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Revenue from Contracts with Customers - Net Revenue From External Customers and Intercompany Revenue From Each Operating Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | $ 2,461.7 | $ 1,809.8 | $ 1,597.2
Other revenue | 50.9 | 33.9 | 20.9
External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 2,461.7 | 1,809.8 | 1,597.2
Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 468.2 | 462.3 | 502.6
Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 767.7 | 383.9 | 253.0
Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 152.3 | 131.6 | 76.7
Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 968.6 | 755.9 | 695.4
Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 832.2 | 679.1 | 656.8
All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.9 | 2.9 | 41.3
All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 241.3 | 152.9 | 108.1
Operating Segments | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 2,460.8 | 1,806.9 | 1,555.9
Operating Segments | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 468.2 | 462.3 | 472.9
Operating Segments | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 767.7 | 383.9 | 253.0
Operating Segments | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 152.3 | 131.6 | 69.7
Operating Segments | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 832.2 | 679.1 | 656.8
Operating Segments | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 240.4 | 150.0 | 103.5
Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 1,047.3 | 614.6 | 409.1
Operating Segments | Live and Historical Racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 1,047.3 | 614.6 | 409.1
Operating Segments | Live and Historical Racing | Churchill Downs Racetrack |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 205.8 | 196.8 | 128.1
Operating Segments | Live and Historical Racing | Louisville Property |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 189.0 | 169.9 | 154.3
Operating Segments | Live and Historical Racing | Northern Kentucky |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 85.8 | 46.1 | 26.0
Operating Segments | Live and Historical Racing | Southwestern Kentucky |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 147.8 | 131.4 | 100.7
Operating Segments | Live and Historical Racing | Western Kentucky |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 31.8 | 4.5 | 0.0
Operating Segments | Live and Historical Racing | Virginia |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 375.4 | 62.4 | 0.0
Operating Segments | Live and Historical Racing | New Hampshire |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 11.7 | 3.5 | 0.0
Operating Segments | Live and Historical Racing | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 37.3 | 31.8 | 21.5
Operating Segments | Live and Historical Racing | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 81.9 | 66.8 | 64.0
Operating Segments | Live and Historical Racing | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 739.1 | 374.1 | 253.0
Operating Segments | Live and Historical Racing | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 145.9 | 129.8 | 68.5
Operating Segments | Live and Historical Racing | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 11.4 | 3.5 | 0.0
Operating Segments | Live and Historical Racing | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 69.0 | 40.4 | 23.6
Operating Segments | TwinSpires |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 444.9 | 436.4 | 451.4
Operating Segments | TwinSpires | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 444.9 | 436.4 | 451.4
Operating Segments | TwinSpires | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 13.5 | 5.2 | 6.4
Operating Segments | TwinSpires | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 359.7 | 367.4 | 380.7
Operating Segments | TwinSpires | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
Operating Segments | TwinSpires | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
Operating Segments | TwinSpires | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 17.3 | 28.2 | 34.8
Operating Segments | TwinSpires | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 67.9 | 40.8 | 35.9
Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 968.6 | 755.9 | 695.4
Operating Segments | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 968.6 | 755.9 | 695.4
Operating Segments | Gaming | Florida |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 100.7 | 106.2 | 100.0
Operating Segments | Gaming | Iowa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 96.0 | 15.6 | 0.0
Operating Segments | Gaming | Louisiana |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 145.6 | 140.8 | 133.6
Operating Segments | Gaming | Maine |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 114.1 | 114.4 | 99.8
Operating Segments | Gaming | Maryland |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 106.9 | 105.3 | 100.6
Operating Segments | Gaming | Mississippi |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 100.9 | 101.8 | 117.3
Operating Segments | Gaming | New York |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 180.5 | 30.9 | 0.0
Operating Segments | Gaming | Pennsylvania |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 123.9 | 140.9 | 144.1
Operating Segments | Gaming | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 6.0 | 5.9 | 3.0
Operating Segments | Gaming | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 26.6 | 28.1 | 28.2
Operating Segments | Gaming | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 28.6 | 9.8 | 0.0
Operating Segments | Gaming | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 6.4 | 1.8 | 1.2
Operating Segments | Gaming | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 803.5 | 647.4 | 622.0
Operating Segments | Gaming | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 103.5 | 68.8 | 44.0
All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.9 | 2.9 | 41.3
All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.9 | 2.9 | 41.3
All Other | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.4 | 7.9
All Other | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 29.7
All Other | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
All Other | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 7.0
All Other | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
All Other | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.9 | 2.9 | 4.6
Eliminations | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | $ (56.8) | $ (43.3) | $ (38.8)

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