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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Valuation Allowance [Line Items] |  |  |  |  |  |
Change in valuation allowance | $ 59.6 |  | $ 22.3 | $ 86.6 | $ 39.5 |
Deferred federal, state and local tax benefit | 91.3 |  | $ 18.9 | 123.0 | $ 37.5 |
Valuation allowance | $ 484.5 |  |  | 484.5 |  | $ 264.3
Formation of Blackstone Joint Venture [Member] |  |  |  |  |  |
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 |  |

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