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Employee Benefit Plans - Stock Options (Details) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Stock Options      
Outstanding at beginning of year, shares 11,395,917 15,337,656 19,478,811
Exercised, shares (2,770,569) (3,504,989) (3,636,655)
Canceled or expired, shares (194,000) (436,750) (504,500)
Outstanding at end of year, shares 8,431,348 11,395,917 15,337,656
Exercisable at end of year, shares 5,772,214 6,645,967 6,859,889
Weighted Average Exercise Price      
Outstanding at beginning of year, weighted average exercise price, per share $ 16.69 $ 17.50 $ 17.37
Exercised, weighted average exercise price, per share 15.83 20.02 16.49
Canceled or expired, weighted average exercise price, per share 18.83 18.45 19.89
Outstanding at end of year, weighted average exercise price, per share 16.92 16.69 17.50
Exercisable at end of year, weighted average exercise price, per share $ 16.01 $ 14.99 $ 16.51
Additional information - stock options      
Expiration period 10 years    
Total intrinsic value of options exercised $ 49.5 $ 39.2 $ 44.6
Aggregate intrinsic value of options outstanding 194.0    
Aggregate intrinsic value of options exercisable $ 138.0    
Lower range of options outstanding exercise price $ 9.03    
Upper range of options outstanding exercise price $ 23.86    
Weighted average remaining contractual term of options outstanding 4 years    
Weighted average remaining contractual term of options exercisable 3 years 11 months    
Stock based compensation expense $ 15.1 $ 20.5 $ 28.9
Unrecognized compensation expense related to options $ 9.0    
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 4 months    
Minimum [Member]      
Additional information - stock options      
Vesting period 2 years    
Maximum [Member]      
Additional information - stock options      
Vesting period 9 years 9 months