31 was as follows:
20242023
Projected benefit obligation$4.9 $5.0 
Schedule of Assumed Health Care Cost Trend Rates
Assumed healthcare cost trend rates as of December 31 were as follows:
20242023
Healthcare cost trend rate assumption for the next year Pre-657.20 %8.00 %
Healthcare cost trend rate assumption for the next year Post-657.90 %8.80 %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)4.00 %4.00 %
Year that the rate reaches the ultimate trend rate20472047
Schedule of Changes In Benefit Obligations and Plan Assets
Summaries related to changes in benefit obligations and plan assets and to the funded status of our defined benefit and postretirement medical benefit plans were as follows:
U.S. Nonqualified PlanNon-U.S.
Pension Benefits		Postretirement
Medical Benefits
202420232024202320242023
Change in benefit obligation:
Benefit obligation at beginning of year$0.9 $0.9 $10.4 $10.3 $4.6 $5.4 
Service cost— — 0.1 0.1 — — 
Interest cost— — 0.4 0.5 0.2 0.3 
Actuarial loss (gain)— 0.1 (0.2)(0.3)0.1 (0.7)
Foreign exchange— — (0.4)0.5 — — 
Net transfer in— — 0.7 — — — 
Benefits paid(0.1)(0.1)(0.7)(0.7)(0.6)(0.4)
Benefit obligation at end of year$0.8 $0.9 $10.3 $10.4 $4.3 $4.6 
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year$— $— $12.7 $11.3 $— $— 
Actual return on plan assets— — (0.2)1.1 — — 
Employer contributions0.1 0.1 0.3 0.3 0.6 0.4 
Foreign exchange— — (0.2)0.6 — — 
Net transfer in— — 0.7 — — — 
Benefits paid(0.1)(0.1)(0.7)(0.6)(0.6)(0.4)
Fair value of plan assets at end of year— — 12.6 12.7 — — 
Funded status at end of year$(0.8)$(0.9)$2.3 $2.3 $(4.3)$(4.6)
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent other assets$— $— $6.4 $6.5 $— $— 
Current liabilities(0.1)(0.1)(0.3)(0.3)(0.5)(0.6)
Long-term liabilities(0.7)(0.8)(3.8)(3.9)(3.8)(4.0)
Net accrued liability$(0.8)$(0.9)$2.3 $2.3 $(4.3)$(4.6)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost$— $— $(0.1)$(0.1)$— $— 
Net actuarial (loss) gain(0.7)(0.7)2.7 3.6 1.4 1.8 
Accumulated other comprehensive (loss) income$(0.7)$(0.7)$2.6 $3.5 $1.4 $1.8 
Schedule of Net Benefit Costs
The components of the net periodic benefit cost (credit) for the three years ended December 31 were as follows:
U.S. Nonqualified PlanNon-U.S.
Pension Benefits		Postretirement
Medical Benefits
202420232022202420232022202420232022
Service cost$— $— $— $0.1 $0.1 $0.3 $— $— $— 
Interest cost— — — 0.4 0.5 0.2 0.2 0.3 0.2 
Expected return on plan assets— — — (0.8)(0.7)(0.4)— — — 
Amortization of net actuarial loss (gain)0.1 0.1 0.1 (0.1)(0.1)— (0.3)(0.2)— 
Net periodic benefit cost (credit)$0.1 $0.1 $0.1 $(0.4)$(0.2)$0.1 $(0.1)$0.1 $0.2 
Schedule of Changes In Accumulated Other Comprehensive Loss
The changes in accumulated other comprehensive loss for the three years ended December 31 were as follows:
U.S. Nonqualified PlanNon-U.S.
Pension Benefits		Postretirement
Medical Benefits
202420232022202420232022202420232022
Net actuarial loss (gain)0.1 0.1 (0.1)0.8 (0.9)(5.0)0.1 (0.7)(1.1)
Foreign exchange— — — 0.1 — — — — — 
Amortization of net actuarial (loss) gain(0.1)(0.1)(0.1)0.1 0.1 — 0.3 0.2 — 
Total recognized in other comprehensive (income) loss$— $— $(0.2)$1.0 $(0.8)$(5.0)$0.4 $(0.5)$(1.1)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss$0.1 $0.1 $(0.1)$0.6 $(1.0)$(4.9)$0.3 $(0.4)$(0.9)
Schedule Of Benefit Payments For Expected Future Service
The following benefit payments, which reflect expected future service, are expected to be paid:
U.S.
Nonqualified Plan		Non-U.S.
Pension Benefits		Postretirement
Medical Benefits
2025$0.1 $0.7 $0.5 
20260.1 0.7 0.5 
20270.1 0.6 0.5 
20280.1 0.8 0.5 
20290.1 0.7 0.5 
2028 to 20310.3 3.8 1.9 
Total$0.8 $7.3 $4.4