Stock-based Compensation Plans - Additional Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($) performanceCondition performanceCriteria	Mar. 31, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 8.6	$ 7.0
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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 8.6	$ 7.0

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Number Of Performance Criteria

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Amount of noncash expense for share-based payment arrangement.

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-Publisher FASB
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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