Retirement Benefit Plan - Summary of Amounts Recognized in Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Short-term accrued benefit liability	$ (0.2)	$ (0.2)
Long-term accrued benefit liability	(26.9)	(7.3)
Net amount recognized	(27.1)	(7.5)
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prepaid pension	17.6	15.3
Short-term accrued benefit liability	(1.1)	(0.8)
Long-term accrued benefit liability	(91.7)	(59.8)
Net amount recognized	$ (75.2)	$ (45.3)