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Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 22, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jan. 09, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Current liabilities of discontinued operations |  | $ 124.0 | $ 124.0 | $ 0.0 |
Big Fish Games | Pro Forma | Cheryl Kater v. Churchill Downs Incorporated | Pending Litigation |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Amount to be paid into a settlement fund | $ 155.0 |  |  |  |
Big Fish Games | CDI | Cheryl Kater v. Churchill Downs Incorporated | Pending Litigation |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Pre-tax settlement paid in cash | 124.0 | $ 124.0 | $ 124.0 |  |
Big Fish Games | Aristocrat | Cheryl Kater v. Churchill Downs Incorporated | Pending Litigation |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Pre-tax settlement paid in cash | $ 31.0 |  |  |  |
Discontinued Operations, Disposed of by Sale | Big Fish Games |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Purchase price |  |  |  |  | $ 990.0

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