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Share-based payments (Tables) | 6 Months Ended
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Mar. 31, 2016
Share-based Payments |
Schedule of stock option activity |
|  | 2016 |  | 2015 |
|  | 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 |  | 1.3 |  | $ | 28.26 |  | 1.6 |  | $ | 27.69 |
Options granted |  | — |  | — |  | — |  | — |
Options exercised |  | (0.2 | ) | 23.36 |  | (0.1 | ) | 25.82 |
Options forfeited or expired |  | — |  | — |  | — |  | 27.08 |
Outstanding at March 31 |  | 1.1 |  | 29.44 |  | 1.5 |  | 27.89 |
Vested and expected to vest in the future as of March 31 |  | 1.1 |  | $ | 29.44 |  | 1.5 |  | $ | 27.89 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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