Stock-based Compensation Plans - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) performance_condition performance_criteria	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation			$ 18.2	$ 23.2
Number of performance criteria | performance_criteria			2
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liability classified awards	$ 9.0		$ 9.0		$ 25.0
PSUs | Churchill Downs Incorporated 2016 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 | performance_condition			2
Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 7.4	$ 7.1	$ 18.2	$ 23.2