Retirement Benefit Plans - Plans with Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| United States [Member] | ||
| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | ||
| Projected benefit obligation | $ 1.2 | $ 1.2 |
| Foreign [Member] | ||
| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | ||
| Projected benefit obligation | 28.1 | 26.9 |
| Plan assets at fair market value | $ 9.3 | $ 8.0 |