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Segment Information - Total Asset Information For Segments (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 3,216.0 |  | $ 2,551.0
Capital expenditures | 131.3 | $ 58.8 |
Operating Segments | Total Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,590.8 |  | 1,641.9
Capital expenditures | 38.8 | 55.0 |
Operating Segments | Churchill Downs |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 395.2 |  | 370.3
Capital expenditures | 28.2 | 21.9 |
Operating Segments | Online Wagering |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 250.1 |  | 241.5
Capital expenditures | 6.1 | 4.9 |
Operating Segments | Gaming |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 945.5 |  | 1,030.1
Capital expenditures | 4.5 | 28.2 |
Segment Reconciling Items | All Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,625.2 |  | $ 909.1
Capital expenditures | $ 92.5 | $ 3.8 |

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