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Income Taxes - Schedule of Provision for (Benefit from) Income Taxes Continuing Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current income taxes:      
Federal $ (5.5) $ 28.7 $ 98.2
State (1.7) 4.7 12.8
Foreign 5.5 (0.2) 7.8
Total current (1.7) 33.2 118.8
Deferred income taxes:      
Federal (35.6) (16.2) (49.5)
State (2.7) (1.1) (2.1)
Foreign (3.9) (1.6) (4.3)
Total deferred (42.2) (18.9) (55.9)
Provision for (benefit from) income taxes $ (43.9) $ 14.3 $ 62.9