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Employee Benefit Plans - Stock Options (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Stock Options |  |  |
Outstanding at beginning of year, shares | 11,395,917 | 15,337,656 | 19,478,811
Exercised, shares | (2,770,569) | (3,504,989) | (3,636,655)
Canceled or expired, shares | (194,000) | (436,750) | (504,500)
Outstanding at end of year, shares | 8,431,348 | 11,395,917 | 15,337,656
Exercisable at end of year, shares | 5,772,214 | 6,645,967 | 6,859,889
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year, weighted average exercise price, per share | $ 16.69 | $ 17.50 | $ 17.37
Exercised, weighted average exercise price, per share | 15.83 | 20.02 | 16.49
Canceled or expired, weighted average exercise price, per share | 18.83 | 18.45 | 19.89
Outstanding at end of year, weighted average exercise price, per share | 16.92 | 16.69 | 17.50
Exercisable at end of year, weighted average exercise price, per share | $ 16.01 | $ 14.99 | $ 16.51
Additional information - stock options |  |  |
Expiration period | 10 years |  |
Total intrinsic value of options exercised | $ 49.5 | $ 39.2 | $ 44.6
Aggregate intrinsic value of options outstanding | 194.0 |  |
Aggregate intrinsic value of options exercisable | $ 138.0 |  |
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 |  |
Weighted average remaining contractual term of options exercisable | 3 years 11 months |  |
Stock based compensation expense | $ 15.1 | $ 20.5 | $ 28.9
Unrecognized compensation expense related to options | $ 9.0 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 4 months |  |
Minimum [Member] |  |  |
Additional information - stock options |  |  |
Vesting period | 2 years |  |
Maximum [Member] |  |  |
Additional information - stock options |  |  |
Vesting period | 9 years 9 months |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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