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Stock-Based Compensation Plans - Additional Information (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 24, 2016 | Oct. 31, 2018 performanceCondition executiveOfficer | Dec. 31, 2021 USD ($) service_period | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 | Oct. 29, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 27.8 | $ 23.7 | $ 23.8 |  |
Income tax benefit related to stock-based employee compensation |  |  | 1.5 | 1.9 | 2.1 |  |
Fair value of shares and units vested |  |  | $ 45.4 | $ 36.9 | $ 36.9 |  |
Award period |  |  | 1 year |  |  |  |
Churchill Downs Incorporated 2016 Omnibus Stock Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) | 1 year |  |  |  |  |  |
Churchill Downs Incorporated 2007 Omnibus Stock Incentive Plan | Restricted stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |  |  |
Churchill Downs Incorporated 2007 Omnibus Stock Incentive Plan | Restricted Stock Units (RSU) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |  |  |
Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | February 23, 2016 | Performance Share Units (PSU) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum award payout curve percentage of original performance share units awarded (as a percent) |  |  | 200.00% |  |  |  |
Percentage increase in awards if in top quartile |  |  | 25.00% |  |  |  |
Percentage decrease if in bottom quartile |  |  | 25.00% |  |  |  |
Maximum number of performance share units as percentage of original award (as a percent) |  |  | 250.00% |  |  |  |
7-Year Grant Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  | 7 years |  |  |  |  |
Performance and service period under adopted ELTI Plan |  | 3 years |  |  |  |  |
Number of named executives | executiveOfficer |  | 2 |  |  |  |  |
Number of performance criteria | performanceCondition |  | 2 |  |  |  |  |
7-Year Grant Plan | Restricted Stock Units (RSU) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |
Award vesting (as a percent) |  | 25.00% |  |  |  |  |
7-Year Grant Plan | Performance Share Units (PSU) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |
Performance and service period under adopted ELTI Plan |  | 3 years |  |  |  |  |
Maximum award payout curve percentage of original performance share units awarded (as a percent) |  | 200.00% |  |  |  |  | 200.00%
Award vesting (as a percent) |  | 25.00% |  |  |  |  |
Performance-Based Awards | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | February 23, 2016 | Performance Share Units (PSU) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance and service period under adopted ELTI Plan |  |  | 3 years | 3 years | 3 years | 3 years |
Requisite service periods | service_period |  |  | 3 |  |  |  |
Continuing Operations |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 27.8 | $ 23.7 | $ 23.8 |  |

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