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Employee Benefit Plans - Stock Options (Details) - Employee Stock Option [Member] $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) grant_recipient $ / shares shares
Stock Options |  |  |
Outstanding at beginning of year, shares | shares | 15,337,656 | 19,478,811 | 18,962,536
Granted, shares | shares | 0 | 0 | 3,856,166
Exercised, shares | shares | (3,504,989) | (3,636,655) | (2,687,724)
Canceled or expired, shares | shares | (436,750) | (504,500) | (652,167)
Outstanding at end of year, shares | shares | 11,395,917 | 15,337,656 | 19,478,811
Exercisable at end of year, shares | shares | 6,645,967 | 6,859,889 | 7,207,978
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year, weighted average exercise price, per share | $ 17.50 | $ 17.37 | $ 15.91
Granted, weighted average exercise price, per share | 0.00 | 0.00 | 23.85
Exercised, weighted average exercise price, per share | 31.21 | 28.75 | 16.30
Canceled or expired, weighted average exercise price, per share | 18.45 | 19.89 | 17.68
Outstanding at end of year, weighted average exercise price, per share | 16.69 | 17.50 | 17.37
Exercisable at end of year, weighted average exercise price, per share | $ 14.99 | $ 16.51 | $ 16.27
Assumptions used in Black-Scholes option valuation model |  |  |
Risk free interest rate |  |  | 2.01%
Expected life (in years) |  |  | 6 years 5 months 24 days
Expected volatility |  |  | 48.80%
Expected dividend yield |  |  | 0.63%
Additional information - stock options |  |  |
Expiration period | 10 years |  | 10 years
Total intrinsic value of options exercised | $ | $ 39.2 | $ 44.6 | $ 18.0
Aggregate intrinsic value of options outstanding | $ | 154.0 |  |
Aggregate intrinsic value of options exercisable | $ | $ 101.1 |  |
Lower range of options outstanding exercise price | $ 9.03 |  |
Upper range of options outstanding exercise price | $ 23.86 |  |
Weighted average remaining contractual term of options outstanding | 4 years 9 months |  |
Weighted average remaining contractual term of options exercisable | 4 years 7 months |  |
Stock Option Grant Recipients | grant_recipient |  |  | 520
Weighted average fair value per share of options granted |  |  | $ 11.21
Stock based compensation expense | $ | $ 20.5 | $ 28.9 | $ 25.5
Unrecognized compensation expense related to options | $ | $ 23.8 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 1 month |  |
Minimum [Member] |  |  |
Additional information - stock options |  |  |
Vesting period | 2 years |  | 3 years
Maximum [Member] |  |  |
Additional information - stock options |  |  |
Vesting period | 9 years 9 months |  | 5 years

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition Number of options outstanding, including both vested and non-vested options. + 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=6415400&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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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