Investments in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (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
Investments in and Advances to Affiliates [Line Items]
Net revenue	$ 934.4		$ 890.7		$ 1,577.0	$ 1,481.6
Operating and SG&A expense	60.9		57.4		115.4	112.2
Operating income	327.7		330.0		462.3	456.3
Net income attributable to Churchill Downs Incorporated	216.9	$ 76.7	209.3	$ 80.4	293.6	289.7
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments in and Advances to Affiliates [Line Items]
Net revenue	216.0		215.9		421.3	432.8
Operating and SG&A expense	134.8		132.2		265.1	267.1
Depreciation and amortization	5.9		7.0		12.1	13.3
Operating income	75.3		76.7		144.1	152.4
Interest and other, net	(10.3)		(11.4)		(20.9)	(22.4)
Net income attributable to Churchill Downs Incorporated	$ 65.0		$ 65.3		$ 123.2	$ 130.0