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Share-based Payments (Tables) | 3 Months Ended
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Dec. 31, 2020
Share-based Payments |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019
​ | ​ | 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 | ​ | 0.4 | ​ | $ | 36.41 |  | 0.1 | ​ | $ | 31.62
Options granted |  | — | ​ |  | — |  | — | ​ |  | —
Options exercised |  | — | ​ |  | — |  | — | ​ |  | —
Options forfeited or expired |  | — | ​ |  | — |  | — | ​ |  | —
Outstanding at December 31 |  | 0.4 | ​ |  | 36.41 |  | 0.1 | ​ |  | 31.62
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested and expected to vest in the future as of December 31 | ​ | 0.1 | ​ | $ | 31.62 |  | 0.1 | ​ | $ | 31.62

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