Retirement Benefit Plan - Changes in Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
United States [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	$ 433.8	$ 396.2
Actual return on plan assets	32.0	57.6
Employer contributions	0.1	0.4
Settlements	0.0	(0.3)
Benefits paid	(22.0)	(20.1)
Plan assets at fair market value - end of year	444.0	433.8
Funded status	87.8	53.2
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	751.7	667.2
Actual return on plan assets	46.0	31.9
Employer contributions	17.5	19.9
Employee contributions	21.7	24.1
Settlements	(2.3)
Benefits paid	(67.3)	(48.1)
Translation gain (loss)	(48.9)	56.7
Plan assets at fair market value - end of year	718.4	751.7
Funded status	$ 62.0	$ 97.3