Net Income Per Common Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator for basic and diluted net income per common share:
Net income and comprehensive income attributable to Churchill Downs Incorporated	$ 216.9	$ 76.7	$ 209.3	$ 80.4	$ 293.6	$ 289.7
Adjustments related to redeemable noncontrolling interest	(0.4)		(0.8)		(1.6)	(0.8)
Net income attributable to common shareholders	$ 216.5		$ 208.5		$ 292.0	$ 288.9
Denominator for net income per common share:
Basic (in shares)	71,700		73,900		72,700	74,000
Plus dilutive effect of stock awards (in shares)	600		700		600	600
Diluted (in shares)	72,300		74,600		73,300	74,600
Basic
Basic net income (in dollars per share)	$ 3.02		$ 2.82		$ 4.02	$ 3.90
Diluted
Diluted net income (in dollars per share)	$ 2.99		$ 2.79		$ 3.98	$ 3.87