Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net revenue:
Churchill Downs	$ 274.2	$ 195.8	$ 161.3
Online Wagering	290.5	290.2	255.6
Gaming	692.4	449.5	389.3
All Other	72.6	73.5	76.4
Total net revenue	1,329.7	1,009.0	882.6
Operating expense:
Churchill Downs	163.8	116.3	89.5
Online Wagering	205.8	196.1	170.2
Gaming	528.1	331.0	293.8
All Other	89.0	75.9	75.9
Selling, general and administrative expense	122.0	90.6	83.5
Impairment of tangible and other intangible assets	0.0	0.0	21.7
Transaction expense, net	5.3	10.3	2.3
Total operating expense	1,114.0	820.2	736.9
Operating income	215.7	188.8	145.7
Other income (expense):
Interest expense, net	(70.9)	(40.1)	(49.3)
Loss on extinguishment of debt	0.0	0.0	(20.7)
Equity in income of unconsolidated investments	50.6	29.6	25.5
Gain on Ocean Downs/Saratoga transaction	0.0	54.9	0.0
Miscellaneous, net	1.0	0.7	1.3
Total other (expense) income	(19.3)	45.1	(43.2)
Income from continuing operations before provision for income taxes	196.4	233.9	102.5
Income tax (provision) benefit	(56.8)	(51.3)	19.9
Income from continuing operations, net of tax	139.6	182.6	122.4
(Loss) income from discontinued operations, net of tax	(2.4)	170.2	18.1
Net income	137.2	352.8	140.5
Net loss attributable to noncontrolling interest	0.3	0.0	0.0
Net income attributable to Churchill Downs Incorporated	$ 137.5	$ 352.8	$ 140.5
Net income (loss) per common share data - basic:
Continuing operations (in dollars per share)	$ 3.49	$ 4.42	$ 2.59
Discontinued operations (in dollars per share)	(0.06)	4.12	0.38
Net income per common share - basic (in dollars per share)	3.43	8.54	2.97
Net income (loss) per common share data - diluted:
Continuing operations (in dollars per share)	3.44	4.39	2.55
Discontinued operations (in dollars per share)	(0.06)	4.09	0.37
Net income per common share - diluted (in dollars per share)	$ 3.38	$ 8.48	$ 2.92
Weighted average shares outstanding:
Basic (in shares)	40.1	41.3	47.2
Diluted (in shares)	40.6	41.6	48.0
Other comprehensive income (loss):
Foreign currency translation, net of tax	$ 0.0	$ 0.6	$ (0.1)
Change in pension benefits, net of tax	0.0	(0.2)	0.0
Other comprehensive income (loss)	0.0	0.4	(0.1)
Comprehensive income attributable to CDI	$ 137.5	$ 353.2	$ 140.4