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Segment Information - Information About Reported Segments (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net revenue	$ 337.8			$ 306.3			$ 775.8	$ 1,049.1
Intercompany net revenues	0.0			0.0			0.0	0.0
Net income (loss) and comprehensive income (loss) attributable to CDI	43.2			14.8			(99.0)	133.5
Net loss attributable to noncontrolling interest	0.1			0.0			0.2	0.0
Net income (loss)	43.1	$ (118.8)	$ (23.5)	14.8	$ 107.1	$ 11.6	(99.2)	133.5
Loss from discontinued operations, net of tax	0.0			0.4			96.1	1.9
Income (loss) from continuing operations, net of tax	43.1			15.2			(3.1)	135.4
Depreciation and amortization	22.4			22.0			66.5	64.3
Interest expense	19.7			18.9			59.3	52.0
Income tax provision (benefit)	13.9			8.0			(5.6)	53.1
EBITDA	99.1			64.1			117.1	304.8
Stock-based compensation expense	6.9			5.5			17.3	17.6
Legal reserves	0.0			3.3			0.0	3.6
Other charges	0.8			0.0			0.7	0.0
Pre-opening expense and other expense	6.2			1.2			9.8	3.6
Impairment of intangible assets	0.0			0.0			17.5	0.0
Transaction expense, net	0.5			0.9			1.0	5.0
Interest, depreciation and amortization expense related to equity investments	9.9			9.7			29.2	22.9
Changes in fair value of Midwest Gaming's interest rate swaps	(1.5)			3.2			14.7	15.4
Midwest Gaming's recapitalization and transactions costs	0.0			0.0			0.0	4.7
Other charges & recoveries, net	0.0			0.1			0.0	0.0
Total adjustments to EBITDA	22.8			23.9			90.2	72.8
Adjusted EBITDA	121.9			88.0			207.3	377.6
Churchill Downs
Segment Reporting Information [Line Items]
Net revenue	68.0			32.7			122.0	247.2
Adjusted Segment EBITDA	23.9			5.2			30.3	128.5
Online Wagering
Segment Reporting Information [Line Items]
Net revenue	126.4			70.4			315.7	229.8
Impairment of intangible assets			2.5
Adjusted Segment EBITDA	31.9			15.0			85.7	54.1
Gaming
Segment Reporting Information [Line Items]
Net revenue	134.9			178.6			321.3	526.5
Adjusted Segment EBITDA	75.4			71.7			122.4	212.6
Gaming \| Presque Isle
Segment Reporting Information [Line Items]
Impairment of intangible assets			$ 12.5
Operating Segments
Segment Reporting Information [Line Items]
Net revenue	337.8			306.3			775.8	1,049.1
Adjusted Segment EBITDA	131.2			91.9			238.4	395.2
Operating Segments \| Churchill Downs
Segment Reporting Information [Line Items]
Net revenue	60.8			31.4			107.6	234.6
Intercompany net revenues	7.2			1.3			14.4	12.6
Adjusted Segment EBITDA	23.9			5.2			30.3	128.5
Operating Segments \| Churchill Downs \| Churchill Downs Racetrack
Segment Reporting Information [Line Items]
Net revenue	34.9			8.9			52.4	172.2
Operating Segments \| Churchill Downs \| Derby City Gaming
Segment Reporting Information [Line Items]
Net revenue	25.9			22.5			55.2	62.4
Operating Segments \| Online Wagering
Segment Reporting Information [Line Items]
Net revenue	125.9			70.2			314.4	228.9
Intercompany net revenues	0.5			0.2			1.3	0.9
Adjusted Segment EBITDA	31.9			15.0			85.7	54.1
Operating Segments \| Online Wagering \| TwinSpires
Segment Reporting Information [Line Items]
Net revenue	124.1			70.2			310.6	228.8
Operating Segments \| Online Wagering \| Online Sports Betting and iGaming
Segment Reporting Information [Line Items]
Net revenue	1.8			0.0			3.8	0.1
Operating Segments \| Gaming
Segment Reporting Information [Line Items]
Net revenue	134.8			178.3			319.7	524.7
Intercompany net revenues	0.1			0.3			1.6	1.8
Adjusted Segment EBITDA	75.4			71.7			122.4	212.6
Operating Segments \| Gaming \| Fair Grounds and VSI
Segment Reporting Information [Line Items]
Net revenue	27.9			25.0			70.6	93.4
Operating Segments \| Gaming \| Presque Isle
Segment Reporting Information [Line Items]
Net revenue	27.7			38.1			57.3	104.9
Operating Segments \| Gaming \| Calder
Segment Reporting Information [Line Items]
Net revenue	6.5			24.4			34.0	75.4
Operating Segments \| Gaming \| Oxford
Segment Reporting Information [Line Items]
Net revenue	12.2			27.2			32.4	77.4
Operating Segments \| Gaming \| Ocean Downs
Segment Reporting Information [Line Items]
Net revenue	24.3			26.7			42.2	67.0
Operating Segments \| Gaming \| Riverwalk
Segment Reporting Information [Line Items]
Net revenue	16.0			13.6			36.1	44.1
Operating Segments \| Gaming \| Harlow’s
Segment Reporting Information [Line Items]
Net revenue	13.0			13.3			30.3	41.9
Operating Segments \| Gaming \| Lady Luck Nemacolin
Segment Reporting Information [Line Items]
Net revenue	7.2			10.0			16.8	20.6
Segment Reconciling Items \| All Other
Segment Reporting Information [Line Items]
Net revenue	16.3			26.4			34.1	60.9
Intercompany net revenues	4.0			3.4			9.9	9.0
Adjusted Segment EBITDA	(9.3)			(3.9)			(31.1)	(17.6)
Eliminations
Segment Reporting Information [Line Items]
Intercompany net revenues	$ (11.8)			$ (5.2)			$ (27.2)	$ (24.3)