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Retirement Benefit Plans - Narrative (Details) € in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2025 EUR (€) | Dec. 31, 2024 USD ($) plan | Dec. 31, 2023 USD ($) | Dec. 31, 2025 | Dec. 31, 2024 USD ($) plan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Cash contributions and payments |  |  |  |  | $ 24.6 | $ 27.1 | $ 11.2 |
Actuarial gains (losses) |  | $ 1.3 | $ (22.3) |  |  |  |  |
Percentage of employees covered by four largest plans |  | 83.00% | 83.00% |  | 83.00% | 83.00% |  |
Number of plans frozen | plan |  | 3 |  |  | 3 |  |  |
Return on plan assets |  |  |  |  | $ 32.1 | $ 35.6 | 29.4 |
International Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  | (0.6) | (12.4) | 6.6 |
U.S. Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  | 1.3 | (9.2) | (22.6) |
Pension Plan |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Cash contributions and payments |  |  |  |  | 24.6 | 27.1 |  |
Actuarial gains (losses) |  |  |  |  | 0.7 | (21.6) | $ (16.0) |
Current liabilities |  | $ 7.0 | $ 7.2 |  | 7.0 | 7.2 |  |
Pension plan with project benefit obligation in excess of plan assets, projected benefit obligation |  | 534.9 |  |  | 534.9 |  |  |
Pension plan with project benefit obligation in excess of plan assets, accumulated benefit obligations |  | 527.6 |  |  | 527.6 |  |  |
Pension plan with project benefit obligation in excess of plan assets, fair value of plan assets |  | 370.3 |  |  | 370.3 |  |  |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, projected benefit obligation |  | 526.3 |  |  | 526.3 |  |  |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligations |  | 521.4 |  |  | 521.4 |  |  |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, fair value of plan assets |  | 361.9 |  |  | 361.9 |  |  |
Pension accumulated benefit obligation |  | 528.0 | 567.0 |  | $ 528.0 | 567.0 |  |
Percentage decrease in value (as a percent) |  |  |  |  | 1.40% |  |  |
Defined benefit plan, plan assets, amount |  | $ 370.9 | $ 396.0 |  | $ 370.9 | 396.0 |  |
Pension Plan | International Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Cash contributions and payments |  |  |  |  | 4.1 | 8.0 |  |
Actuarial gains (losses) |  |  |  |  | $ 14.9 | $ (10.8) |  |
Benefit obligation, discount rate (as a percent) |  | 5.43% | 4.48% |  | 5.43% | 4.48% | 4.81% | 1.80%
Current liabilities |  | $ 2.1 | $ 2.4 |  | $ 2.1 | $ 2.4 |  |
Defined benefit plan, plan assets, amount |  | 175.9 | 196.8 |  | 175.9 | 196.8 | $ 185.5 |
Pension Plan | International Plans | Subsequent Event |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Employer contribution toward insurance buy-in contract | € | € 6 |  |  |  |  |  |  |
Pension Plan | International Plans | Fair Value, Recurring |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan, plan assets, amount |  | $ 173.5 | $ 164.0 |  | 173.5 | 164.0 |  |
Pension Plan | U.S. Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Cash contributions and payments |  |  |  |  | 20.5 | 19.1 |  |
Actuarial gains (losses) |  |  |  |  | $ 12.6 | $ (10.8) |  |
Benefit obligation, discount rate (as a percent) |  | 5.83% | 5.40% |  | 5.83% | 5.40% | 5.64% | 3.07%
Benefit cost, discount rate (as a percent) |  |  |  |  | 5.40% |  |  |
Expected long-term return on plan assets (as a percent) |  |  |  |  | 3.94% |  |  |
Current liabilities |  | $ 4.9 | $ 4.8 |  | $ 4.9 | $ 4.8 |  |
Defined benefit plan, plan assets, amount |  | $ 195.0 | $ 199.2 |  | 195.0 | 199.2 | $ 201.6 |
Pension Plan | U.S. Plans | Forecast |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Benefit cost, discount rate (as a percent) |  |  |  | 5.83% |  |  |  |
Expected long-term return on plan assets (as a percent) |  |  |  | 4.30% |  |  |  |
Pension Plan | Discount Rate Increase |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  | 28.7 | 17.6 | 243.2 |
Pension Plan | Return on Plan Assets vs. Expectation |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  | 26.8 |  | 220.6 |
Pension Plan | Experience Losses Impact |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  | $ 1.2 | $ 10.3 | $ 33.0 |
Pension Plan | Discount Rate in Basis Points | International Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) to discount rate (basis points) |  |  |  |  | 0.0095 | 0.0033 | 0.0301 |
Pension Plan | Discount Rate in Basis Points | U.S. Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) to discount rate (basis points) |  |  |  |  | 0.0043 | 0.0024 | 0.0257 |
Pension Plan | Changes in Mortality |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  |  | $ 6.0 |  |
Pension Plan | Other Actuarial Assumptions |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  |  | $ 0.3 | $ 0.2 |
Pension Plan | Inflation Impact |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Recognition of net actuarial gains |  |  |  |  |  |  | $ 5.4 |

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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