| **Investments in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Investments in and Advances to Affiliates [Line Items]**                                                                  |           |           |   |   |   |   |   |   |
| Net revenue                                                                                                                 | $ 628.5        |           |   | $ 572.5 |   |   | $ 2,110.1 | $ 1,900.5 |
| Operating and SG&A expense                                                                                              | 59.8           |           |   | 50.2 |   |   | 172.0 | 150.6 |
| Operating income                                                                                                            | 125.9          |           |   | 112.3 |   |   | 582.2 | 457.8 |
| Net income attributable to Churchill Downs Incorporated                                                                     | 65.4           | $ 209.3        | $ 80.4 | 61.0 | $ 143.0 | $ 155.7 | 355.1 | 359.7 |
| Equity Method Investment, Nonconsolidated Investee or Group of Investees                                                    |           |           |   |   |   |   |   |   |
| **Investments in and Advances to Affiliates [Line Items]**                                                                  |           |           |   |   |   |   |   |   |
| Net revenue                                                                                                                 | 208.4          |           |   | 208.9 |   |   | 641.2 | 648.2 |
| Operating and SG&A expense                                                                                              | 132.2          |           |   | 135.1 |   |   | 399.3 | 407.3 |
| Depreciation and amortization                                                                                               | 6.8            |           |   | 5.9 |   |   | 20.1 | 17.5 |
| Total operating expense                                                                                                     | 139.0          |           |   | 141.0 |   |   | 419.4 | 424.8 |
| Operating income                                                                                                            | 69.4           |           |   | 67.9 |   |   | 221.8 | 223.4 |
| Interest and other, net                                                                                                     | (11.1)         |           |   | (11.1) |   |   | (33.5) | (32.7) |
| Net income attributable to Churchill Downs Incorporated                                                                     | $ 58.3         |           |   | $ 56.8 |   |   | $ 188.3 | $ 190.7 |

| X                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.
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| - Definition
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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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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The net result for the period of deducting operating expenses from operating revenues.
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.
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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.
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