Segment Information - Reconciliation of Comprehensive Income to Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net income (loss) and comprehensive income (loss) attributable to Churchill Downs Incorporated				$ 439.4	$ 249.1	$ (81.9)
Net loss attributable to noncontrolling interest				0.0	0.0	0.2
Net income (loss)				439.4	249.1	(82.1)
Loss from discontinued operations, net of tax				0.0	0.0	95.4
Income from continuing operations, net of tax				439.4	249.1	13.3
Depreciation and amortization				113.7	103.2	92.9
Interest expense				147.3	84.7	80.0
Income tax provision (benefit)				169.4	94.5	(5.3)
EBITDA				869.8	531.5	180.9
Stock-based compensation expense				31.8	27.8	23.7
Legal reserves				3.8	0.0	0.0
Other charges				7.4	0.2	0.8
Pre-opening expense and other expense				13.2	5.8	11.2
Interest, depreciation and amortization expense related to equity investments				42.8	41.5	38.5
Changes in fair value of Rivers Des Plaines' interest rate swaps				(12.6)	(12.9)	12.9
Rivers Des Plaines' legal reserves and transactions costs				0.6	9.9	0.0
Other charges and recoveries, net				1.0	0.0	0.0
Gain on Calder land sale				(274.6)	0.0	0.0
Transaction expense, net				42.1	7.9	1.0
Asset impairments				38.3	15.3	17.5
Total adjustments to EBITDA				(106.2)	95.5	105.6
Adjusted EBITDA				763.6	627.0	286.5
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA				823.5	669.6	328.1
All Other
Segment Reporting Information [Line Items]
Adjusted EBITDA				(59.9)	(42.6)	(41.6)
Live and Historical Racing
Segment Reporting Information [Line Items]
Asset impairments			$ 11.2
Adjusted EBITDA				287.5	175.0	39.1
Live and Historical Racing | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA				287.5	175.0	39.1
TwinSpires
Segment Reporting Information [Line Items]
Asset impairments	$ 4.9	$ 4.1
Adjusted EBITDA				114.1	82.7	115.9
TwinSpires | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA				114.1	82.7	115.9
Gaming
Segment Reporting Information [Line Items]
Adjusted EBITDA				421.9	411.9	173.1
Gaming | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA				$ 421.9	$ 411.9	$ 173.1