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Income Taxes - Schedule of Income (Loss) from Continuing Operations Before Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income (loss) from continuing operations before taxes      
United States operations $ (837.6) $ 62.5 $ 181.0
Foreign operations (55.4) 15.9 31.5
Loss before income taxes $ (893.0) $ 78.4 $ 212.5