| **Acquisitions - Exacta Systems (Details) - USD ($) $ in Millions**         |         | 12 Months Ended |
|-----------------------------------------------------------------------------|---------|-----------------|
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| **Business Acquisition [Line Items]**                                       |    |            |   |   |
| Deferred payments for acquisition of business included in other liabilities |    | $ 4.9           | $ 0.0 | $ 0.0 |
| Goodwill                                                                    |    | 899.9           | 723.8 | 366.8 |
| Additions                                                                   |    | 177.1           | 357.0 |   |
| Operating Segments | Live and Historical Racing                             |    |            |   |   |
| **Business Acquisition [Line Items]**                                       |    |            |   |   |
| Goodwill                                                                    |    | 376.2           | 280.3 | 52.4 |
| Additions                                                                   |    | 95.9            | 227.9 |   |
| Operating Segments | TwinSpires                                             |    |            |   |   |
| **Business Acquisition [Line Items]**                                       |    |            |   |   |
| Goodwill                                                                    |    | 233.4           | 152.2 | $ 152.2 |
| Additions                                                                   |    | 81.2            | $ 0.0 |   |
| Exacta Systems                                                              |    |            |   |   |
| **Business Acquisition [Line Items]**                                       |    |            |   |   |
| Total consideration                                                         | $ 248.2 |            |   |   |
| Payments to acquire business                                                | 241.3   |            |   |   |
| Deferred payments for acquisition of business included in other liabilities | $ 6.9   |            |   |   |
| Payment term                                                                | 2 years |            |   |   |
| Cash acquired in the acquisition                                            | $ 1.8   |            |   |   |
| Property and equipment                                                      | 9.0     |            |   |   |
| Goodwill                                                                    | $ 177.1 | 177.1           |   |   |
| Exacta Systems | Operating Segments | Live and Historical Racing            |    |            |   |   |
| **Business Acquisition [Line Items]**                                       |    |            |   |   |
| Additions                                                                   |    | 95.9            |   |   |
| Exacta Systems | Operating Segments | TwinSpires                            |    |            |   |   |
| **Business Acquisition [Line Items]**                                       |    |            |   |   |
| Additions                                                                   |    | $ 81.2          |   |   |

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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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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.
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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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The amount of property, plant, and equipment recognized as of the acquisition date.
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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.
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