Income Taxes - Components of Income Tax Expense (Benefit) From Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal, Current	$ 112.7	$ 50.1	$ (15.1)
Federal, Deferred	(34.9)	(64.3)	(23.9)
State, Current	15.8	13.9	(4.8)
State, Deferred	(7.5)	(3.8)	(2.6)
Foreign, Current	37.0	49.3	51.8
Foreign, Deferred	6.3	(18.9)	(14.6)
Total	$ 129.4	$ 26.3	$ (9.2)