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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |  |  |  |  |
Change in valuation allowance |  |  |  |  | $ 86.6 |
Deferred federal, state and local tax benefit | $ 15.4 | $ 91.3 |  | $ 71.3 | 123.0 |
Valuation allowance | 388.3 |  |  | 388.3 |  | $ 336.1
Formation of the Blackstone Venture |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Change in valuation allowance |  |  | $ 85.0 |  | 85.0 |
Adoption Of Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Change in valuation allowance |  |  |  |  | 48.5 |
Federal and State [Member] |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Change in valuation allowance | $ 2.7 | $ 59.6 |  | $ 52.2 | $ 86.6 |

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