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Schedule of Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 6.8 $ 7.6 $ 9.0
Addition Charged to Cost and Expenses 37.3 33.3 31.5
Net Deductions and Other [1] (35.9) (34.1) (32.9)
Balance at End of Period $ 8.2 $ 6.8 $ 7.6
[1] Primarily represents the write-off of accounts receivables net of recoveries.