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Share-based Payments (Tables)
6 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Units and PEP Units Activity
Restricted stock units and PEP unit activity for the six months ended March 31 was as follows:
20252024
Restricted
Stock Units
Weighted
Average
Grant-Date
Fair Value
PEP UnitsWeighted
Average
Grant-Date
Fair Value
Restricted
 Stock Units
Weighted
Average
Grant-Date
Fair Value
PEP UnitsWeighted
Average
Grant-Date
Fair Value
(in millions)(in millions)(in millions)(in millions)
Outstanding at September 30, 0.8$83.96 0.7$95.38 0.8$68.34 0.7$75.54 
Granted0.2$110.73 0.2$129.37 0.3$92.32 0.2$104.82 
PEP units earned$— 0.1$85.46 $— 0.2$52.49 
Vested(0.2)$75.79 (0.3)$85.46 (0.3)$49.99 (0.4)$52.49 
Outstanding at March 31, 0.8$95.54 0.7$109.67 0.8$83.90 0.7$95.37