Retirement Benefit Plan - Summary of Amounts Recognized in Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prepaid pension	$ 24.0	$ 14.6
Short-term accrued benefit liability	(0.4)	(1.0)
Long-term accrued benefit liability	(11.1)	(14.6)
Net amount recognized	12.5	(1.0)
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prepaid pension	10.2	16.5
Short-term accrued benefit liability	(0.7)	(0.6)
Long-term accrued benefit liability	(71.1)	(78.9)
Net amount recognized	$ (61.6)	$ (63.0)