Component of Provision for Income Tax Attributable To Continuing Operation (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax expense:
U.S. federal	$ 87.1	$ 63.1	$ 52.9
Foreign	86.0	86.2	67.3
State and local	10.7	9.1	7.7
Total	183.8	158.4	127.9
Deferred income tax expense (benefit):
U.S. federal	(47.4)	7.9	26.8
Foreign	(14.0)	(15.8)	(2.6)
State, local and other, net of federal tax benefit	7.9	(2.8)	(4.5)
Total	(53.5)	(10.7)	19.7
Total income tax provision	$ 130.3	$ 147.7	$ 147.6