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Income Taxes (Summary Of The Activity Related To Unrecognized Tax Benefits) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Beginning balance $ 47.0 $ 16.7 $ 11.5
Gross increase related to prior period tax positions 9.2 31.4 5.2
Gross increase related to current period tax positions 6.4 2.6  
Gross decrease related to prior period tax positions - Statute expiration   (3.7)  
Balance at June 30, $ 62.6 $ 47.0 $ 16.7