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Stock Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2010
Deferred Compensation Plan        
Compensation expense related to employer contributions under defined contribution plans, including the DCP $ 14.4 $ 14.6 $ 15.9  
Employee Stock Option [Member]
        
Stock Incentive Plans        
Securities available for future issuance (in shares) 19,800,000      
Expiration term of unexercised options 7 years      
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 7.83      
Number of Options        
Balance at the beginning of the period (in shares) 1,600,000 2,500,000   2,900,000
Granted (in shares) 600,000      
Exercised (in shares) (500,000) (800,000) (400,000)  
Cancelled (in shares) (100,000) (100,000)    
Balance at the end of the period (in shares) 1,600,000 1,600,000 2,500,000 2,900,000
Exercisable at the end of the period (in shares) 900,000 1,400,000 2,100,000  
Stock options, Weighted Average Exercise Price        
Balance at the beginning of the period (in dollars per share) $ 24.73 $ 22.81   $ 21.38
Granted (in dollars per share) $ 31.62      
Exercised (in dollars per share) $ 23.64 $ 18.31 $ 11.40  
Cancelled (in dollars per share) $ 26.87 $ 26.83 $ 26.23  
Balance at the end of the period (in dollars per share) $ 27.69 $ 24.73 $ 22.81 $ 21.38
Exercisable at the end of the period (in dollars per share) $ 25.16 $ 24.51 $ 22.07  
Restricted and Performance Stock Award [Member]
        
Stock Incentive Plans        
Securities available for future issuance (in shares) 9,900,000