| **Acquisitions - Turfway Park (Details) - USD ($) $ in Millions** | Oct. 09, 2019 | Mar. 31, 2020 | Dec. 31, 2019 |
|-------------------------------------------------------------------|---------------|---------------|---------------|
| **Business Acquisition [Line Items]**                             |          |          |          |
| Goodwill                                                          |          | $ 367.1       | $ 367.1       |
| Turfway Park                                                      |          |          |          |
| **Business Acquisition [Line Items]**                             |          |          |          |
| Total consideration                                               | $ 46.0        |          |          |
| Payments to acquire business                                      | 36.0          |          |          |
| Intangible asset acquired                                         | 10.0          |          |          |
| Working capital and other purchase price adjustments              | 0.9           |          |          |
| Cash acquired in the acquisition                                  | 0.6           |          |          |
| Land acquired                                                     | 18.8          |          |          |
| Goodwill                                                          | 3.0           |          |          |
| Current liabilities acquired                                      | 2.6           |          |          |
| Turfway Park | Game Rights                                        |          |          |          |
| **Business Acquisition [Line Items]**                             |          |          |          |
| Indefinite-lived assets acquired                                  | 9.8           |          |          |
| Turfway Park | Trademarks                                         |          |          |          |
| **Business Acquisition [Line Items]**                             |          |          |          |
| Indefinite-lived assets acquired                                  | $ 5.5         |          |          |

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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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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.
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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.
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Amount of real estate acquired, at 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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The current portion of nonphysical assets, excluding financial assets, if these assets are classified into the current and noncurrent portions.
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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
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