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Segment Information - Total Asset Information For Segments (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | $ 2,327.4 |  | $ 2,254.4
Capital expenditures | 89.1 | $ 44.1 |
Racing Segment [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 463.7 |  | 454.6
Capital expenditures | 47.8 | 23.4 |
Casino Segment [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 675.1 |  | 628.7
Capital expenditures | 26.0 | 9.7 |
TwinSpires [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 213.0 |  | 209.9
Capital expenditures | 7.3 | 5.4 |
Big Fish Games [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 902.8 |  | 893.8
Capital expenditures | 5.6 | 3.6 |
Other Investments Segment [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 11.9 |  | 11.1
Capital expenditures | 1.3 | 0.8 |
Corporate |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | 60.9 |  | $ 56.3
Capital expenditures | $ 1.1 | $ 1.2 |

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