| **Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions** | 6 Months Ended |         |
|------------------------------------------------------------------------------------------------------------------------------------|----------------|---------|
||
| **Segment Reporting, Asset Reconciling Item [Line Items]**                                                                         |           |    |   |
| Total assets                                                                                                                       | $ 6,578.6      |    | $ 6,206.8 |
| Capital expenditures                                                                                                               | 312.4          | $ 167.1 |   |
| Operating Segments                                                                                                                 |           |    |   |
| **Segment Reporting, Asset Reconciling Item [Line Items]**                                                                         |           |    |   |
| Total assets                                                                                                                       | 5,643.9        |    | 5,457.5 |
| Capital expenditures                                                                                                               | 308.6          | 166.2   |   |
| Operating Segments | Live and Historical                                                                                           |           |    |   |
| **Segment Reporting, Asset Reconciling Item [Line Items]**                                                                         |           |    |   |
| Total assets                                                                                                                       | 3,552.8        |    | 3,345.4 |
| Capital expenditures                                                                                                               | 239.8          | 119.8   |   |
| Operating Segments | TwinSpires                                                                                                    |           |    |   |
| **Segment Reporting, Asset Reconciling Item [Line Items]**                                                                         |           |    |   |
| Total assets                                                                                                                       | 288.3          |    | 287.9 |
| Capital expenditures                                                                                                               | 6.4            | 6.0     |   |
| Operating Segments | Gaming                                                                                                        |           |    |   |
| **Segment Reporting, Asset Reconciling Item [Line Items]**                                                                         |           |    |   |
| Total assets                                                                                                                       | 1,802.8        |    | 1,824.2 |
| Capital expenditures                                                                                                               | 62.4           | 40.4    |   |
| All Other                                                                                                                          |           |    |   |
| **Segment Reporting, Asset Reconciling Item [Line Items]**                                                                         |           |    |   |
| Total assets                                                                                                                       | 934.7          |    | $ 749.3 |
| Capital expenditures                                                                                                               | $ 3.8          | $ 0.9   |   |

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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
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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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No definition available.
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