Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Shares outstanding, beginning (in shares) at Dec. 31, 2021		76,200,000
Shareholders' equity, beginning at Dec. 31, 2021	$ 306.8	$ 0.0	$ 307.7	$ (0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Churchill Downs Incorporated	439.4		439.4
Issuance of common stock (in shares)		600,000
Issuance of common stock	$ 2.7	$ 2.7
Repurchase of common stock (in shares)	(1,747,844)	(1,800,000)
Repurchase of common stock	$ (175.5)	$ (34.5)	(141.0)
Taxes paid related to net share settlement of stock awards (in shares)		(200,000)
Taxes paid related to net share settlement of stock awards	(26.9)		(26.9)
Stock-based compensation	31.8	$ 31.8
Cash dividends	(26.8)		(26.8)
Shares outstanding, ending (in shares) at Dec. 31, 2022		74,800,000
Shareholders' equity, ending at Dec. 31, 2022	551.5	$ 0.0	552.4	(0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Churchill Downs Incorporated	417.3		417.3
Issuance of common stock (in shares)		300,000
Issuance of common stock	$ 3.1	$ 3.1
Repurchase of common stock (in shares)	(461,761)	(500,000)
Repurchase of common stock	$ (55.3)	$ (36.0)	(19.3)
Taxes paid related to net share settlement of stock awards (in shares)		(100,000)
Taxes paid related to net share settlement of stock awards	(26.5)		(26.5)
Stock-based compensation	32.9	$ 32.9
Cash dividends	(28.5)		(28.5)
Other	(0.9)		(0.9)
Shares outstanding, ending (in shares) at Dec. 31, 2023		74,500,000
Shareholders' equity, ending at Dec. 31, 2023	893.6	$ 0.0	894.5	(0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Churchill Downs Incorporated	426.8		426.8
Issuance of common stock (in shares)		700,000
Issuance of common stock	$ 4.2	$ 4.2
Repurchase of common stock (in shares)	(506,300)	(1,500,000)
Repurchase of common stock	$ (189.0)	$ (35.8)	(153.2)
Reclassification to liability awards	(20.9)		(20.9)
Taxes paid related to net share settlement of stock awards (in shares)		(200,000)
Taxes paid related to net share settlement of stock awards	(27.3)		(27.3)
Stock-based compensation	32.0	$ 32.0
Cash dividends	(30.1)		(30.1)
Other	(5.7)	$ (0.4)	(5.2)	(0.1)
Shares outstanding, ending (in shares) at Dec. 31, 2024		73,500,000
Shareholders' equity, ending at Dec. 31, 2024	$ 1,083.6	$ 0.0	$ 1,084.6	$ (1.0)