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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 30, 2018
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 $ 0.0  
Cash acquired in the acquisition   $ 13.1              
Repayments of assumed debt $ 54.7         54.7 0.0 $ 0.0  
Goodwill           20.4 16.1    
Ocean Downs deferred tax liability   $ 12.6              
Revenue since date of acquisition         $ 25.9        
Ocean Downs and Racing Services                  
Business Acquisition [Line Items]                  
Equity method investment, ownership percentage   100.00% 50.00%            
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              
Casino                  
Business Acquisition [Line Items]                  
Goodwill   $ 20.4       $ 20.4 $ 0.0