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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Deferred tax assets: |  |  |
Share-based compensation | $ 3.1 | $ 3.3 |
Deferred compensation | 4.1 | 3.6 |
Intangible assets | 9.9 | 4.8 |
Bad debt reserve | 4.4 | 1.3 |
Tax credit carryforwards | 0.2 | 0.5 |
Foreign tax credit carryforwards | 2.4 | 5.0 | $ 5.1
Other compensation | 5.8 | 2.2 |
Property and equipment | 7.3 | 0.0 |
Other | 1.9 | 1.1 |
Total gross deferred tax assets | 55.3 | 34.7 |
Less valuation allowance | (12.4) | (8.5) |
Deferred tax assets | 42.9 | 26.2 |
Deferred income tax liabilities: |  |  |
Unrealized gain on securities | 2.4 | 3.2 |
Prepaid expenses | 3.4 | 2.2 |
Property and equipment | 0.0 | 2.6 |
Pension liability | 0.2 | 0.2 |
Deferred income tax liabilities | 6.0 | 8.2 |
Deferred income taxes, net | 36.9 | 18.0 |
Non-US [Member] |  |  |
Deferred tax assets: |  |  |
Foreign net operating loss carryforwards | 5.4 | 2.6 |
United States [Member] |  |  |
Deferred tax assets: |  |  |
U.S. State and local net operating loss carryforwards | 9.0 | 9.2 |
U.S. federal net operating loss carryforwards | $ 1.8 | $ 1.1 |

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