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Share-Based Payments (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Other disclosures      
Unrecognized compensation expense $ 62.4   $ 45.9
Recognition period of unrecognized compensation expense 3 years   3 years
PEP Units      
Share-based Payments      
Vesting period 3 years    
Units      
Outstanding at September 30 (in units) 0.7 1.2 1.2
Granted (in units) 0.2 0.2  
PEP units earned (in units) 0.2 0.6  
Vested (in shares) (0.4) (1.3)  
Outstanding at June 30 (in units) 0.7 0.7 0.7
Weighted Average Grant-Date Fair Value      
Outstanding at September 30 (in USD per unit) $ 60.60 $ 37.22 $ 37.22
Granted (in USD per unit) 94.64 85.46  
PEP units earned (in USD per unit) 43.19 27.90  
Vested (in USD per unit) 43.19 27.90  
Outstanding at June 30 (in USD per unit) $ 75.67 $ 60.68 $ 60.60
Restricted Stock Units (RSUs)      
Units      
Outstanding at September 30 (in units) 1.0 1.3 1.3
Granted (in units) 0.3 0.3  
Vested (in shares) (0.4) (0.5)  
Outstanding at June 30 (in units) 0.9 1.1 1.0
Weighted Average Grant-Date Fair Value      
Outstanding at September 30 (in USD per unit) $ 53.05 $ 38.88 $ 38.88
Granted (in USD per unit) 83.64 74.30  
Vested (in USD per unit) 45.01 29.38  
Outstanding at June 30 (in USD per unit) $ 65.96 $ 53.06 $ 53.05
Other disclosures      
Compensation expense related to share-based payments $ 40.9 $ 27.4