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Revenue from Contracts with Customers - Net Revenue From External Customer and Intercompany Revenue From Each Operating Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | $ 1,809.8 | $ 1,597.2 | $ 1,054.0
Intercompany net revenues | 0.0 | 0.0 | 0.0
Other revenue | 33.9 | 20.9 | 13.1
External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 1,809.8 | 1,597.2 | 1,054.0
Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 462.3 | 502.6 | 475.1
Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 383.9 | 253.0 | 93.6
Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 131.6 | 76.7 | 24.7
Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 755.9 | 695.4 | 435.3
Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 679.1 | 656.8 | 392.6
All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 2.9 | 41.3 | 19.0
All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 152.9 | 108.1 | 68.0
Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 646.4 | 430.6 | 188.8
TwinSpires |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 441.6 | 457.8 | 435.6
Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 761.8 | 698.4 | 437.8
Operating Segments | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 1,806.9 | 1,555.9 | 1,035.0
Operating Segments | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 462.3 | 472.9 | 456.9
Operating Segments | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 383.9 | 253.0 | 93.6
Operating Segments | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 131.6 | 69.7 | 24.4
Operating Segments | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 679.1 | 656.8 | 392.6
Operating Segments | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 150.0 | 103.5 | 67.5
Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 614.6 | 409.1 | 169.6
Intercompany net revenues | 31.8 | 21.5 | 19.2
Operating Segments | Live and Historical Racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 614.6 | 409.1 | 169.6
Operating Segments | Live and Historical Racing | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 66.8 | 64.0 | 46.5
Operating Segments | Live and Historical Racing | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 374.1 | 253.0 | 93.6
Operating Segments | Live and Historical Racing | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 129.8 | 68.5 | 21.0
Operating Segments | Live and Historical Racing | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 3.5 | 0.0 | 0.0
Operating Segments | Live and Historical Racing | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 40.4 | 23.6 | 8.5
Operating Segments | TwinSpires |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 436.4 | 451.4 | 430.1
Intercompany net revenues | 5.2 | 6.4 | 5.5
Operating Segments | TwinSpires | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 436.4 | 451.4 | 430.1
Operating Segments | TwinSpires | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 367.4 | 380.7 | 387.5
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 | 28.2 | 34.8 | 11.3
Operating Segments | TwinSpires | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 40.8 | 35.9 | 31.3
Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Intercompany net revenues | 5.9 | 3.0 | 2.5
Operating Segments | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 755.9 | 695.4 | 435.3
Operating Segments | Gaming | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 28.1 | 28.2 | 22.9
Operating Segments | Gaming | Historical racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 9.8 | 0.0 | 0.0
Operating Segments | Gaming | Racing event-related services | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 1.8 | 1.2 | 3.4
Operating Segments | Gaming | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 647.4 | 622.0 | 381.3
Operating Segments | Gaming | All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 68.8 | 44.0 | 27.7
All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 2.9 | 41.3 | 19.0
Intercompany net revenues | 0.4 | 7.9 | 7.8
All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 2.9 | 41.3 | 19.0
All Other | Live and simulcast racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 0.0 | 29.7 | 18.2
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 | 7.0 | 0.3
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 | 2.9 | 4.6 | 0.5
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Intercompany net revenues | (43.3) | (38.8) | (35.0)
Churchill Downs Racetrack | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 196.8 | 128.1 | 63.3
Churchill Downs Racetrack | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 755.9 | 695.4 | 435.3
Louisville | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 169.9 | 154.3 | 79.5
Northern Kentucky | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 46.1 | 26.0 | 10.2
Southwestern Kentucky | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 131.4 | 100.7 | 16.6
Western Kentucky | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 4.5 | 0.0 | 0.0
Virginia | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 62.4 | 0.0 | 0.0
New Hampshire | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 3.5 | 0.0 | 0.0
Florida | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 106.2 | 100.0 | 51.8
Iowa | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 15.6 | 0.0 | 0.0
Louisiana | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 140.8 | 133.6 | 97.6
Maine | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 114.4 | 99.8 | 44.9
Maryland | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 105.3 | 100.6 | 60.2
Mississippi | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 101.8 | 117.3 | 87.0
New York | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | 30.9 | 0.0 | 0.0
Pennsylvania | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total net revenue | $ 140.9 | $ 144.1 | $ 93.8

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