Retirement Benefit Plans - Reconciliation of Beginning and Ending Balances of Foreign Pension Plan Assets Measured at Fair Value (Detail) - Foreign [Member] - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Schedule of Fair Values of Plan Assets [Line Items] | ||
| Plan assets at fair market value - beginning of year | $ 718.4 | $ 751.7 |
| Translation gain | 90.7 | (48.9) |
| Plan assets at fair market value - end of year | 827.1 | 718.4 |
| Fair Value Measurements at Reporting Date Using: Significant Unobservable Inputs (Level 3) [Member] | ||
| Schedule of Fair Values of Plan Assets [Line Items] | ||
| Plan assets at fair market value - beginning of year | 183.0 | |
| Change in fair value of assets | 16.8 | |
| Net purchases and sales | (5.6) | |
| Translation gain | 26.8 | |
| Plan assets at fair market value - end of year | $ 221.0 | $ 183.0 |
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Schedule of Fair Values of Plan Assets [Line Items] No definition available.
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