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Employee Benefit Plans - Stock Options (Details) - Share-based Payment Arrangement, Option [Member] - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Stock Options      
Outstanding at beginning of year, shares 2,224,415 3,184,157 5,856,959
Exercised, shares (1,108,639) (959,742) (2,634,802)
Canceled or expired, shares 0 0 (38,000)
Outstanding at end of year, shares 1,115,776 2,224,415 3,184,157
Exercisable at end of year, shares 1,115,776 2,224,415 3,184,157
Weighted Average Exercise Price      
Outstanding at beginning of year, weighted average exercise price, per share $ 19.94 $ 19.53 $ 17.25
Exercised, weighted average exercise price, per share 16.02 18.58 14.47
Canceled or expired, weighted average exercise price, per share 0 0 18.98
Outstanding at end of year, weighted average exercise price, per share 23.84 19.94 19.53
Exercisable at end of year, weighted average exercise price, per share $ 23.84 $ 19.94 $ 19.53
Additional information - stock options      
Expiration period 10 years    
Total intrinsic value of options exercised $ 82.5 $ 41.2 $ 70.6
Aggregate intrinsic value of options outstanding $ 67.1    
Lower range of options outstanding exercise price $ 23.57    
Upper range of options outstanding exercise price $ 23.86    
Weighted average remaining contractual term of options outstanding 2 years 1 month 6 days