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Investment In and Advances to Unconsolidated Affiliates - Equity in Income of MVG (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Equity in income of unconsolidated investments $ 29.6 $ 25.5 $ 17.4
Miami Valley Gaming LLC      
Schedule of Equity Method Investments [Line Items]      
Equity in income of unconsolidated investments $ 19.9 $ 16.7 $ 14.2