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Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]      
Current, Federal $ 17.2 $ 22.2 $ 53.7
Current, State 2.4 3.5 4.7
Total Current 19.6 25.7 58.4
Deferred, Federal 2.0 15.4 (2.1)
Deferred, State (1.7) (3.2) 8.7
Foreign (1.7) 3.5 (2.3)
Change in valuation allowance 3.1 2.2 (8.0)
Total Deferred 1.7 17.9 (3.7)
Total income tax expense $ 21.3 $ 43.6 $ 54.7