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Property and Equipment - Additional Information (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 08, 2016 USD ($) a | Nov. 04, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation expense |  |  | $ 55.7 | $ 53.6 | $ 55.0
Area of land sold | a | 61 |  |  |  |
Gain (loss) on sale of land |  |  | 23.7 | 0.0 | 0.0
Receivable from escrow | $ 14.0 |  | $ 13.6 | $ 0.0 |
TwinSpires |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Asset impairment charges |  | $ 3.2 |  |  |
Grandstands and buildings | Calder Barns |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Accelerated depreciation expense |  |  |  |  | $ 2.4
Land |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Proceeds from sale of land held-for-use | 25.6 |  |  |  |
Gain (loss) on sale of land | $ 23.7 |  |  |  |

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