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Share-based Payments (Tables) | 12 Months Ended
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Sep. 30, 2020
Share-Based Payments |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted
​ | ​ | Options | ​ | Average
​ |  | (in millions) |  | Exercise Price
Balance, September 30, 2017 |  | 0.7 | ​ | ​ | 31.11
Granted |  | — | ​ | ​ | —
Exercised |  | (0.1) | ​ | ​ | 27.79
Cancelled |  | — | ​ | ​ | —
Balance, September 30, 2018 |  | 0.6 | ​ | ​ | 31.62
Granted |  | — | ​ | ​ | —
Exercised |  | — | ​ | ​ | —
Cancelled |  | (0.5) | ​ | ​ | (31.62)
Balance, September 30, 2019 |  | 0.1 | ​ | ​ | 31.62
Granted |  | 0.3 | ​ | ​ | 38.72
Exercised |  | — | ​ | ​ | —
Cancelled |  | — | ​ | ​ | —
Balance, September 30, 2020 |  | 0.4 | ​ | ​ | 36.41
Exercisable as of September 30, 2018 |  | — | ​ | ​ | N/A
Exercisable as of September 30, 2019 |  | 0.1 | ​ | ​ | 31.62
Exercisable as of September 30, 2020 |  | 0.1 | ​ | ​ | 31.62
​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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