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Acquisitions - Ocean Downs (Details) - USD ($)
$ in Millions
4 Months Ended 12 Months Ended
Aug. 31, 2018
Jul. 16, 2018
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 30, 2018
Jan. 01, 2017
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 $ 0.0 $ 54.9    
Repayments of assumed debt 54.7     0.0 0.0 54.7    
Goodwill     $ 338.0 $ 366.8 $ 367.1 $ 338.0    
Ocean Downs deferred tax liability $ 12.6              
Revenue since date of acquisition     $ 25.9          
Ocean Downs                
Business Acquisition [Line Items]                
Equity method investment, ownership percentage 100.00% 50.00%         50.00% 50.00%
Saratoga                
Business Acquisition [Line Items]                
Equity method investment, ownership percentage 25.00% 25.00%            
Ocean Downs LLC                
Business Acquisition [Line Items]                
Equity method investment, ownership percentage 62.50%              
Equity method investment, amount $ 80.5              
Saratoga New York And Saratoga Colorado                
Business Acquisition [Line Items]                
Equity method investment, ownership percentage 25.00%              
Equity method investment, amount $ 47.8              
Goodwill $ 20.4