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Share-based Payments (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Compensation expense      
Recognized compensation expense $ 98.1 $ 26.0  
Accelerated compensation expense 43.9    
Accelerated settlement Of Common Stock 17.6    
Award settlement Of Cash 26.3    
Unrecognized compensation expense $ 145.4   $ 62.4
Vesting period 3 years    
Employee Stock Option      
Number of Options      
Balance at the beginning of the period (in shares) 1.6 1.6  
Granted (in shares)   0.6  
Exercised (in shares) (0.3) (0.4)  
Cancelled (in shares)   (0.1)  
Balance at the end of the period (in shares) 1.3 1.7  
Vested and expected to vest in the future at the end of the period (in shares) 1.3 1.7  
Stock options, Weighted Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 27.69 $ 24.73  
Granted (in dollars per share)   31.62  
Exercised (in dollars per share) 25.02 22.99  
Cancelled (in dollars per share)   26.86  
Balance at the end of the period (in dollars per share) 28.22 27.57  
Vested and expected to vest in the future at the end of the period (in dollars per share) $ 28.22 27.57  
Performance Earnings Program      
Compensation expense      
Vesting period 3 years    
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 32.32 29.32  
Restricted Stock Units (RSUs)      
Compensation expense      
Granted (in shares) 2.6    
Granted (in dollars per share) $ 30.04    
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 31.06 $ 29.50