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Share-Based Payments (Tables) | 12 Months Ended
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Sep. 30, 2018
Share-Based Payments |
Schedule of stock option activity |
|  | Number of |  | Weighted
|  | Options |  | Average
|  | (in millions) |  | Exercise Price
Balance, September 30, 2015 |  | 1.3 |  |  | 28.26
Granted |  | — |  |  | —
Exercised |  | (0.4) |  |  | 23.96
Cancelled |  | — |  |  | —
Balance, September 30, 2016 |  | 0.9 |  |  | 30.36
Granted |  | — |  |  | —
Exercised |  | (0.2) |  |  | 26.42
Cancelled |  | — |  |  | —
Balance, September 30, 2017 |  | 0.7 |  |  | 31.11
Granted |  | — |  |  | —
Exercised |  | (0.1) |  |  | 27.79
Cancelled |  | — |  |  | —
Balance, September 30, 2018 |  | 0.6 |  |  | 31.62
Exercisable as of September 30, 2016 |  | 0.3 |  |  | 26.99
Exercisable as of September 30, 2017 |  | 0.1 |  |  | 27.79
Exercisable as of September 30, 2018 |  | — |  |  | N/A
Summary of information concerning outstanding and exercisable options |
|  | Options Outstanding |  |  |  |  | Options Exercisable
|  | Number |  |  |  |  |  |  |  | Number |  |  |  |
|  | Outstanding |  | Weighted |  |  |  |  |  | Exercisable |  | Weighted |  |
|  | as of |  | Average |  | Weighted |  | Aggregate |  | as of |  | Average |  | Weighted
|  | September 30, |  | Remaining |  | Average |  | Intrinsic |  | September 30, |  | Remaining |  | Average
|  | 2018 |  | Contractual |  | Exercise |  | Value |  | 2018 |  | Contractual |  | Exercise
|  | (in millions) |  | Life |  | Price |  | (in millions) |  | (in millions) |  | Life |  | Price
Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$31.62 |  | 0.6 |  | 5.43 |  | $ | 31.62 |  | $ | 0.7 |  | — |  |  |  |  | —

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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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