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Segment Information - Summary of Capital Expenditures (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | $ 263.7 | $ 52.1
Operating Segments |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 249.7 | 50.1
Operating Segments | Live and Historical Racing: |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 177.4 | 32.3
Operating Segments | TwinSpires |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 9.3 | 8.5
Operating Segments | Gaming |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | 63.0 | 9.3
All Other |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Capital expenditures | $ 14.0 | $ 2.0

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