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Acquisitions - Ocean Downs (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Sep. 04, 2018
Aug. 31, 2018
Jul. 16, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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   $ 54.9   $ 0.0 $ 54.9 $ 0.0    
Repayments of assumed debt $ 54.7         0.0 54.7 0.0    
Goodwill         $ 338.0 $ 367.1 $ 338.0 $ 317.6    
Ocean Downs deferred tax liability   $ 12.6                
Revenue since date of acquisition         $ 25.9          
Saratoga                    
Business Acquisition [Line Items]                    
Equity method investment, ownership percentage   25.00% 25.00%              
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                
Ocean Downs                    
Business Acquisition [Line Items]                    
Equity method investment, ownership percentage   100.00% 50.00%           50.00% 50.00%
Ocean Downs LLC                    
Business Acquisition [Line Items]                    
Equity method investment, ownership percentage   62.50%                
Equity method investment, amount   $ 80.5