Segment Information - Reconciliation of Comprehensive Income to Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Net income attributable to Churchill Downs Incorporated	$ 216.9	$ 76.7	$ 209.3	$ 80.4	$ 293.6	$ 289.7
Net income attributable to noncontrolling interest	0.7		0.9		1.2	0.9
Net income	217.6		210.2		294.8	290.6
Depreciation and amortization	57.8		49.2		117.0	96.1
Interest expense	74.2		73.5		146.5	143.9
Income tax provision	74.4		84.1		93.1	105.5
Stock-based compensation expense	7.2		8.9		10.8	16.1
Pre-opening expense	2.4		7.5		6.6	15.8
Other expenses, net	5.2		0.1		4.8	0.3
Asset impairments	2.4		0.0		2.4	0.0
Transaction expense, net	1.1		0.6		1.5	4.7
Interest, depreciation and amortization expense related to equity investments	9.6		10.5		19.5	20.8
Other charges and recoveries, net	(1.0)		(0.1)		(1.0)	(6.8)
Total adjustments	233.3		234.6		401.2	396.7
Adjusted EBITDA	450.9		444.8		696.0	687.3
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	471.8		466.1		738.6	729.3
All Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	(20.9)		(21.3)		(42.6)	(42.0)
Live and Historical Racing | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	296.5		279.2		398.5	380.0
Wagering Services and Solutions | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	48.0		46.2		89.3	85.8
Gaming | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	127.3		140.7		250.8	263.5
Rivers Des Plaines
Segment Reporting Information [Line Items]
Rivers Des Plaines' legal reserves and transaction costs	$ 0.0		$ 0.3		$ 0.0	$ 0.3