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Stock Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
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      
Stock Incentive Plans      
Securities available for future issuance (in shares) 19,800,000    
Expiration term of unexercised options 7 years    
Number of Options      
Balance at the beginning of the period (in shares) 1,600,000 2,500,000  
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
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  
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
Exercisable at the end of the period (in dollars per share) $ 25.16 $ 24.51 $ 22.07
Performance Earnings Program      
Compensation expense      
Unrecognized compensation expense $ 62.4    
Vesting period 3 years    
Restricted Stock Units (RSUs)      
Compensation expense      
Recognized compensation expense $ 34.4 $ 32.6 $ 26.6
Restricted and Performance Stock Award [Member]      
Stock Incentive Plans      
Securities available for future issuance (in shares) 9,900,000