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Share-based Payments (Tables) | 9 Months Ended
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Jun. 30, 2018
Share-based Payments |
Schedule of stock option activity | Stock option activity for the nine months ended June 30 was as follows:
|  | 2018 |  | 2017 |
|  | Shares of stock under options |  | Weighted average exercise price |  | Shares of stock under options |  | Weighted average exercise price |
|  | (in millions) |  |  |  | (in millions) |  |  |
Outstanding at September 30, prior year |  | 0.7 |  | $ | 31.11 |  | 0.9 |  | $ | 30.36 |
Options granted |  | — |  | — |  | — |  | — |
Options exercised |  | (0.1 | ) | 27.79 |  | (0.2 | ) | 26.42 |
Options forfeited or expired |  | — |  | — |  | — |  | — |
Outstanding at June 30 |  | 0.6 |  | 31.62 |  | 0.7 |  | 31.11 |
Vested and expected to vest in the future as of June 30 |  | 0.6 |  | $ | 31.62 |  | 0.7 |  | $ | 31.11 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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