Investments in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investments in and Advances to Affiliates [Line Items]
Net revenue	$ 642.6	$ 590.9
Operating and SG&A expense	54.5	54.8
Operating income	134.6	126.3
Net income and comprehensive income attributable to Churchill Downs Incorporated	76.7	80.4
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments in and Advances to Affiliates [Line Items]
Net revenue	205.3	216.9
Operating and SG&A expense	130.3	134.9
Depreciation and amortization	6.2	6.3
Operating income	68.8	75.7
Interest and other, net	(10.6)	(11.0)
Net income and comprehensive income attributable to Churchill Downs Incorporated	$ 58.2	$ 64.7