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Net Income Per Common Share Computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Numerator for basic and diluted net income per common share:                  
Net income attributable to Churchill Downs Incorporated $ 38.1 $ 216.9 $ 76.7 $ 65.4 $ 209.3 $ 80.4 $ 331.7 $ 355.1  
Adjustments related to redeemable noncontrolling interests (0.2)     (1.0)     (1.8) (1.8) $ (3.0)
Net income attributable to common shareholders $ 37.9     $ 64.4     $ 329.9 $ 353.3  
Denominator for net income per common share:                  
Basic (in shares) 70,300     73,900     71,900 74,000  
Plus dilutive effect of stock awards (in shares) 700     700     600 600  
Diluted (in shares) 71,000     74,600     72,500 74,600  
Basic                  
Basic net income (in dollars per share) $ 0.54     $ 0.87     $ 4.59 $ 4.78  
Diluted                  
Diluted net income (in dollars per share) $ 0.54     $ 0.86     $ 4.55 $ 4.73