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Segment Information - Reconciliation of Comprehensive Income to Adjusted EBITDA (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income attributable to CDI |  |  |  |  |  |  |  |  |  | $ 137.5 | $ 353.2 | $ 140.4
Foreign currency translation, net of tax |  |  |  |  |  |  |  |  |  | 0.0 | (0.6) | 0.1
Change in pension benefits, net of tax |  |  |  |  |  |  |  |  |  | 0.0 | 0.2 | 0.0
Net income attributable to CDI |  |  |  |  |  |  |  |  |  | 137.5 | 352.8 | 140.5
Net income before noncontrolling interest |  |  |  |  |  |  |  |  |  | (0.3) | 0.0 | 0.0
Net income |  |  |  |  |  |  |  |  |  | 137.2 | 352.8 | 140.5
Loss (income) from discontinued operations, net of tax |  | $ 0.5 | $ 0.4 | $ 1.2 | $ 0.3 | $ (4.1) | $ 1.7 | $ 0.1 | $ (167.9) | 2.4 | (170.2) | (18.1)
Income from continuing operations, net of tax |  | $ 4.2 | $ 15.2 | $ 108.3 | $ 11.9 | $ 7.3 | 58.0 | $ 103.2 | $ 14.1 | 139.6 | 182.6 | 122.4
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 96.4 | 63.6 | 97.1
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 20.7
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 56.8 | 51.3 | (19.9)
EBITDA |  |  |  |  |  |  |  |  |  | 363.7 | 337.6 | 228.5
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 23.8 | 21.1 | 27.1
Legal reserves |  |  |  |  |  |  |  |  |  | 3.6 | 0.0 | 0.0
Changes in fair value of Midwest Gaming's interest rate swaps |  |  |  |  |  |  |  |  |  | 12.4 | 0.0 | 0.0
Recapitalization Costs |  |  |  |  |  |  |  |  |  | 4.7 | 0.0 | 0.0
Gain on Ocean Downs/Saratoga transaction | $ (54.9) |  |  |  |  |  | $ (54.9) |  |  | 0.0 | (54.9) | 0.0
Impairment of tangible and other intangible assets |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 21.7
Total adjustments to EBITDA |  |  |  |  |  |  |  |  |  | 87.7 | (8.8) | 57.7
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 451.4 | 328.8 | 286.2
Churchill Downs |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 137.7 | 102.4 | 89.0
Online Wagering |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 66.3 | 79.0 | 69.9
Gaming |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 280.9 | 174.0 | 148.6
All Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 484.9 | 355.4 | 307.5
Total Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | (33.5) | (26.6) | (21.3)
Continuing Operations |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 96.4 | 63.6 | 56.0
Interest expense |  |  |  |  |  |  |  |  |  | 70.9 | 40.1 | 49.3
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 20.7
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 56.8 | 51.3 | (19.9)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 23.8 | 17.7 | 16.0
Other, net |  |  |  |  |  |  |  |  |  | 0.4 | (0.6) | 0.5
Pre-opening expense |  |  |  |  |  |  |  |  |  | 5.1 | 4.8 | 0.5
Interest, depreciation and amortization expense related to equity investments |  |  |  |  |  |  |  |  |  | 32.6 | 13.9 | 16.7
Other charges and recoveries, net |  |  |  |  |  |  |  |  |  | (0.2) | 0.0 | 0.0
Gain on Ocean Downs/Saratoga transaction |  |  |  |  |  |  |  |  |  | 0.0 | (54.9) | 0.0
Transaction expense, net |  |  |  |  |  |  |  |  |  | 5.3 | 10.3 | 2.3
Impairment of tangible and other intangible assets |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 21.7

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