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Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 2,551.0 | $ 1,725.2 |
Capital expenditures | 131.2 | 149.4 | $ 109.0
Churchill Downs |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital expenditures | 31.4 | 109.6 | 54.1
Churchill Downs | Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 370.3 | 359.6 |
Online Wagering |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital expenditures | 9.7 | 9.7 | 9.0
Online Wagering | Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 241.5 | 222.8 |
Gaming |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,030.1 | 877.1 |
Capital expenditures | 37.1 | 20.7 | 39.7
Total Segments | Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 1,641.9 | 1,459.5 |
Capital expenditures | 78.2 | 140.0 | 102.8
All Other | All Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 909.1 | 265.7 |
Capital expenditures | $ 53.0 | $ 9.4 | $ 6.2

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