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Investment in and Advances to Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jan. 03, 2017
Dec. 31, 2016
Nov. 21, 2016
Aug. 31, 2016
Investments in and Advances to Affiliates [Line Items]                  
Other liabilities $ 1.2   $ 1.2   $ 0.1        
Distributed earnings from unconsolidated affiliates     $ 9.9 $ 8.7          
Old Bay Gaming and Racing LLC [Member]                  
Investments in and Advances to Affiliates [Line Items]                  
Equity Method Investment, Ownership Percentage                 50.00%
Miami Valley Gaming LLC [Member]                  
Investments in and Advances to Affiliates [Line Items]                  
Equity Method Investment, Ownership Percentage             50.00%    
Distributed earnings from unconsolidated affiliates $ 4.0 $ 4.0              
Saratoga Casino Black Hawk [Member]                  
Investments in and Advances to Affiliates [Line Items]                  
Equity Method Investment, Ownership Percentage               25.00%  
Ocean Downs LLC and Racing Services LLC [Member]                  
Investments in and Advances to Affiliates [Line Items]                  
Equity Method Investment, Effective Ownership Percentage           62.50%