| **Acquisitions (Details) - USD ($) $ in Millions**                          |         | 9 Months Ended |        |
|-----------------------------------------------------------------------------|---------|----------------|--------|
||
| **Business Acquisition [Line Items]**                                       |    |           |   |   |
| Deferred payments for acquisition of business included in other liabilities |    | $ 1.2          | $ 6.9  |   |
| Goodwill                                                                    |    | 900.2          |   | $ 899.9 |
| Operating Segments | Live and Historical                                    |    |           |   |   |
| **Business Acquisition [Line Items]**                                       |    |           |   |   |
| Goodwill                                                                    |    | 376.3          |   | 376.2 |
| Operating Segments | TwinSpires                                             |    |           |   |   |
| **Business Acquisition [Line Items]**                                       |    |           |   |   |
| Goodwill                                                                    |    | 233.6          |   | $ 233.4 |
| Exacta Systems                                                              |    |           |   |   |
| **Business Acquisition [Line Items]**                                       |    |           |   |   |
| Total consideration                                                         | $ 248.2 |           |   |   |
| Cash payment                                                                | 241.3   |           |   |   |
| Deferred payments for acquisition of business included in other liabilities | $ 6.9   | 1.2            |   |   |
| Deferred payment term                                                       | 2 years |           |   |   |
| Goodwill                                                                    |    | 177.4          |   |   |
| Exacta Systems | Operating Segments | Live and Historical                   |    |           |   |   |
| **Business Acquisition [Line Items]**                                       |    |           |   |   |
| Goodwill additions                                                          |    | 96.0           |   |   |
| Exacta Systems | Operating Segments | TwinSpires                            |    |           |   |   |
| **Business Acquisition [Line Items]**                                       |    |           |   |   |
| Goodwill additions                                                          |    | $ 81.4         |   |   |

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Business Combination, Consideration Transferred, Deferred Payment Term
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| - Definition
Business Combination Expenditures Incurred But Not Yet Paid
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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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| - Definition
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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| - Definition
Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.
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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.
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| - Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
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