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Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Current:      
U.S. Domestic $ 120.8 $ 114.8 $ 73.1
Foreign 19.8 22.5 15.8
State 10.6 6.8 8.1
Total current 151.2 144.1 97.0
Deferred:      
U.S. Domestic 4.5 (8.7) 16.0
Foreign (0.9) (0.4) 0.0
State (3.0) (2.5) (1.9)
Total deferred 0.6 (11.6) 14.1
Total Provision for income taxes $ 151.8 $ 132.5 $ 111.1