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Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 09, 2019
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) $ 369.8 $ 369.8 $ 264.0    
Definite lived intangible assets 16.3 16.3 18.0    
Amortization of definite-lived intangible assets   15.0 6.0 $ 6.8  
Finite-lived intangible assets acquired   32.1 0.0 0.0  
Additional payments not included in future estimated amortization expense 2.3 2.3      
Other          
Finite-Lived Intangible Assets [Line Items]          
Definite lived intangible assets 7.2 7.2 7.2    
Total Churchill Downs          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets acquired   2.3 2.3    
Gaming rights          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 303.2 303.2 216.4    
Gaming rights | Online Wagering          
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      
Trademarks          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 50.2 50.2 29.5    
Illinois Horseracing Equity Trust | Churchill Downs          
Finite-Lived Intangible Assets [Line Items]          
Impairment of indefinite lived intangible assets       3.3  
Presque Isle | Gaming rights          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 56.0 56.0      
Presque Isle | Gaming rights | Online Wagering          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 10.0 10.0      
Presque Isle | Trademarks          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 15.2 15.2      
Turfway Park          
Finite-Lived Intangible Assets [Line Items]          
Amortization of definite-lived intangible assets 10.0        
Purchase and sale agreement rights         $ 10.0
Turfway Park | Gaming rights          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 9.8 9.8      
Turfway Park | Trademarks          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) $ 5.5 $ 5.5      
Ocean Downs | Other          
Finite-Lived Intangible Assets [Line Items]          
Definite lived intangible assets     2.3    
Ocean Downs | Gaming rights          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill)     87.0    
Ocean Downs | Trademarks          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill)     8.3    
Derby City Gaming | Other          
Finite-Lived Intangible Assets [Line Items]          
Definite lived intangible assets     $ 0.1    
Bluff Media | Online Wagering          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets (excluding goodwill)       4.7  
Bluff Media | Trademarks | Online Wagering          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets (excluding goodwill)       4.5  
Bluff Media | Customer Relationships | Online Wagering          
Finite-Lived Intangible Assets [Line Items]          
Impairment of definite lived intangible assets       $ 0.2