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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Valuation Allowance [Line Items] |  |  |  |  |
Change in valuation allowance | $ 15.2 | $ 3.0 | $ 27.0 | $ 17.2 |
Deferred federal, state and local tax benefit | 18.2 | $ 3.6 | 31.7 | $ 16.8 |
Valuation allowance | $ 424.9 |  | 424.9 |  | $ 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 |  |

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