Retirement Benefit Plans - Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
United States [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	$ 380.6	$ 366.8
Service cost	0.3	0.4	$ 0.7
Interest cost	18.3	18.7	11.7
Benefits paid	(22.0)	(20.1)
Actuarial loss (gain)	(21.0)	15.1
Settlements	0.0	(0.3)
Projected benefit obligation - end of year	356.2	380.6	366.8
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	654.4	567.9
Service cost	18.1	15.5	22.7
Interest cost	14.2	15.7	5.4
Plan amendments	7.6
Employee contributions	21.7	24.1
Benefits paid	(67.3)	(48.1)
Actuarial loss (gain)	53.2	31.1
Settlements	(2.3)
Translation loss (gain)	(43.2)	48.2
Projected benefit obligation - end of year	$ 656.4	$ 654.4	$ 567.9