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Segment Information - Total Asset Information For Segments (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 1,696.6 |  | $ 2,359.4
Capital expenditures | 72.2 | $ 64.0 |
Racing Segment [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 496.4 |  | 483.0
Capital expenditures | 43.0 | 38.4 |
Casino Segment [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 671.9 |  | 679.6
Capital expenditures | 5.9 | 15.6 |
TwinSpires [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 222.0 |  | 215.9
Capital expenditures | 4.7 | 5.2 |
Big Fish Games [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 0.0 |  | 892.5
Capital expenditures | 0.0 | 3.5 |
Other Investments Segment [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 53.5 |  | 15.2
Capital expenditures | 17.6 | 0.7 |
Corporate |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 252.8 |  | $ 73.2
Capital expenditures | $ 1.0 | $ 0.6 |

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