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Acquisitions - Turfway Park (Details) - USD ($)
$ in Millions
Oct. 09, 2019
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Cash acquired in the acquisition       $ 13.1  
Goodwill acquired in the acquisition   $ 367.1 $ 338.0   $ 317.6
Turfway Park          
Business Acquisition [Line Items]          
Total consideration $ 46.0        
Consideration to be paid 36.0        
Purchase and sale agreement rights 10.0        
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 3.0        
Current liabilities acquired in the acquisition 2.6        
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