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Acquisitions - Ocean Downs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 31, 2018
Jul. 16, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 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   $ 0.0 $ 54.9 $ 0.0 $ 54.9    
Ocean Downs LLC and Racing Services LLC [Member]                
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