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Share-based Payments (Tables) | 6 Months Ended
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Mar. 31, 2022
Share-based Payments |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ | ​ | Shares of stock | ​ | Weighted average | ​ | Shares of stock | ​ | Weighted average
​ |  | under options |  | exercise price |  | under options |  | exercise price
​ | ​ | (in millions) | ​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Outstanding at September 30 | ​ | 0.3 | ​ | $ | 38.72 | ​ | 0.4 | ​ | $ | 36.41
Options granted | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | —
Options exercised | ​ | — | ​ | ​ | — | ​ | (0.1) | ​ | ​ | 31.62
Options forfeited or expired | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | —
Outstanding at March 31 | ​ | 0.3 | ​ | ​ | 38.72 | ​ | 0.3 | ​ | ​ | 38.72
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested and expected to vest in the future as of March 31 | ​ | 0.2 | ​ | $ | 38.72 | ​ | 0.2 | ​ | $ | 38.72

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