| **Goodwill - Additional Information (Details) - USD ($) $ in Millions** | 12 Months Ended |         |         |         |        |
|-------------------------------------------------------------------------|-----------------|---------|---------|---------|--------|
||
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                | $ 899.9         | $ 723.8 |    |    |   | $ 366.8 |
| Additions                                                               | 177.1           | 357.0   |    |    |   |   |
| Gaming | Operating Segments                                             |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                | 290.3           | 290.3   |    |    |   | 161.2 |
| Additions                                                               | 0.0             | 129.1   |    |    |   |   |
| Live and Historical Racing | Operating Segments                         |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                | 376.2           | 280.3   |    |    |   | 52.4 |
| Additions                                                               | 95.9            | 227.9   |    |    |   |   |
| TwinSpires | Operating Segments                                         |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                | 233.4           | 152.2   |    |    |   | $ 152.2 |
| Additions                                                               | 81.2            | $ 0.0   |    |    |   |   |
| Ellis Park                                                              |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                |            |    |    |    | $ 9.2  |   |
| P2E Transaction                                                         |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                |            |    |    | $ 347.8 |   |   |
| P2E Transaction | Gaming                                                |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                |            |    |    | 129.1   |   |   |
| P2E Transaction | Live and Historical Racing                            |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                |            |    |    | $ 218.7 |   |   |
| Exacta Systems                                                          |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Goodwill                                                                | 177.1           |    | $ 177.1 |    |   |   |
| Exacta Systems | Live and Historical Racing | Operating Segments        |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Additions                                                               | 95.9            |    |    |    |   |   |
| Exacta Systems | TwinSpires | Operating Segments                        |            |    |    |    |   |   |
| **Indefinite-lived Intangible Assets [Line Items]**                     |            |    |    |    |   |   |
| Additions                                                               | $ 81.2          |    |    |    |   |   |

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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.
+ References
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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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