Income before Provision for Income Taxes, Classified by Source of Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Document Fiscal Year Focus	2018
U.S.	$ 2,218.0	$ 2,242.0	$ 2,059.4
Outside the U.S.	5,598.1	6,331.5	4,806.6
Income before provision for income taxes	$ 7,816.1	$ 8,573.5	$ 6,866.0