Segment Information - Reconciliation of Comprehensive Income to Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Net income and comprehensive income attributable to Churchill Downs Incorporated	$ 76.7	$ 80.4
Net income attributable to noncontrolling interest	0.5	0.0
Net income	77.2	80.4
Depreciation and amortization	59.2	46.9
Interest expense	72.3	70.4
Income tax provision	18.7	21.4
Stock-based compensation expense	3.6	7.2
Pre-opening expense	4.2	8.3
Other expenses, net	(0.4)	0.2
Transaction expense, net	0.4	4.1
Interest, depreciation and amortization expense related to equity investments	9.9	10.3
Other charges and recoveries, net	0.0	(6.7)
Total adjustments	167.9	162.1
Adjusted EBITDA	245.1	242.5
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	266.8	263.2
All Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	(21.7)	(20.7)
Live and Historical Racing | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	102.0	100.8
Wagering Services and Solutions | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	41.3	39.6
Gaming | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 123.5	$ 122.8