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Stock-based Compensation Plans Schedule of shared-based compensation, performance units (Details) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2013 Performance Shares [Member] Share-based Compensation Award, Tranche Three [Member] | Dec. 31, 2012 Performance Shares [Member] Share-based Compensation Award, Tranche Three [Member] | Dec. 31, 2013 Performance Shares [Member] Share-based Compensation Award, Tranche Two [Member] | Dec. 31, 2012 Performance Shares [Member] Share-based Compensation Award, Tranche Two [Member] | Sep. 30, 2014 Performance Shares [Member] Share-based Compensation Award, Tranche Two [Member] | Dec. 31, 2013 Performance Shares [Member] Share-based Compensation Award, Tranche One [Member] | Sep. 30, 2013 Performance Shares [Member] Share-based Compensation Award, Tranche One [Member] | Dec. 31, 2014 Scenario, Forecast [Member] Performance Shares [Member] Share-based Compensation Award, Tranche Three [Member] | Sep. 30, 2016 Scenario, Forecast [Member] Performance Shares [Member] Share-based Compensation Award, Tranche Three [Member] | Dec. 31, 2014 Scenario, Forecast [Member] Performance Shares [Member] Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 381,012 | 509,338 | 1,406,318 | 90,849 | 135,552 | 90,841 | 135,553 |  | 90,841 | 135,553 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 1,099,591 | 995,037 | 867,451 |  |  |  |  | 271,106 | 181,682 | 271,106 | 0 | 0 | 0

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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