Component of Provision for Income Tax Attributable To Continuing Operation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax expense:
U.S. federal	$ 111.3	$ 87.1	$ 63.1
Foreign	62.0	86.0	86.2
State and local	18.5	10.7	9.1
Total	191.8	183.8	158.4
Deferred income tax expense (benefit):
U.S. federal	(57.8)	(47.4)	7.9
Foreign	(2.8)	(14.0)	(15.8)
State, local and other, net of federal tax benefit	3.9	7.9	(2.8)
Total	(56.7)	(53.5)	(10.7)
Total income tax provision	$ 135.1	$ 130.3	$ 147.7