Income Taxes - Components of Income Tax Expense (Benefit) From Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal, Current	$ (7.3)	$ 8.5	$ (70.4)
Federal, Deferred	(51.7)	(11.9)	(10.5)
State, Current	(6.0)	(8.3)	(11.7)
State, Deferred	12.5	(4.6)	6.1
Foreign, Current	34.4	19.7	39.5
Foreign, Deferred	5.8	17.6	(9.2)
Total	$ (12.3)	$ 21.0	$ (56.2)