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Acquisitions - Ocean Downs (Details) - USD ($)
$ in Millions
Aug. 31, 2018
Jul. 16, 2018
Aug. 30, 2018
Jan. 01, 2018
Business Acquisition [Line Items]        
Online real-money sports betting and iGaming agreement term   15 years    
Gain on Ocean Downs/Saratoga transaction $ 54.9      
Ocean Downs        
Business Acquisition [Line Items]        
Equity method investment, ownership percentage 100.00% 50.00%   50.00%
Saratoga New York And Saratoga Colorado        
Business Acquisition [Line Items]        
Equity method investment, ownership percentage   25.00% 25.00%  
Equity method investment, amount $ 47.8      
Ocean Downs LLC        
Business Acquisition [Line Items]        
Equity method investment, ownership percentage     62.50%  
Equity method investment, amount $ 80.5