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Retirement Benefit Plans (Tables) | 12 Months Ended
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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 Inputs |  | Significant Unobservable Inputs
Asset category | Fair 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 Inputs |  | Significant Unobservable Inputs
Asset category | Fair 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:
| 2024 |  | 2023
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 in | 0.7 |  |  | — |
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 Plan |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Discount rate | 5.42 | % |  | 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 Plan |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Discount rate | 5.07 | % |  | 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:
| 2024 |  | 2023
U.S. Nonqualified Plan | $ | 0.8 |  |  | $ | 0.9 |
U.K. Pension Plan | 6.3 |  |  | 6.2 |
German Pension Plan | 0.9 |  |  | 1.0 |
French Pension Plan | 0.5 |  |  | 0.4 |
Italian Pension Plan | 2.4 |  |  | 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:
| 2024 |  | 2023
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:
| 2024 |  | 2023
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:
| 2024 |  | 2023
Healthcare cost trend rate assumption for the next year Pre-65 | 7.20 | % |  | 8.00 | %
Healthcare cost trend rate assumption for the next year Post-65 | 7.90 | % |  | 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 rate | 2047 |  | 2047
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 Plan |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
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 contributions | 0.1 |  |  | 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 Plan |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
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 Plan |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
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 |
2026 | 0.1 |  |  | 0.7 |  |  | 0.5 |
2027 | 0.1 |  |  | 0.6 |  |  | 0.5 |
2028 | 0.1 |  |  | 0.8 |  |  | 0.5 |
2029 | 0.1 |  |  | 0.7 |  |  | 0.5 |
2028 to 2031 | 0.3 |  |  | 3.8 |  |  | 1.9 |
Total | $ | 0.8 |  |  | $ | 7.3 |  |  | $ | 4.4 |

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