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Income Taxes - Deferred Tax Assets and Liabilites (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | $ 4.2 | $ 5.6
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 6.5 | 0.0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 2.8 | 3.7
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 0.0 | 0.1
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 1.4 | 2.0
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 8.7 | 6.6
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 0.0 | 21.9
Deferred Tax Assets, Intangible Assets | 1.8 | 6.1
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 1.5 | 1.4
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 0.0 | 1.6
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 3.4 | 3.6
Deferred Tax Assets, Other | 0.9 | 1.9
Deferred Tax Assets, Gross | 31.2 | 54.5
Deferred Tax Assets, Valuation Allowance | (3.5) | (4.0)
Deferred Tax Assets, Net of Valuation Allowance | 27.7 | 50.5
Deferred Tax Liabilities, Unrealized Gains on Trading Securities | 2.6 | 3.2
Deferred Tax Liabilities, Prepaid Expenses | 1.8 | 2.5
Deferred Tax Liabilities, Property, Plant and Equipment | 3.1 | 2.2
Deferred Tax Liabilities, Pension Liability | 0.4 | 0.0
Deferred Tax Liabilities, Gross | 7.9 | 7.9
Deferred tax assets, Net | 19.8 | $ 42.6
SINGAPORE |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 2.9 |
UNITED STATES |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Liabilities, Pension Liability | 2.5 |
Tax Period [Domain] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 6.5 |

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