Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net revenue:
Net revenue	$ 324.3	$ 252.9
Operating expense:
Selling, general and administrative expense	30.2	24.1
Impairment of intangible assets	0.0	17.5
Transaction expense, net	0.1	0.3
Total operating expense	277.6	264.5
Operating income (loss)	46.7	(11.6)
Other income (expense):
Interest expense, net	(19.4)	(19.3)
Equity in income (loss) of unconsolidated affiliates	24.9	(3.3)
Miscellaneous, net	0.1	0.0
Total other income (expense)	5.6	(22.6)
Income (loss) from continuing operations before provision for income taxes	52.3	(34.2)
Income tax (provision) benefit	(16.2)	11.6
Income (loss) from continuing operations, net of tax	36.1	(22.6)
Loss from discontinued operations, net of tax	0.0	(0.9)
Net income (loss)	36.1	(23.5)
Net loss attributable to noncontrolling interest	0.0	(0.1)
Net income (loss) and comprehensive income (loss) attributable to Churchill Downs Incorporated	$ 36.1	$ (23.4)
Net (loss) income per common share data, basic:
Continuing operations (in dollars per share)	$ 0.93	$ (0.57)
Discontinued operations (in dollars per share)	0	(0.02)
Net (loss) income per common share data - basic (in dollars per share)	0.93	(0.59)
Net (loss) income per common share data, diluted:
Continuing operations (in dollars per share)	0.91	(0.57)
Discontinued operations (in dollars per share)	0	(0.02)
Net (loss) income per common share data - diluted (in dollars per share)	$ 0.91	$ (0.59)
Weighted average shares outstanding:
Basic (in shares)	39.0	39.7
Diluted (in shares)	39.6	39.7
Live and Historical Racing
Net revenue:
Net revenue	$ 63.2	$ 28.1
Operating expense:
Operating expense	54.7	33.1
TwinSpires
Net revenue:
Net revenue	99.7	69.1
Operating expense:
Operating expense	73.0	50.8
Gaming
Net revenue:
Net revenue	152.0	145.9
Operating expense:
Operating expense	106.3	124.1
All Other
Net revenue:
Net revenue	9.4	9.8
Operating expense:
Operating expense	$ 13.3	$ 14.6