Net Income Per Common Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator for basic and diluted net income per common share:
Net income and comprehensive income attributable to Churchill Downs Incorporated	$ 76.7	$ 80.4
Adjustments related to redeemable noncontrolling interest	1.2	0.0
Net income attributable to common shareholders	$ 75.5	$ 80.4
Denominator for net income per common share:
Basic (in shares)	73,700	74,100
Plus dilutive effect of stock awards (in shares)	700	600
Diluted (in shares)	74,400	74,700
Basic
Basic net income (in dollars per share)	$ 1.02	$ 1.09
Diluted
Diluted net income (in dollars per share)	$ 1.02	$ 1.08