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Share-Based Payments | 3 Months Ended
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Dec. 31, 2022
Share-based Payments |
Share-based Payments | 9. Share-based Payments ​ The Company grants stock units to employees under its Performance Earnings Program (PEP), whereby units are earned and issued dependent upon meeting established cumulative performance objectives and vest over a three-year service period. Additionally, the Company issues restricted stock units to employees which are earned based on service conditions. The grant date fair value of PEP awards and restricted stock unit awards is primarily based on that day’s closing market price of the Company’s common stock. Restricted stock units and PEP units activity for the three months ended December 31 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
​ |  | ​ |  | 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, | ​ | 1.0 | ​ | $ | 53.05 | ​ | 0.7 | ​ | $ | 60.60 | ​ | 1.3 | ​ | $ | 38.88 | ​ | 1.2 | ​ | $ | 37.22
Granted | ​ | 0.3 | ​ | $ | 83.60 | ​ | 0.2 | ​ | $ | 94.65 | ​ | 0.3 | ​ | $ | 74.70 | ​ | 0.3 | ​ | $ | 85.48
PEP units earned |  | — | ​ | $ | — |  | 0.2 | ​ | $ | 43.19 |  | — | ​ | $ | — |  | 0.6 | ​ | $ | 27.90
Vested |  | (0.4) | ​ | $ | 43.44 |  | (0.4) | ​ | $ | 43.19 |  | (0.5) | ​ | $ | 27.63 |  | (1.3) | ​ | $ | 27.89
Outstanding at December 31, |  | 0.9 | ​ | $ | 65.61 |  | 0.7 | ​ | $ | 75.73 |  | 1.1 | ​ | $ | 52.52 |  | 0.8 | ​ | $ | 60.15
​ Total compensation expense related to these share-based payments including stock options was $11.9 million and $9.8 million during the three months ended December 31, 2022 and 2021, respectively. Unrecognized compensation expense related to total share-based payments outstanding as of December 31, 2022 and September 30, 2022 was $71.7 million and $45.9 million, respectively, to be recognized on a straight-line basis over the awards’ respective vesting periods which are generally three years.

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