| **Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions** | 12 Months Ended |
|-----------------------------------------------------------------------|-----------------|
||
| **Goodwill [Roll Forward]**                                           |            |   |
| Balance, beginning of period                                          | $ 723.8         | $ 366.8 |
| Additions                                                             | 177.1           | 357.0 |
| Adjustments                                                           | (1.0)           |   |
| Balance, end of period                                                | 899.9           | 723.8 |
| All Other                                                             |            |   |
| **Goodwill [Roll Forward]**                                           |            |   |
| Balance, beginning of period                                          | 1.0             | 1.0 |
| Additions                                                             | 0.0             | 0.0 |
| Adjustments                                                           | (1.0)           |   |
| Balance, end of period                                                | 0.0             | 1.0 |
| Live and Historical | Operating Segments                              |            |   |
| **Goodwill [Roll Forward]**                                           |            |   |
| Balance, beginning of period                                          | 280.3           | 52.4 |
| Additions                                                             | 95.9            | 227.9 |
| Adjustments                                                           | 0.0             |   |
| Balance, end of period                                                | 376.2           | 280.3 |
| TwinSpires | Operating Segments                                       |            |   |
| **Goodwill [Roll Forward]**                                           |            |   |
| Balance, beginning of period                                          | 152.2           | 152.2 |
| Additions                                                             | 81.2            | 0.0 |
| Adjustments                                                           | 0.0             |   |
| Balance, end of period                                                | 233.4           | 152.2 |
| Gaming | Operating Segments                                           |            |   |
| **Goodwill [Roll Forward]**                                           |            |   |
| Balance, beginning of period                                          | 290.3           | 161.2 |
| Additions                                                             | 0.0             | 129.1 |
| Adjustments                                                           | 0.0             |   |
| Balance, end of period                                                | $ 290.3         | $ 290.3 |

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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
Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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