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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Valuation Allowance [Line Items] |  |  |
Gross deferred federal, state and local tax benefit | $ 6.5 |  |
Deferred federal, state and local tax benefit | 8.2 |  |
Deferred tax assets, tax deferred expense, employee compensation | (1.7) |  |
Change in valuation allowance | 6.6 |  |
Valuation allowance | 356.8 |  | $ 336.4
Federal and State |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred federal, state and local tax benefit | 9.5 |  |
Change in valuation allowance | 8.3 | $ 24.6 |
ASC 842 |  |  |
Valuation Allowance [Line Items] |  |  |
Change in valuation allowance | $ 13.8 |  |

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