Reconciliation of United States Federal Statutory Tax Rate to Effective Tax Rate on Income Before Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. statutory tax rate	35.00%	35.00%	35.00%
State and local taxes, net of federal tax benefit	3.00%	3.60%	2.90%
Benefit of foreign operations	(5.80%)	(7.40%)	(6.40%)
Legacy tax items	(0.20%)	(0.20%)	(0.60%)
Other	(0.80%)	0.10%	(0.70%)
Effective tax rate	31.20%	31.10%	30.20%
Income tax paid	$ 397.4	$ 369.4	$ 335.7