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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | $ 628.5 | $ 572.5 | $ 2,110.1 | $ 1,900.5
Disclosure of complimentary revenue | 14.2 | 13.3 | 41.7 | 37.8
Related Party |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.0 | 0.0 | 0.0
Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 269.7 | 244.3 | 783.1 | 740.2
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.2 | 0.1 | 0.7
External Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 628.5 | 572.5 | 2,110.1 | 1,900.5
External Customer | Pari-mutuel, live and simulcast racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 102.9 | 107.4 | 374.6 | 370.3
External Customer | Pari-mutuel, historical racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 215.2 | 187.4 | 657.5 | 569.8
External Customer | Racing event-related services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 6.4 | 4.7 | 187.1 | 145.8
External Customer | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 231.8 | 211.4 | 669.4 | 634.5
External Customer | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 72.2 | 61.6 | 221.5 | 180.1
Operating Segments | External Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 628.5 | 572.3 | 2,110.0 | 1,899.8
Operating Segments | External Customer | Pari-mutuel, live and simulcast racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 102.9 | 107.4 | 374.6 | 370.3
Operating Segments | External Customer | Pari-mutuel, historical racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 215.2 | 187.4 | 657.5 | 569.8
Operating Segments | External Customer | Racing event-related services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 6.4 | 4.7 | 187.1 | 145.8
Operating Segments | External Customer | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 231.8 | 211.4 | 669.4 | 634.5
Operating Segments | External Customer | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 72.2 | 61.4 | 221.4 | 179.4
Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 247.5 | 219.5 | 957.3 | 818.9
Operating Segments | Live and Historical | Related Party |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 4.9 | 6.0 | 34.2 | 30.4
Operating Segments | Live and Historical | External Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 247.5 | 219.5 | 957.3 | 818.9
Operating Segments | Live and Historical | External Customer | Pari-mutuel, live and simulcast racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 15.2 | 16.0 | 76.6 | 67.2
Operating Segments | Live and Historical | External Customer | Pari-mutuel, historical racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 205.9 | 179.9 | 630.1 | 549.3
Operating Segments | Live and Historical | External Customer | Racing event-related services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 5.0 | 3.3 | 182.1 | 141.0
Operating Segments | Live and Historical | External Customer | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 3.1 | 3.1 | 9.5 | 8.2
Operating Segments | Live and Historical | External Customer | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 18.3 | 17.2 | 59.0 | 53.2
Operating Segments | TwinSpires |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 111.3 | 108.5 | 369.6 | 340.7
Operating Segments | TwinSpires | Related Party |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 7.4 | 3.9 | 23.1 | 7.1
Operating Segments | TwinSpires | External Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 111.3 | 108.5 | 369.6 | 340.7
Operating Segments | TwinSpires | External Customer | Pari-mutuel, live and simulcast racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 82.7 | 86.3 | 277.9 | 283.2
Operating Segments | TwinSpires | External Customer | Pari-mutuel, historical racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.0 | 0.0 | 0.0
Operating Segments | TwinSpires | External Customer | Racing event-related services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.0 | 0.0 | 0.0
Operating Segments | TwinSpires | External Customer | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 4.4 | 5.3 | 14.4 | 10.9
Operating Segments | TwinSpires | External Customer | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 24.2 | 16.9 | 77.3 | 46.6
Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 269.7 | 244.3 | 783.1 | 740.2
Operating Segments | Gaming | Related Party |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.6 | 0.6 | 4.8 | 4.2
Operating Segments | Gaming | External Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 269.7 | 244.3 | 783.1 | 740.2
Operating Segments | Gaming | External Customer | Pari-mutuel, live and simulcast racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 5.0 | 5.1 | 20.1 | 19.9
Operating Segments | Gaming | External Customer | Pari-mutuel, historical racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 9.3 | 7.5 | 27.4 | 20.5
Operating Segments | Gaming | External Customer | Racing event-related services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 1.4 | 1.4 | 5.0 | 4.8
Operating Segments | Gaming | External Customer | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 224.3 | 203.0 | 645.5 | 615.4
Operating Segments | Gaming | External Customer | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 29.7 | 27.3 | 85.1 | 79.6
All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.2 | 0.1 | 0.7
All Other | Related Party |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 2.6 | 0.0 | 4.4 | 0.0
All Other | External Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.2 | 0.1 | 0.7
All Other | External Customer | Pari-mutuel, live and simulcast racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.0 | 0.0 | 0.0
All Other | External Customer | Pari-mutuel, historical racing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 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 | 0.0
All Other | External Customer | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.0 | 0.0 | 0.0
All Other | External Customer | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0.0 | 0.2 | 0.1 | 0.7
Eliminations | Related Party |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | (15.5) | (10.5) | (66.5) | (41.7)
Churchill Downs Racetrack | Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 11.7 | 10.6 | 242.8 | 191.3
Louisville | Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 50.3 | 48.9 | 157.1 | 138.2
Northern Kentucky | Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 23.4 | 19.5 | 73.9 | 63.1
Southwestern Kentucky | Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 39.3 | 37.6 | 118.1 | 111.7
Western Kentucky | Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 9.8 | 11.6 | 22.7 | 25.8
Virginia | Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 110.0 | 88.1 | 333.1 | 280.4
New Hampshire | Operating Segments | Live and Historical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 3.0 | 3.2 | 9.6 | 8.4
Florida | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 23.8 | 24.4 | 76.4 | 76.5
Iowa | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 22.9 | 24.0 | 69.8 | 72.5
Indiana | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 32.4 | 0.0 | 66.3 | 0.0
Louisiana | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 32.0 | 32.2 | 113.4 | 110.1
Maine | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 27.7 | 30.9 | 81.3 | 88.1
Maryland | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 31.5 | 32.0 | 79.3 | 82.9
Mississippi | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 23.6 | 24.2 | 74.1 | 77.5
New York | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 46.8 | 46.2 | 138.3 | 135.3
Pennsylvania | Operating Segments | Gaming |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | $ 29.0 | $ 30.4 | $ 84.2 | $ 97.3

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