| **Segment Information - Schedule of Net Revenue from External Customers (Details) - USD ($) $ in Millions**  | 3 Months Ended | 6 Months Ended |
|--------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | $ 582.5        | $ 515.1        | $ 946.6 | $ 839.4 |
| Intercompany net revenue                                                                                     | 0.0            | 0.0            | 0.0 | 0.0 |
| Disclosure of complimentary revenue                                                                          | 7.7            | 5.2            | 14.8 | 8.9 |
| Live and Historical Racing                                                                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 275.9          | 190.5          | 363.1 | 255.2 |
| TwinSpires                                                                                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 138.5          | 142.6          | 239.9 | 247.6 |
| Gaming                                                                                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 184.5          | 186.0          | 363.7 | 340.0 |
| Operating Segments                                                                                           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 582.5          | 515.1          | 946.6 | 839.4 |
| Operating Segments | Live and Historical Racing                                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 260.9          | 175.9          | 346.9 | 239.1 |
| Intercompany net revenue                                                                                     | 15.0           | 14.6           | 16.2 | 16.1 |
| Operating Segments | Live and Historical Racing | Churchill Downs Racetrack                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 174.2          | 105.2          | 176.2 | 107.2 |
| Operating Segments | Live and Historical Racing | Derby City Gaming                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 44.2           | 39.9           | 87.0 | 72.8 |
| Operating Segments | Live and Historical Racing | Oak Grove                                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 34.1           | 25.6           | 64.5 | 45.0 |
| Operating Segments | Live and Historical Racing | Turfway Park                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 1.0            | 0.7            | 5.5 | 5.2 |
| Operating Segments | Live and Historical Racing | Newport                                                    |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 7.4            | 4.5            | 13.7 | 8.9 |
| Operating Segments | TwinSpires                                                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 136.8          | 140.8          | 237.1 | 244.3 |
| Intercompany net revenue                                                                                     | 1.7            | 1.8            | 2.8 | 3.3 |
| Operating Segments | TwinSpires | Horse Racing                                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 130.6          | 132.4          | 220.6 | 228.9 |
| Operating Segments | TwinSpires | Sports and Casino                                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 6.2            | 8.4            | 16.5 | 15.4 |
| Operating Segments | Gaming                                                                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 184.3          | 186.0          | 361.6 | 338.0 |
| Intercompany net revenue                                                                                     | 0.2            | 0.0            | 2.1 | 2.0 |
| Operating Segments | Gaming | Fair Grounds and VSI                                                           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 37.2           | 35.1           | 78.7 | 73.4 |
| Operating Segments | Gaming | Presque Isle                                                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 30.3           | 30.5           | 57.5 | 54.3 |
| Operating Segments | Gaming | Ocean Downs                                                                    |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 27.4           | 27.0           | 48.7 | 47.0 |
| Operating Segments | Gaming | Calder                                                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 27.9           | 27.4           | 54.9 | 48.3 |
| Operating Segments | Gaming | Oxford                                                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 29.4           | 24.6           | 56.2 | 40.3 |
| Operating Segments | Gaming | Riverwalk                                                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 14.0           | 18.4           | 28.4 | 32.8 |
| Operating Segments | Gaming | Harlow’s                                                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 12.0           | 16.6           | 25.1 | 30.6 |
| Operating Segments | Gaming | Lady Luck Nemacolin                                                            |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 6.1            | 6.4            | 12.1 | 11.3 |
| All Other                                                                                                    |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.5            | 12.4           | 1.0 | 18.0 |
| Intercompany net revenue                                                                                     | 0.0            | 2.4            | 0.0 | 4.0 |
| Eliminations                                                                                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Intercompany net revenue                                                                                     | (16.9)         | (18.8)         | (21.1) | (25.4) |
| Gaming                                                                                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 184.3          | 186.0          | 361.6 | 338.0 |
| Other                                                                                                        |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.5            | 12.4           | 1.0 | 18.0 |
| External Customer                                                                                            |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 582.5          | 515.1          | 946.6 | 839.4 |
| External Customer | Operating Segments                                                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 582.0          | 502.7          | 945.6 | 821.4 |
| External Customer | Operating Segments | Live and Historical Racing                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 260.9          | 175.9          | 346.9 | 239.1 |
| External Customer | Operating Segments | TwinSpires                                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 136.8          | 140.8          | 237.1 | 244.3 |
| External Customer | Operating Segments | Gaming                                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 184.3          | 186.0          | 361.6 | 338.0 |
| External Customer | All Other                                                                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.5            | 12.4           | 1.0 | 18.0 |
| External Customer | Pari-mutuel, live and simulcast racing                                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 170.4          | 175.1          | 270.4 | 287.0 |
| External Customer | Pari-mutuel, live and simulcast racing | Operating Segments                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 170.4          | 165.6          | 270.4 | 272.4 |
| External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Live and Historical Racing |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 46.5           | 39.6           | 52.1 | 45.5 |
| External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | TwinSpires                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 118.4          | 121.6          | 199.9 | 210.8 |
| External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Gaming                     |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 5.5            | 4.4            | 18.4 | 16.1 |
| External Customer | Pari-mutuel, live and simulcast racing | All Other                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.0            | 9.5            | 0.0 | 14.6 |
| External Customer | Pari-mutuel, historical racing                                                           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 79.7           | 64.9           | 153.3 | 117.8 |
| External Customer | Pari-mutuel, historical racing | Operating Segments                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 79.7           | 64.9           | 153.3 | 117.8 |
| External Customer | Pari-mutuel, historical racing | Operating Segments | Live and Historical Racing         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 78.4           | 64.9           | 152.0 | 117.8 |
| External Customer | Pari-mutuel, historical racing | Operating Segments | TwinSpires                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.0            | 0.0            | 0.0 | 0.0 |
| External Customer | Pari-mutuel, historical racing | Operating Segments | Gaming                             |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 1.3            | 0.0            | 1.3 | 0.0 |
| External Customer | Pari-mutuel, historical racing | All Other                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.0            | 0.0            | 0.0 | 0.0 |
| External Customer | Racing event-related services                                                            |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 122.1          | 65.6           | 123.0 | 66.3 |
| External Customer | Racing event-related services | Operating Segments                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 122.1          | 63.7           | 123.0 | 64.4 |
| External Customer | Racing event-related services | Operating Segments | Live and Historical Racing          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 121.9          | 63.5           | 122.4 | 63.5 |
| External Customer | Racing event-related services | Operating Segments | TwinSpires                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.0            | 0.0            | 0.0 | 0.0 |
| External Customer | Racing event-related services | Operating Segments | Gaming                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.2            | 0.2            | 0.6 | 0.9 |
| External Customer | Racing event-related services | All Other                                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.0            | 1.9            | 0.0 | 1.9 |
| External Customer | Gaming                                                                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 164.3          | 178.6          | 325.5 | 318.1 |
| External Customer | Gaming | Operating Segments                                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 164.3          | 178.6          | 325.5 | 318.1 |
| External Customer | Gaming | Operating Segments | Live and Historical Racing                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.0            | 0.0            | 0.0 | 0.0 |
| External Customer | Gaming | Operating Segments | TwinSpires                                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 6.2            | 8.4            | 16.5 | 15.4 |
| External Customer | Gaming | Operating Segments | Gaming                                                     |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 158.1          | 170.2          | 309.0 | 302.7 |
| External Customer | Gaming | All Other                                                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 0.0            | 0.0            | 0.0 | 0.0 |
| External Customer | Other                                                                                    |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 46.0           | 30.9           | 74.4 | 50.2 |
| External Customer | Other | Operating Segments                                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 45.5           | 29.9           | 73.4 | 48.7 |
| External Customer | Other | Operating Segments | Live and Historical Racing                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 14.1           | 7.9            | 20.4 | 12.3 |
| External Customer | Other | Operating Segments | TwinSpires                                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 12.2           | 10.8           | 20.7 | 18.1 |
| External Customer | Other | Operating Segments | Gaming                                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | 19.2           | 11.2           | 32.3 | 18.3 |
| External Customer | Other | All Other                                                                        |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                               |           |           |   |   |
| Net revenue from external customers                                                                          | $ 0.5          | $ 1.0          | $ 1.0 | $ 1.5 |

| X                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of Complimentary Revenue
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.
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| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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