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Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill)   $ 348.1 $ 350.6  
Definite lived intangible assets   12.1 14.6  
Amortization of definite-lived intangible assets   4.8 4.9 $ 15.0
Finite-lived intangible assets acquired   0.0 0.0 32.1
Additional payments not included in future estimated amortization expense   2.3    
Other        
Finite-Lived Intangible Assets [Line Items]        
Definite lived intangible assets   5.8 6.9  
Total Live and Historical Racing        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired     2.3 2.3
Trademarks        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill)   47.7 47.7  
Gaming rights        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill)   $ 288.2 $ 288.2  
Gaming rights | TwinSpires        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) $ 8.0     8.0
Gaming rights | Gaming        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) 3.0     3.0
Presque Isle | Trademarks        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) 15.2     15.2
Presque Isle | Gaming rights        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) 56.0     56.0
Presque Isle | Gaming rights | TwinSpires        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) 10.0     10.0
Turfway Park        
Finite-Lived Intangible Assets [Line Items]        
Amortization of definite-lived intangible assets 10.0      
Turfway Park | Trademarks        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) 5.5     5.5
Turfway Park | Gaming rights        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill) $ 9.8     $ 9.8