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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 9 Months Ended 1 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Mar. 31, 2013
Time-based restricted stock units [Member]
Jul. 31, 2012
Performance-based restricted stock units [Member]
Mar. 31, 2013
Performance-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of stock options exercised $ 4.0 $ 9.8      
Outstanding "in the money" stock options fiscal year-end share price $ 24.84 $ 24.84      
Shares, outstanding 9.4 9.4      
Outstanding "in the money" stock options aggregate intrinsic value 53.1 53.1      
Performance-based restricted stock units, outstanding     2.8   0.8
Time-based restricted stock units aggregate intrinsic value     69.4   19.6
Stock options outstanding, weighted-average remaining contractual life   5 years 3 months 18 days      
Stock options exercisable 9.7 9.7      
Performance-based restricted stock units that vested during the period       $ 1.3 $ 0.3