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Stock-Based Compensation - Summary of Incentive Equity Awards (Parenthetical) (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Intrinsic values of stock options exercised $ 6.0 $ 10.0
Outstanding "in the money" stock options using current period closing stock price $ 39.52 $ 39.52
Shares, outstanding 8.0 8.0
Outstanding "in the money" stock options aggregate intrinsic value 156.3 156.3
Stock options outstanding, weighted-average remaining contractual life   5 years 2 months 12 days
Stock options exercisable 8.0 8.0
Time-Based Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share price $ 39.52 $ 39.52
Shares 2.5 2.5
Aggregate intrinsic value 100.3 100.3
Performance-Based Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share price $ 39.52 $ 39.52
Shares 0.8 0.8
Aggregate intrinsic value 33.2 33.2
Intrinsic values of Performance-based restricted stock units $ 0.1 $ 0.1