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Share-based Payments (Tables) | 9 Months Ended
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Jun. 30, 2019
Share-based Payments |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019 | ​ | 2018
​ | ​ | 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, prior year | ​ | 0.6 | ​ | $ | 31.62 |  | 0.7 | ​ | $ | 31.11
Options granted |  | — | ​ |  | — |  | — | ​ |  | —
Options exercised |  | — | ​ |  | — |  | (0.1) | ​ |  | 27.79
Options forfeited or expired |  | (0.5) | ​ |  | (31.62) |  | — | ​ |  | —
Outstanding at June 30 |  | 0.1 | ​ |  | 31.62 |  | 0.6 | ​ |  | 31.62
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested and expected to vest in the future as of June 30 | ​ | 0.1 | ​ | $ | 31.62 |  | 0.6 | ​ | $ | 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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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