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Share-Based Payments - Incentive Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Stock Incentive Plans      
Compensation expense related to employer contributions under defined contribution plans, including the DCP $ 26.8 $ 13.3 $ 14.4
Employee Stock Option      
Stock Incentive Plans      
Securities available for future issuance (in shares) 10,900,000    
Expiration term of unexercised options 7 years    
Number of Options      
Balance at the beginning of the period (in shares) 1,300,000 1,600,000 1,600,000
Granted (in shares)     600,000
Exercised (in shares) (400,000) (300,000) (500,000)
Cancelled (in shares)     (100,000)
Balance at the end of the period (in shares) 900,000 1,300,000 1,600,000
Exercisable at the end of the period (in shares) 300,000 700,000 900,000
Stock options, Weighted Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 28.26 $ 27.69 $ 24.73
Granted (in dollars per share)     31.62
Exercised (in dollars per share) 23.96 24.98 23.64
Cancelled (in dollars per share)     26.87
Balance at the end of the period (in dollars per share) 30.36 28.26 27.69
Exercisable at the end of the period (in dollars per share) $ 26.99 $ 25.04 $ 25.16