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Retirement Benefit Plans - Plans with 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]    
Projected benefit obligation $ 1.2 $ 1.3
Foreign [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Projected benefit obligation 26.9 27.2
Plan assets at fair market value $ 8.0 $ 8.6