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Segment Information - Summary of Capital Expenditures (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | $ 12.3 | $ 48.3
Operating Segments | Total Segments |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 11.7 | 46.5
Operating Segments | Live and Historical Racing |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 7.8 | 39.7
Operating Segments | TwinSpires |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 2.3 | 3.5
Operating Segments | Gaming |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 1.6 | 3.3
Segment Reconciling Items |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | $ 0.6 | $ 1.8

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