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Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Income Taxes [Line Items]      
Current, Federal $ 53.7 $ 97.4 $ 80.3
Current, State 4.7 3.5 6.0
Total Current 58.4 100.9 86.3
Deferred, Federal (2.1) (0.7) 0.7
Deferred, State 8.7 0.8 (0.4)
Foreign (2.3) (2.9) (2.1)
Change in valuation allowance (8.0) 3.5 1.6
Total Deferred (3.7) 0.7 (0.2)
Total income tax expense $ 54.7 $ 101.6 $ 86.1