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Income Taxes - Deferred Tax Assets and Liabilites (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014
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Income Tax Disclosure [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | $ 3.2 | $ 2.8
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 2.7 | 2.7
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 2.3 | 2.1
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 2.3 | 2.3
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 4.3 | 5.1
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 8.6 | 14.4
Deferred Tax Assets, Intangible Assets | 4.6 | 5.3
Deferred Tax Assets, Equity Method Investments | 0.2 | 0.6
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 2.4 | 0.8
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 1.0 | 0.5
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 1.9 | 1.9
Deferred Tax Assets, Other | 1.3 | 1.5
Deferred Tax Assets, Gross | 34.8 | 40.0
Deferred Tax Assets, Valuation Allowance | (3.2) | (2.8)
Deferred Tax Assets, Net of Valuation Allowance | 31.6 | 37.2
Deferred Tax Liabilities, Unrealized Gains on Trading Securities | 1.0 | 1.3
Deferred Tax Liabilities, Prepaid Expenses | 1.1 | 1.2
Deferred Tax Liabilities, Property, Plant and Equipment | 1.3 | 2.7
Deferred Tax Liabilities, Gross | 3.4 | 5.2
Deferred tax assets, Net | $ 28.2 | $ 32.0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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