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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |  |
Total assets | $ 2,551.0 | $ 1,725.2 |
Total liabilities | 2,040.0 | 1,251.9 |
Advertising and marketing expense | 41.8 | 28.8 | $ 24.8
Oak Grove |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 62.1 |  |
Total liabilities | $ 9.3 |  |
Grandstands and buildings | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Grandstands and buildings | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 40 years |  |
Equipment | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 2 years |  |
Equipment | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Furniture and fixtures | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 2 years |  |
Furniture and fixtures | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Tracks and other improvements | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Tracks and other improvements | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 20 years |  |
Internally developed and purchased third party software |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software developed or acquired for internal use | $ 9.8 | 9.7 | 7.2
Capitalized computer software developed or acquired for internal use, amortization expense | $ 8.8 | $ 7.3 | $ 6.3
Internally developed and purchased third party software | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 3 years |  |
WKY Development, LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership percentage | 95.00% |  |

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