Segment Information - Information About Reported Segments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 252.9	$ 265.4
Intercompany net revenues	0.0	0.0
Net (loss) income and comprehensive (loss) income attributable to CDI	(23.4)	11.6
Net loss attributable to noncontrolling interest	(0.1)	0.0
Net (loss) income	(23.5)	11.6
Loss from discontinued operations, net of tax	(0.9)	(0.3)
(Loss) income from continuing operations, net of tax	(22.6)	11.9
Depreciation and amortization	22.0	20.8
Interest expense	19.3	13.7
Income tax (benefit) provision	(11.6)	6.5
EBITDA	7.1	52.9
Stock-based compensation expense	4.3	4.7
Other charges	0.0	0.5
Pre-opening expense and other expense	1.7	1.3
Impairment of intangible assets	17.5	0.0
Transaction expense, net	0.3	3.5
Interest, depreciation and amortization expense related to equity investments	9.5	3.5
Fair Value of Interest Rate Swaps	14.9	4.3
Midwest Gaming's recapitalization and transactions costs	0.0	3.9
Total adjustments to EBITDA	48.2	21.7
Adjusted EBITDA	55.3	74.6
Churchill Downs
Segment Reporting Information [Line Items]
Revenues	23.8	21.4
Adjusted Segment EBITDA	1.9	1.4
Online Wagering
Segment Reporting Information [Line Items]
Revenues	67.7	63.4
Impairment of intangible assets	2.5
Adjusted Segment EBITDA	15.0	16.9
Gaming
Segment Reporting Information [Line Items]
Revenues	149.1	170.1
Adjusted Segment EBITDA	49.0	64.8
Gaming \| Presque Isle Downs & Casino
Segment Reporting Information [Line Items]
Impairment of intangible assets	12.5
Operating Segments
Segment Reporting Information [Line Items]
Revenues	252.9	265.4
Adjusted Segment EBITDA	65.9	83.1
Operating Segments \| Churchill Downs
Segment Reporting Information [Line Items]
Revenues	23.5	21.0
Intercompany net revenues	0.3	0.4
Adjusted Segment EBITDA	1.9	1.4
Operating Segments \| Churchill Downs \| Churchill Downs Racetrack
Segment Reporting Information [Line Items]
Revenues	1.9	2.3
Operating Segments \| Churchill Downs \| Derby City Gaming
Segment Reporting Information [Line Items]
Revenues	21.6	18.7
Operating Segments \| Online Wagering
Segment Reporting Information [Line Items]
Revenues	67.3	63.1
Intercompany net revenues	0.4	0.3
Adjusted Segment EBITDA	15.0	16.9
Operating Segments \| Online Wagering \| TwinSpires
Segment Reporting Information [Line Items]
Revenues	66.6	63.0
Operating Segments \| Online Wagering \| Online Sports Betting and iGaming
Segment Reporting Information [Line Items]
Revenues	0.7	0.1
Operating Segments \| Gaming
Segment Reporting Information [Line Items]
Revenues	147.6	168.8
Intercompany net revenues	1.5	1.3
Adjusted Segment EBITDA	49.0	64.8
Operating Segments \| Gaming \| Fair Grounds and VSI
Segment Reporting Information [Line Items]
Revenues	31.6	37.5
Operating Segments \| Gaming \| Presque Isle Downs & Casino
Segment Reporting Information [Line Items]
Revenues	27.6	29.7
Operating Segments \| Gaming \| Calder
Segment Reporting Information [Line Items]
Revenues	21.8	25.4
Operating Segments \| Gaming \| Oxford
Segment Reporting Information [Line Items]
Revenues	20.1	23.9
Operating Segments \| Gaming \| Ocean Downs
Segment Reporting Information [Line Items]
Revenues	14.8	18.4
Operating Segments \| Gaming \| Riverwalk
Segment Reporting Information [Line Items]
Revenues	12.7	16.3
Operating Segments \| Gaming \| Harlow’s
Segment Reporting Information [Line Items]
Revenues	11.7	15.3
Operating Segments \| Gaming \| Lady Luck Nemacolin
Segment Reporting Information [Line Items]
Revenues	7.3	2.3
Segment Reconciling Items \| All Other
Segment Reporting Information [Line Items]
Revenues	14.5	12.5
Intercompany net revenues	3.0	2.2
Adjusted Segment EBITDA	(10.6)	(8.5)
Eliminations
Segment Reporting Information [Line Items]
Intercompany net revenues	$ (5.2)	$ (4.2)

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