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Share-based Payments (Tables) | 3 Months Ended
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Dec. 31, 2023
Share-based Payments |
Schedule of restricted stock units and PEP units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
​ |  | ​ |  | Weighted |  | ​ |  | Weighted |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | Restricted | ​ | Grant-Date | ​ | ​ | ​ | Grant-Date | ​ | Restricted | ​ | Grant-Date | ​ | ​ | ​ | Grant-Date
​ | ​ | Stock Units | ​ | Fair Value | ​ | PEP Units | ​ | Fair Value | ​ | Stock Units | ​ | Fair Value | ​ | PEP Units | ​ | Fair Value
​ | ​ | (in millions) | ​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Outstanding at September 30, | ​ | 0.8 | ​ | $ | 68.34 | ​ | 0.7 | ​ | $ | 75.54 | ​ | 1.0 | ​ | $ | 53.05 | ​ | 0.7 | ​ | $ | 60.60
Granted | ​ | 0.3 | ​ | $ | 92.27 | ​ | 0.2 | ​ | $ | 104.66 | ​ | 0.3 | ​ | $ | 83.60 | ​ | 0.2 | ​ | $ | 94.65
PEP units earned |  | — | ​ | $ | — | ​ | 0.2 | ​ | $ | 52.50 | ​ | — | ​ | $ | — | ​ | 0.2 | ​ | $ | 43.19
Vested |  | (0.3) | ​ | $ | 47.82 | ​ | (0.4) | ​ | $ | 52.50 | ​ | (0.4) | ​ | $ | 43.44 | ​ | (0.4) | ​ | $ | 43.19
Outstanding at December 31, |  | 0.8 | ​ | $ | 83.56 | ​ | 0.7 | ​ | $ | 95.29 | ​ | 0.9 | ​ | $ | 65.61 | ​ | 0.7 | ​ | $ | 75.73

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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