Retirement Benefit Plan - Summary of Amounts Recognized in Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
United States [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prepaid pension	$ 89.0	$ 54.5
Short-term accrued benefit liability	(0.1)	(0.1)
Long-term accrued benefit liability	(1.1)	(1.2)
Net amount recognized	87.8	53.2
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prepaid pension	82.5	117.8
Short-term accrued benefit liability	(1.3)	(1.4)
Long-term accrued benefit liability	(19.2)	(19.1)
Net amount recognized	$ 62.0	$ 97.3