Retirement Benefit Plans - Total Accumulated Benefit Obligations and Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
United States [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	$ 356.2	$ 380.6
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	1.2	1.3
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	641.0	640.3
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	24.8	24.9
Plan assets at fair market value	$ 8.0	$ 8.6