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Income Taxes - Summary of Activity Related to Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Income Tax Disclosure [Abstract]      
Beginning balance $ 62.6 $ 47.0 $ 16.7
Gross increase related to prior period tax positions 1.9 9.2 31.4
Gross increase related to current period tax positions 2.2 6.4 2.6
Gross decrease related to prior period tax positions (36.7)   (3.7)
Balance at June 30, $ 30.0 $ 62.6 $ 47.0