Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net revenue:
Net revenue	$ 393.0	$ 337.8	$ 1,232.4	$ 775.8
Operating expense:
Selling, general and administrative expense	36.1	38.8	99.7	85.3
Asset impairments	0.0	0.0	11.2	17.5
Transaction expense, net	2.0	0.5	2.1	1.0
Total operating expense	325.4	288.3	982.7	738.3
Operating income	67.6	49.5	249.7	37.5
Other income (expense):
Interest expense, net	(21.7)	(19.7)	(63.1)	(59.3)
Equity in income of unconsolidated affiliates	41.7	27.6	103.0	13.2
Miscellaneous, net	0.1	(0.4)	0.3	(0.1)
Total other income (expense)	20.1	7.5	40.2	(46.2)
Income (loss) from continuing operations before (provision) benefit for income taxes	87.7	57.0	289.9	(8.7)
Income tax (provision) benefit	(26.3)	(13.9)	(84.1)	5.6
Net income (loss) from continuing operations	61.4	43.1	205.8	(3.1)
Loss from discontinued operations, net of tax	0.0	0.0	0.0	(96.1)
Net income (loss)	61.4	43.1	205.8	(99.2)
Net loss attributable to noncontrolling interest	0.0	(0.1)	0.0	(0.2)
Net income (loss) and comprehensive income (loss) attributable to Churchill Downs Incorporated	$ 61.4	$ 43.2	$ 205.8	$ (99.0)
Net income (loss) per common share data - basic:
Continuing operations (in dollars per share)	$ 1.59	$ 1.09	$ 5.31	$ (0.07)
Discontinued operations (in dollars per share)	0	0	0	(2.43)
Net income (loss) per common share data - basic (in dollars per share)	1.59	1.09	5.31	(2.50)
Net income (loss) per common share data - diluted:
Continuing operations (in dollars per share)	1.57	1.08	5.23	(0.07)
Discontinued operations (in dollars per share)	0	0	0	(2.43)
Net income (loss) per common share data - diluted (in dollars per share)	$ 1.57	$ 1.08	$ 5.23	$ (2.50)
Weighted average shares outstanding:
Basic (in shares)	38.6	39.5	38.7	39.6
Diluted (in shares)	39.2	40.1	39.3	39.6
Live and Historical Racing
Net revenue:
Net revenue	$ 79.7	$ 63.8	$ 318.8	$ 115.2
Operating expense:
Operating expense	62.3	55.7	217.3	121.9
TwinSpires
Net revenue:
Net revenue	101.8	127.1	337.1	317.5
Operating expense:
Operating expense	77.5	84.0	247.3	209.5
Gaming
Net revenue:
Net revenue	185.3	133.5	523.3	316.7
Operating expense:
Operating expense	127.7	96.2	355.0	265.8
All Other
Net revenue:
Net revenue	26.2	13.4	53.2	26.4
Operating expense:
Operating expense	$ 19.8	$ 13.1	$ 50.1	$ 37.3