Retirement Benefit Plans - Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| United States [Member] | |||
| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | |||
| Projected benefit obligation - beginning of year | $ 356.2 | $ 380.6 | |
| Service cost | 0.2 | 0.3 | $ 0.4 |
| Interest cost | 18.1 | 18.3 | 18.7 |
| Benefits paid | (20.6) | (22.0) | |
| Actuarial loss (gain) | 14.6 | (21.0) | |
| Projected benefit obligation - end of year | 368.5 | 356.2 | 380.6 |
| Foreign [Member] | |||
| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | |||
| Projected benefit obligation - beginning of year | 656.4 | 654.4 | |
| Service cost | 20.9 | 18.1 | 15.5 |
| Interest cost | 12.4 | 14.2 | 15.7 |
| Plan amendments | 7.6 | ||
| Employee contributions | 26.8 | 21.7 | |
| Benefits paid | (77.2) | (67.3) | |
| Actuarial loss (gain) | (8.6) | 53.2 | |
| Settlements | (2.3) | ||
| Translation loss (gain) | 82.1 | (43.2) | |
| Projected benefit obligation - end of year | $ 712.8 | $ 656.4 | $ 654.4 |
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Pension Plans, Postretirement and Other Employee Benefits [Line Items] No definition available.
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