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Share-based Payments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Stock options, weighted average exercise price |  |  |
Unrecognized compensation expense | $ 149.8 |  | $ 91.8
Recognized compensation expense | $ 21.3 | $ 21.5 |
Vesting period | 3 years |  |
Employee Stock Option |  |  |
Shares of stock under options |  |  |
Balance at the beginning of the period (in shares) | 0.9 | 1.3 |
Exercised (in shares) | (0.1) | (0.2) |
Balance at the end of the period (in shares) | 0.8 | 1.1 |
Vested and expected to vest in the future at the end of the period (in shares) | 0.8 | 1.1 |
Stock options, weighted average exercise price |  |  |
Balance at the beginning of the period (in dollars per share) | $ 30.36 | $ 28.26 |
Exercised (in dollars per share) | 25.46 | 23.94 |
Balance at the end of the period (in dollars per share) | 30.86 | 28.92 |
Vested and expected to vest in the future at the end of the period (in dollars per share) | $ 30.86 | 28.92 |
Performance Earnings Program |  |  |
Stock options, weighted average exercise price |  |  |
Vesting period | 3 years |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 38.16 | 29.92 |
Restricted Stock Units (RSUs) |  |  |
Stock options, weighted average exercise price |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 38.08 | $ 29.92 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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