Cover - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 10, 2020	Jun. 28, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-33998
Entity Registrant Name	Churchill Downs Inc
Entity Incorporation, State or Country Code	KY
Entity Tax Identification Number	61-0156015
Entity Address, Address Line One	600 North Hurstbourne Parkway, Suite 400
Entity Address, City or Town	Louisville,
Entity Address, State or Province	KY
Entity Address, Postal Zip Code	40222
City Area Code	502
Local Phone Number	636-4400
Title of 12(b) Security	Common Stock, No Par Value
Trading Symbol	CHDN
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		39,622,384
Entity Public Float			$ 4,000,887,471
Documents Incorporated by Reference	Portions of the Registrant’s Proxy Statement for its Annual Meeting of Shareholders to be held on April 21, 2020 are incorporated by reference herein in response to Items 10, 11, 12, 13 and 14 of Part III of Form 10-K.
Entity Central Index Key	0000020212
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false