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Disposition (Real Estate Dispositions) (Details) $ in Millions	Aug. 02, 2016 USD ($)
Refund from Tax Settlement	$ 160.0
Proceeds from Divestiture of Businesses	900.0
Proceeds from Divestiture of Businesses, Net of Cash Divested	589.0
Borgata [Member]
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation	4.3
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	181.7
Refund from Tax Settlement	$ 140.0

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