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Share-Based Payments - Restricted stock unit, PEP unit, and Stock Option activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Stock options, Weighted average exercise price      
Recognized compensation expense $ 45.9 $ 38.5 $ 44.7
Unrecognized compensation expense 48.3 45.9  
Other disclosures      
Compensation expense related to share-based payments 45.9 38.5 $ 44.7
Unrecognized compensation expense $ 48.3 $ 45.9  
Recognition period of unrecognized compensation expense 3 years 3 years  
Restricted Stock Units      
Units      
Outstanding at beginning (in units) 1.0 1.3 2.1
Granted (in units) 0.3 0.3 0.4
Vested (in shares) (0.4) (0.5) (0.9)
Cancelled (in shares) (0.1) (0.1) (0.3)
Outstanding at ending (in units) 0.8 1.0 1.3
Weighted Average Grant-Date Fair Value      
Outstanding at beginning (in USD per unit) $ 53.05 $ 38.88 $ 35.56
Granted (in USD per unit) 83.64 74.30 49.21
Vested (in USD per unit) 44.35 29.44 36.24
Cancelled (in USD per unit) 62.09 49.74 36.89
Outstanding at ending (in USD per unit) $ 68.34 $ 53.05 $ 38.88
PEP Units      
Units      
Outstanding at beginning (in units) 0.7 1.2 1.6
Granted (in units) 0.2 0.2 0.3
PEP units earned (unearned) (in shares) 0.2 0.6 0.1
Vested (in shares) (0.4) (1.3) (0.6)
Cancelled (in shares)     (0.2)
Outstanding at ending (in units) 0.7 0.7 1.2
Weighted Average Grant-Date Fair Value      
Outstanding at beginning (in USD per unit) $ 60.60 $ 37.22 $ 33.86
Granted (in USD per unit) 94.64 85.46 52.76
PEP units earned (unearned) (in USD per share) 43.19 27.90 37.37
Vested (in USD per unit) 43.19 27.90 38.13
Cancelled (in USD per unit) 71.71 56.64 37.53
Outstanding at ending (in USD per unit) $ 75.54 $ 60.60 $ 37.22
Stock Options      
Shares of stock under options      
Balance at the beginning of the period (in shares) 0.3 0.3 0.4
Options exercised (in shares) (0.2)   (0.1)
Balance at the end of the period (in shares) 0.1 0.3 0.3
Stock options, Weighted average exercise price      
Balance at the beginning of the period (in dollars per share) $ 38.72 $ 38.72 $ 36.41
Options exercised (in dollars per share) 38.72   31.62
Balance at the end of the period (in dollars per share) $ 38.72 $ 38.72 $ 38.72