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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]      
Income (loss) before income taxes, United States $ 169.5 $ 147.0 $ 292.0
Income (loss) before income taxes, Foreign (0.6) (12.1) (14.2)
Income before income tax $ 168.9 $ 134.9 $ 277.8