Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net revenue:
Total net revenue	$ 185.1	$ 477.4	$ 438.0	$ 742.8
Operating expense:
Selling, general and administrative expense	22.4	30.1	46.5	55.0
Impairment of intangible assets	0.0	0.0	17.5	0.0
Transaction expense, net	0.2	0.6	0.5	4.1
Total operating expense	185.5	321.0	450.0	558.4
Operating (loss) income	(0.4)	156.4	(12.0)	184.4
Other income (expense):
Interest expense, net	(20.3)	(19.4)	(39.6)	(33.1)
Equity in (loss) income of unconsolidated affiliates	(11.1)	9.5	(14.4)	13.6
Miscellaneous, net	0.3	0.4	0.3	0.4
Total other expense	(31.1)	(9.5)	(53.7)	(19.1)
(Loss) income from continuing operations before provision for income taxes	(31.5)	146.9	(65.7)	165.3
Income tax benefit (provision)	7.9	(38.6)	19.5	(45.1)
(Loss) income from continuing operations, net of tax	(23.6)	108.3	(46.2)	120.2
Loss from discontinued operations, net of tax	(95.2)	(1.2)	(96.1)	(1.5)
Net (loss) income	(118.8)	107.1	(142.3)	118.7
Net loss attributable to noncontrolling interest	0.0	0.0	(0.1)	0.0
Net (loss) income and comprehensive (loss) income attributable to CDI	$ (118.8)	$ 107.1	$ (142.2)	$ 118.7
Net (loss) income per common share data, basic:
Continuing operations (in dollars per share)	$ (0.59)	$ 2.69	$ (1.16)	$ 2.99
Discontinued operations (in dollars per share)	(2.41)	(0.03)	(2.43)	(0.04)
Net (loss) income per common share data - basic (in dollars per share)	(3.00)	2.66	(3.59)	2.95
Net (loss) income per common share data, diluted:
Continuing operations (in dollars per share)	(0.59)	2.66	(1.16)	2.96
Discontinued operations (in dollars per share)	(2.41)	(0.03)	(2.43)	(0.04)
Net (loss) income per common share data - diluted (in dollars per share)	$ (3.00)	$ 2.63	$ (3.59)	$ 2.92
Weighted average shares outstanding:
Basic (in shares)	39.5	40.1	39.6	40.3
Diluted (in shares)	39.5	40.7	39.6	40.7
Churchill Downs
Net revenue:
Churchill Downs			$ 46.8	$ 203.2
Total net revenue	$ 23.3	$ 182.2
Operating expense:
Operating expense	31.1	73.6	57.7	97.0
Online Wagering
Net revenue:
Online Wagering			188.5	158.7
Total net revenue	121.2	95.6
Operating expense:
Operating expense	74.6	62.0	124.7	107.1
Gaming
Net revenue:
Gaming			184.9	346.4
Total net revenue	37.3	177.6
Operating expense:
Operating expense	45.6	133.2	170.4	258.2
All Other
Net revenue:
All Other			17.8	34.5
Total net revenue	3.3	22.0
Operating expense:
Operating expense	$ 11.6	$ 21.5	$ 32.7	$ 37.0