Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current U.S. federal	$ 31.6	$ 53.4	$ 79.2
Current Non-U.S.	192.7	162.8	167.6
Current U.S. state and local	10.1	9.9	3.5
Deferred U.S. federal	0.8	21.8	(15.8)
Deferred Non-U.S.	(0.2)	(44.4)	(9.7)
Deferred U.S. state and local	(0.1)	0.9	(0.5)
Total income tax expense	$ 234.9	$ 204.4	$ 224.3