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Income Taxes - Deferred Tax Assets and Liabilites (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research | $ 0.4 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 3.7 | $ 4.3
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 0.1 | 1.9
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 2.0 | 2.0
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 5.6 | 2.0
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 6.6 | 4.9
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 21.9 | 12.4
Deferred Tax Assets, Intangible Assets | 6.1 | 8.3
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 1.4 | 1.6
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 1.6 | 1.4
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 3.6 | 3.3
Deferred Tax Assets, Other | 1.9 | 1.8
Deferred Tax Assets, Gross | 54.5 | 43.9
Deferred Tax Assets, Valuation Allowance | (4.0) | (3.6)
Deferred Tax Assets, Net of Valuation Allowance | 50.5 | 40.3
Deferred Tax Liabilities, Unrealized Gains on Trading Securities | 3.2 | 1.3
Deferred Tax Liabilities, Prepaid Expenses | 2.5 | 1.9
Deferred Tax Liabilities, Property, Plant and Equipment | 2.2 | 2.6
Deferred Tax Liabilities, Gross | 7.9 | 5.8
Deferred tax assets, Net | $ 42.6 | $ 34.5

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