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Share-based Payments - Restricted stock units and PEP units activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Other disclosures      
Unrecognized compensation expense $ 70.3   $ 48.3
Recognition period of unrecognized compensation expense 3 years   3 years
Restricted Stock Units      
Units      
Outstanding at beginning (in units) 0.8 1.0 1.0
Granted (in units) 0.3 0.3  
Vested (in shares) (0.3) (0.4)  
Outstanding at ending (in units) 0.8 0.9 0.8
Weighted Average Grant-Date Fair Value      
Outstanding at beginning (in USD per unit) $ 68.34 $ 53.05 $ 53.05
Granted (in USD per unit) 92.30 83.64  
Vested (in USD per unit) 50.04 45.01  
Outstanding at ending (in USD per unit) $ 83.95 $ 65.96 $ 68.34
Other disclosures      
Compensation expense related to share-based payments $ 44.8 $ 40.9  
PEP Units      
Share-based Payments      
Vesting period 3 years    
Units      
Outstanding at beginning (in units) 0.7 0.7 0.7
Granted (in units) 0.2 0.2  
PEP units earned (in units) 0.2 0.2  
Vested (in shares) (0.4) (0.4)  
Outstanding at ending (in units) 0.7 0.7 0.7
Weighted Average Grant-Date Fair Value      
Outstanding at beginning (in USD per unit) $ 75.54 $ 60.60 $ 60.60
Granted (in USD per unit) 104.82 94.64  
PEP units earned (in USD per unit) 52.49 43.19  
Vested (in USD per unit) 52.49 43.19  
Outstanding at ending (in USD per unit) $ 95.37 $ 75.67 $ 75.54