Investment In and Advances to Unconsolidated Affiliates - Equity in Income of MVG (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated investments	$ 25.5	$ 17.4	$ 11.2
Miami Valley Gaming LLC
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated investments	$ 16.7	$ 14.2	$ 10.6