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Acquisitions - Turfway Park (Details) - USD ($)
$ in Millions
Oct. 09, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2018
Business Acquisition [Line Items]          
Cash acquired in the acquisition         $ 13.1
Goodwill acquired in the acquisition   $ 366.8 $ 367.1 $ 338.0  
Turfway Park          
Business Acquisition [Line Items]          
Consideration to be paid $ 36.0        
Working capital and other purchase price adjustments 0.9        
Cash acquired in the acquisition 0.6        
Land acquired in the acquisition 18.8        
Goodwill acquired in the acquisition 2.7        
Current liabilities acquired in the acquisition 2.3        
Total consideration 46.0        
Purchase and sale agreement rights 10.0        
Turfway Park | Gaming rights          
Business Acquisition [Line Items]          
Indefinite-lived intangible assets acquired in the acquisition 9.8        
Turfway Park | Trademarks          
Business Acquisition [Line Items]          
Indefinite-lived intangible assets acquired in the acquisition $ 5.5