Components of Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision:
Federal	$ 322.9	$ 521.8	$ 482.4
State	41.7	61.1	59.0
Foreign	213.2	205.4	215.4
Current Income Tax Expense (Benefit), Total	577.8	788.3	756.8
Deferred provision (benefit):
Federal	31.5	(57.8)	(88.3)
State	4.8	5.3	0.3
Foreign	(5.4)	(2.7)	(10.0)
Deferred taxes	30.9	(55.2)	(98.0)
Income taxes	$ 608.7	$ 733.1	$ 658.8