Stock-based Compensation Plans - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) performanceCondition performanceCriteria	Jun. 30, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation			$ 16.7	$ 14.4
Number of performance criteria | performanceCriteria			2
Performance Shares (PSUs) | Churchill Downs Incorporated 2007 Omnibus Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			3 years
Number of performance conditions | performanceCondition			2
Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 8.1	$ 7.4	$ 16.7	$ 14.4