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Segment Information - Summary of Capital Expenditures (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | $ 55.5 | $ 12.3
Operating Segments |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 55.1 | 11.8
Operating Segments | Live and Historical Racing |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 44.5 | 7.8
Operating Segments | TwinSpires |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 3.1 | 2.4
Operating Segments | Gaming |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 7.5 | 1.6
All Other |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | $ 0.4 | $ 0.5

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