Retirement Benefit Plan - Changes in Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	$ 388.5	$ 433.6
Actual return on plan assets	73.5	(25.7)
Employer contributions	2.0	6.4
Settlements	(2.2)	(5.5)
Benefits paid	(16.9)	(20.3)
Plan assets at fair market value - end of year	444.9	388.5
Funded status	(27.1)	(7.5)
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	585.8	574.9
Actual return on plan assets	57.8	7.5
Employer contributions	20.1	31.7
Employee contributions	20.6	18.1
Benefits paid	(36.5)	(36.9)
Expenses paid	(0.3)	(0.3)
Translation gain (loss)	17.7	(9.2)
Plan assets at fair market value - end of year	665.2	585.8
Funded status	$ (75.2)	$ (45.3)