Net Income Per Common Share Computations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator for basic and diluted net income per common share:
Net income attributable to Churchill Downs Incorporated	$ 426.8	$ 417.3	$ 439.4
Redemption value adjustment	3.0	0.0	0.0
Net income attributable to common shareholders	$ 423.8	$ 417.3	$ 439.4
Denominator for net income per common share:
Basic (in shares)	74.0	75.2	75.9
Plus dilutive effect of stock awards (in shares)	0.6	0.9	1.1
Diluted (in shares)	74.6	76.1	77.0
Basic
Basic net income (in dollars per share)	$ 5.73	$ 5.55	$ 5.79
Diluted
Diluted net income (in dollars per share)	$ 5.68	$ 5.49	$ 5.71