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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | $ 2,734.3 | $ 2,461.7 | $ 1,809.8
Other revenue | 56.0 | 50.9 | 33.9
Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.0 | 0.0 | 0.0
Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 1,039.1 | 968.6 | 755.9
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.1 | 0.9 | 2.9
External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 2,734.3 | 2,461.7 | 1,809.8
External Customer | Live and simulcast racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 469.9 | 468.2 | 462.3
External Customer | Historical racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 891.9 | 767.7 | 383.9
External Customer | Racing event-related services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 194.6 | 152.3 | 131.6
External Customer | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 885.9 | 832.2 | 679.1
External Customer | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 292.0 | 241.3 | 152.9
Operating Segments | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 2,734.2 | 2,460.8 | 1,806.9
Operating Segments | External Customer | Live and simulcast racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 469.9 | 468.2 | 462.3
Operating Segments | External Customer | Historical racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 891.9 | 767.7 | 383.9
Operating Segments | External Customer | Racing event-related services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 194.6 | 152.3 | 131.6
Operating Segments | External Customer | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 885.9 | 832.2 | 679.1
Operating Segments | External Customer | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 291.9 | 240.4 | 150.0
Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 1,225.6 | 1,047.3 | 614.6
Operating Segments | Live and Historical Racing | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 41.4 | 37.3 | 31.8
Operating Segments | Live and Historical Racing | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 1,225.6 | 1,047.3 | 614.6
Operating Segments | Live and Historical Racing | External Customer | Live and simulcast racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 91.3 | 81.9 | 66.8
Operating Segments | Live and Historical Racing | External Customer | Historical racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 854.9 | 739.1 | 374.1
Operating Segments | Live and Historical Racing | External Customer | Racing event-related services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 188.0 | 145.9 | 129.8
Operating Segments | Live and Historical Racing | External Customer | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 12.6 | 11.4 | 3.5
Operating Segments | Live and Historical Racing | External Customer | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 78.8 | 69.0 | 40.4
Operating Segments | Wagering Services and Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 469.5 | 444.9 | 436.4
Operating Segments | Wagering Services and Solutions | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 31.2 | 13.5 | 5.2
Operating Segments | Wagering Services and Solutions | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 469.5 | 444.9 | 436.4
Operating Segments | Wagering Services and Solutions | External Customer | Live and simulcast racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 352.2 | 359.7 | 367.4
Operating Segments | Wagering Services and Solutions | External Customer | Historical racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.0 | 0.0 | 0.0
Operating Segments | Wagering Services and Solutions | External Customer | Racing event-related services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.0 | 0.0 | 0.0
Operating Segments | Wagering Services and Solutions | External Customer | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 17.3 | 17.3 | 28.2
Operating Segments | Wagering Services and Solutions | External Customer | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 100.0 | 67.9 | 40.8
Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 1,039.1 | 968.6 | 755.9
Operating Segments | Gaming | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 6.3 | 6.0 | 5.9
Operating Segments | Gaming | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 1,039.1 | 968.6 | 755.9
Operating Segments | Gaming | External Customer | Live and simulcast racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 26.4 | 26.6 | 28.1
Operating Segments | Gaming | External Customer | Historical racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 37.0 | 28.6 | 9.8
Operating Segments | Gaming | External Customer | Racing event-related services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 6.6 | 6.4 | 1.8
Operating Segments | Gaming | External Customer | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 856.0 | 803.5 | 647.4
Operating Segments | Gaming | External Customer | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 113.1 | 103.5 | 68.8
All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.1 | 0.9 | 2.9
All Other | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 6.5 | 0.0 | 0.4
All Other | External Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.1 | 0.9 | 2.9
All Other | External Customer | Live and simulcast racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.0 | 0.0 | 0.0
All Other | External Customer | Historical racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.0 | 0.0 | 0.0
All Other | External Customer | Racing event-related services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.0 | 0.0 | 0.0
All Other | External Customer | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.0 | 0.0 | 0.0
All Other | External Customer | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 0.1 | 0.9 | 2.9
Eliminations | Related Party |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | (85.4) | (56.8) | (43.3)
Churchill Downs Racetrack | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 259.5 | 205.8 | 196.8
Louisville | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 209.1 | 189.0 | 169.9
Northern Kentucky | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 98.9 | 85.8 | 46.1
Southwestern Kentucky | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 158.3 | 147.8 | 131.4
Western Kentucky | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 28.8 | 31.8 | 4.5
Virginia | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 458.2 | 375.4 | 62.4
New Hampshire | Operating Segments | Live and Historical Racing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 12.8 | 11.7 | 3.5
Florida | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 100.2 | 100.7 | 106.2
Iowa | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 93.3 | 96.0 | 15.6
Indiana | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 96.6 | 0.0 | 0.0
Louisiana | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 150.2 | 145.6 | 140.8
Maine | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 106.0 | 114.1 | 114.4
Maryland | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 101.8 | 106.9 | 105.3
Mississippi | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 98.7 | 100.9 | 101.8
New York | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | 183.0 | 180.5 | 30.9
Pennsylvania | Operating Segments | Gaming |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net revenue | $ 109.3 | $ 123.9 | $ 140.9

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