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Segment Information - Schedule of Net Revenue from External Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net revenue from external customers $ 515.1 $ 185.1 $ 839.4 $ 438.0
Revenue from Related Parties 0.0 0.0 0.0 0.0
Disclosure of complimentary revenue 5.2 0.8 8.9 8.4
Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 190.5 30.3 255.2 59.4
TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 135.9 121.7 236.0 191.1
Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 186.0 37.3 340.0 184.7
Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue from external customers 515.1 185.1 839.4 438.0
Operating Segments | Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 175.9 23.3 239.1 51.4
Revenue from Related Parties 14.6 7.0 16.1 8.0
Operating Segments | Live and Historical Racing | Churchill Downs Racetrack        
Segment Reporting Information [Line Items]        
Net revenue from external customers 105.2 15.6 107.2 17.5
Operating Segments | Live and Historical Racing | Derby City Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 39.9 7.7 72.8 29.3
Operating Segments | Live and Historical Racing | Oak Grove        
Segment Reporting Information [Line Items]        
Net revenue from external customers 25.6 0.0 45.0  
Operating Segments | Live and Historical Racing | Turfway Park        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.7 0.0 5.1 4.6
Operating Segments | Live and Historical Racing | Newport        
Segment Reporting Information [Line Items]        
Net revenue from external customers 4.5 0.0 9.0  
Operating Segments | TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 135.6 121.3 235.3 190.4
Revenue from Related Parties 0.3 0.4 0.7 0.7
Operating Segments | TwinSpires | Horse Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 127.2 119.9 219.9 186.5
Operating Segments | TwinSpires | Sports and Casino        
Segment Reporting Information [Line Items]        
Net revenue from external customers 8.4 1.4 15.4 3.9
Operating Segments | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 186.0 37.3 338.0 183.2
Revenue from Related Parties 0.0 0.0 2.0 1.5
Operating Segments | Gaming | Fair Grounds and VSI        
Segment Reporting Information [Line Items]        
Net revenue from external customers 35.1 11.1 73.4 42.7
Operating Segments | Gaming | Presque Isle        
Segment Reporting Information [Line Items]        
Net revenue from external customers 30.5 1.9 54.3 28.9
Operating Segments | Gaming | Calder        
Segment Reporting Information [Line Items]        
Net revenue from external customers 27.4 5.7 48.3 27.5
Operating Segments | Gaming | Oxford        
Segment Reporting Information [Line Items]        
Net revenue from external customers 24.6 0.1 40.3 20.2
Operating Segments | Gaming | Ocean Downs        
Segment Reporting Information [Line Items]        
Net revenue from external customers 27.0 3.1 47.0 17.9
Operating Segments | Gaming | Riverwalk        
Segment Reporting Information [Line Items]        
Net revenue from external customers 18.4 7.4 32.8 19.4
Operating Segments | Gaming | Harlow’s        
Segment Reporting Information [Line Items]        
Net revenue from external customers 16.6 5.7 30.6 17.0
Operating Segments | Gaming | Lady Luck Nemacolin        
Segment Reporting Information [Line Items]        
Net revenue from external customers 6.4 2.3 11.3 9.6
All Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 17.6 3.2 27.0 13.0
Revenue from Related Parties 3.9 2.8 6.6 5.2
Eliminations        
Segment Reporting Information [Line Items]        
Revenue from Related Parties (18.8) (10.2) (25.4) (15.4)
Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 186.0 37.3 338.0 183.2
Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 17.6 3.2 27.0 13.0
External Customer        
Segment Reporting Information [Line Items]        
Net revenue from external customers 515.1 185.1 839.4 438.0
External Customer | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue from external customers 497.5 181.9 812.4 425.0
External Customer | Operating Segments | Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 175.9 23.3 239.1 51.4
External Customer | Operating Segments | TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 135.6 121.3 235.3 190.4
External Customer | Operating Segments | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 186.0 37.3 338.0 183.2
External Customer | All Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 17.6 3.2 27.0 13.0
External Customer | Pari-mutuel, live and simulcast racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 175.1 133.0 287.0 217.7
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue from external customers 165.6 132.2 272.4 211.2
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 39.6 14.9 45.5 20.1
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 121.6 115.6 210.8 179.5
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 4.4 1.7 16.1 11.6
External Customer | Pari-mutuel, live and simulcast racing | All Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 9.5 0.8 14.6 6.5
External Customer | Pari-mutuel, historical racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 64.9 7.3 117.8 27.7
External Customer | Pari-mutuel, historical racing | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue from external customers 64.9 7.3 117.8 27.7
External Customer | Pari-mutuel, historical racing | Operating Segments | Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 64.9 7.3 117.8 27.7
External Customer | Pari-mutuel, historical racing | Operating Segments | TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.0 0.0 0.0 0.0
External Customer | Pari-mutuel, historical racing | Operating Segments | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.0 0.0 0.0 0.0
External Customer | Pari-mutuel, historical racing | All Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.0 0.0 0.0 0.0
External Customer | Racing event-related services        
Segment Reporting Information [Line Items]        
Net revenue from external customers 65.6 1.2 66.3 2.6
External Customer | Racing event-related services | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue from external customers 63.7 1.2 64.4 2.5
External Customer | Racing event-related services | Operating Segments | Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 63.5 0.5 63.5 0.5
External Customer | Racing event-related services | Operating Segments | TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.0 0.0 0.0 0.0
External Customer | Racing event-related services | Operating Segments | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.2 0.7 0.9 2.0
External Customer | Racing event-related services | All Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 1.9 0.0 1.9 0.1
External Customer | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 178.6 34.8 318.1 157.1
External Customer | Gaming | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue from external customers 178.6 34.8 318.1 157.1
External Customer | Gaming | Operating Segments | Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.0 0.0 0.0 0.0
External Customer | Gaming | Operating Segments | TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 8.4 1.4 15.4 3.9
External Customer | Gaming | Operating Segments | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 170.2 33.4 302.7 153.2
External Customer | Gaming | All Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 0.0 0.0 0.0 0.0
External Customer | Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers 30.9 8.8 50.2 32.9
External Customer | Other | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue from external customers 24.7 6.4 39.7 26.5
External Customer | Other | Operating Segments | Live and Historical Racing        
Segment Reporting Information [Line Items]        
Net revenue from external customers 7.9 0.6 12.3 3.1
External Customer | Other | Operating Segments | TwinSpires        
Segment Reporting Information [Line Items]        
Net revenue from external customers 5.6 4.3 9.1 7.0
External Customer | Other | Operating Segments | Gaming        
Segment Reporting Information [Line Items]        
Net revenue from external customers 11.2 1.5 18.3 16.4
External Customer | Other | All Other        
Segment Reporting Information [Line Items]        
Net revenue from external customers $ 6.2 $ 2.4 $ 10.5 $ 6.4