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Asset Acquisitions Real Estate Disposition (Details) $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 02, 2016 USD ($) | May 23, 2013 USD ($) | Mar. 04, 2013 USD ($) | Dec. 31, 2013 USD ($) | May 21, 2013 a
Borgata Development [Member] [Member] |  |  |  |  |
Disposition of Echelon [Abstract] |  |  |  |  |
Sale of Dania Jai-Alai, price | $ 900.0 |  |  |  |
Proceeds from Divestiture of Businesses | $ 589.0 |  |  |  |
Dania Jai-Alai |  |  |  |  |
Disposition of Echelon [Abstract] |  |  |  |  |
Sale of Dania Jai-Alai, price |  | $ 65.5 |  |  |
Discontinued Operation, Intercompany Amounts with Discontinued Operation before Disposal Transaction, Revenue |  |  |  | $ 5.0 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  | $ 2.0 |
Proceeds from Divestiture of Businesses |  | 58.5 |  |  |
Area of land sold | a |  |  |  |  | 47
Disposition of Dania Jai Alai [Abstract] |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  | $ 18.9 |  |  |
Echelon Development [Member] |  |  |  |  |
Disposition of Echelon [Abstract] |  |  |  |  |
Sale of Dania Jai-Alai, price |  |  | $ 350.0 |  |
Proceeds from Divestiture of Businesses |  |  | $ 157.0 |  |
Area of land sold | a |  |  |  |  | 87

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