| **Segment Information - Reconciliation of Comprehensive Income to Adjusted EBITDA (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Net income (loss) and comprehensive income (loss) attributable to Churchill Downs Incorporated                        |           |            | $ 249.1 | $ (81.9) | $ 137.5 |
| Net loss attributable to noncontrolling interest                                                                      |           |            | 0.0 | 0.2 | 0.3 |
| Net income (loss)                                                                                                     |           |            | 249.1 | (82.1) | 137.2 |
| Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                                        |           |            | 0.0 | 95.4 | 2.4 |
| Income from continuing operations, net of tax                                                                         |           |            | 249.1 | 13.3 | 139.6 |
| Depreciation and amortization                                                                                         |           |            | 103.2 | 92.9 | 96.4 |
| Interest expense                                                                                                      |           |            | 84.7 | 80.0 | 70.9 |
| Income tax provision (benefit)                                                                                        |           |            | 94.5 | (5.3) | 56.8 |
| EBITDA                                                                                                                |           |            | 531.5 | 180.9 | 363.7 |
| Stock-based compensation expense                                                                                      |           |            | 27.8 | 23.7 | 23.8 |
| Legal reserves                                                                                                        |           |            | 0.0 | 0.0 | 3.6 |
| Other charges                                                                                                         |           |            | 0.2 | 0.8 | 0.4 |
| Pre-opening expense                                                                                                   |           |            | 5.8 | 11.2 | 5.1 |
| Interest, depreciation and amortization expense related to equity investments                                         |           |            | 41.5 | 38.5 | 32.6 |
| Changes in fair value of Rivers Des Plaines' interest rate swaps                                                      |           |            | (12.9) | 12.9 | 12.4 |
| Rivers Des Plaines' legal reserves and transactions costs                                                             |           |            | 9.9 | 0.0 | 4.7 |
| Other charges and recoveries, net                                                                                     |           |            | 0.0 | 0.0 | (0.2) |
| Transaction expense, net                                                                                              |           |            | 7.9 | 1.0 | 5.3 |
| Asset impairments                                                                                                     |           |            | 15.3 | 17.5 | 0.0 |
| Total adjustments to EBITDA                                                                                           |           |            | 95.5 | 105.6 | 87.7 |
| Adjusted EBITDA                                                                                                       |           |            | 627.0 | 286.5 | 451.4 |
| Operating Segments                                                                                                    |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | 664.9 | 325.1 | 482.8 |
| All Other                                                                                                             |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | (37.9) | (38.6) | (31.4) |
| Live and Historical Racing                                                                                            |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Asset impairments                                                                                                     |           | $ 11.2          |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | 175.0 | 39.1 | 135.6 |
| Live and Historical Racing | Operating Segments                                                                       |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | 175.0 | 39.1 | 135.6 |
| TwinSpires                                                                                                            |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Asset impairments                                                                                                     | $ 4.1          |            |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | 78.0 | 112.9 | 69.3 |
| TwinSpires | Operating Segments                                                                                       |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | 78.0 | 112.9 | 69.3 |
| Gaming Segment                                                                                                        |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | 411.9 | 173.1 | 277.9 |
| Gaming Segment | Operating Segments                                                                                   |           |            |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                        |           |            |   |   |   |
| Adjusted EBITDA                                                                                                       |           |            | $ 411.9 | $ 173.1 | $ 277.9 |

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.
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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.
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Amount after tax of income (loss) from continuing operations attributable to the parent.
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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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The net amount of operating interest income (expense).
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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.
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Amount of Net Income (Loss) attributable to noncontrolling interest.
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Amount of selling, general and administrative expense classified as other.
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Expenditures associated with opening new locations which are noncapital in nature and expensed as incurred.
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| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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| - Definition
Amount of recapitalization costs for professional fees associated with restructuring debt and equity mixture that do not qualify for capitalization.
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Amount of noncash expense for share-based payment arrangement.
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