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Segment Information - Total Asset Information For Segments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 2,478.5 |  | $ 1,725.2
Capital expenditures | 28.1 | $ 34.0 |
Operating Segments | Total Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 2,208.9 |  | 1,459.5
Capital expenditures | 23.6 | 32.5 |
Operating Segments | Churchill Downs |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 367.7 |  | 359.6
Capital expenditures | 9.6 | 26.2 |
Operating Segments | Online Wagering |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 237.4 |  | 222.8
Capital expenditures | 11.5 | 2.3 |
Operating Segments | Gaming |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,603.8 |  | 877.1
Capital expenditures | 2.5 | 4.0 |
Segment Reconciling Items | All Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 269.6 |  | $ 265.7
Capital expenditures | $ 4.5 | $ 1.5 |

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