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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |  |  |  |  |
Change in valuation allowance |  |  |  |  | $ 27.0 |
Deferred federal, state and local tax benefit | $ 46.4 | $ 18.2 |  | $ 55.9 | 31.7 |
Valuation allowance | 391.0 |  |  | 391.0 |  | $ 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 | $ 30.3 | $ 15.2 |  | $ 54.9 | $ 27.0 |

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