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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Valuation Allowance [Line Items] |  |  |
Change in valuation allowance |  | $ 14.2 |
Deferred federal, state and local tax benefit |  | $ 13.2 |
Valuation allowance | $ 409.7 |  | $ 264.3
Formation of Blackstone Joint Venture [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Change in valuation allowance | 85.0 |  |
Adoption Of Accounting Standards Update 2016-09 [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Change in valuation allowance | 48.5 |  |
Allowance Against Current Operating Loss [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Change in valuation allowance | $ 11.8 |  |

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