Retirement Benefit Plans - Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	$ 396.0	$ 420.7
Service cost	7.1	8.0	$ 8.7
Interest cost	16.2	14.2	14.0
Plan amendments	3.6
Benefits paid	(16.9)	(20.3)
Actuarial loss (gain)	68.2	(21.1)
Settlement	(2.2)	(5.5)
Projected benefit obligation - end of year	472.0	396.0	420.7
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	631.1	623.6
Service cost	19.0	20.0	17.7
Interest cost	9.0	8.1	8.4
Plan amendments		2.2
Employee contributions	20.6	18.1
Benefits paid	(36.5)	(36.9)
Actuarial loss (gain)	77.8	6.0
Expenses paid	(0.3)	(0.3)
Translation gain (loss)	19.7	(9.7)
Projected benefit obligation - end of year	$ 740.4	$ 631.1	$ 623.6