Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net revenue:
Total net revenue	$ 1,597.2	$ 1,054.0	$ 1,329.7
Operating expense:
Selling, general and administrative expense	138.5	114.8	122.0
Asset impairments	15.3	17.5	0.0
Transaction expense, net	7.9	1.0	5.3
Total operating expense	1,312.8	993.8	1,114.0
Operating income	284.4	60.2	215.7
Other income (expense):
Interest expense, net	(84.7)	(80.0)	(70.9)
Equity in income of unconsolidated affiliates	143.2	27.7	50.6
Miscellaneous, net	0.7	0.1	1.0
Total other income (expense)	59.2	(52.2)	(19.3)
Income from continuing operations before provision for income taxes	343.6	8.0	196.4
Income tax (provision) benefit	(94.5)	5.3	(56.8)
Income from continued operations, net of tax	249.1	13.3	139.6
Loss from discontinued operations, net of tax	0.0	(95.4)	(2.4)
Net income (loss)	249.1	(82.1)	137.2
Net loss attributable to noncontrolling interest	0.0	(0.2)	(0.3)
Net income (loss) and comprehensive income (loss) attributable to Churchill Downs Incorporated	$ 249.1	$ (81.9)	$ 137.5
Net income (loss) per common share data - basic:
Continuing operations (in dollars per share)	$ 6.45	$ 0.34	$ 3.49
Discontinued operations (in dollars per share)	0	(2.41)	(0.06)
Net income (loss) per common share - basic (in dollars per share)	6.45	(2.07)	3.43
Net income (loss) per common share data - diluted:
Continuing operations (in dollars per share)	6.35	0.33	3.44
Discontinued operations (in dollars per share)	0	(2.41)	(0.06)
Net income (loss) per common share - diluted (in dollars per share)	$ 6.35	$ (2.08)	$ 3.38
Weighted average shares outstanding:
Basic (in shares)	38.6	39.6	40.1
Diluted (in shares)	39.2	40.1	40.6
Live and Historical Racing
Net revenue:
Total net revenue	$ 409.1	$ 169.6	$ 276.7
Operating expense:
Operating expense	288.9	179.0	178.8
TwinSpires
Net revenue:
Total net revenue	431.7	414.5	295.6
Operating expense:
Operating expense	325.4	275.8	207.9
Gaming
Net revenue:
Total net revenue	695.4	435.3	687.3
Operating expense:
Operating expense	476.3	357.9	526.0
All Other
Net revenue:
Total net revenue	61.0	34.6	70.1
Operating expense:
Operating expense	$ 60.5	$ 47.8	$ 74.0