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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