Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Shares outstanding, beginning (in shares) at Dec. 31, 2023		74.5
Shareholders' equity, beginning at Dec. 31, 2023	$ 893.6	$ 0.0	$ 894.5	$ (0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income and comprehensive income attributable to Churchill Downs Incorporated	80.4		80.4
Issuance of common stock (in shares)		0.3
Repurchase of common stock (in shares)		(1.2)
Repurchase of common stock	(145.7)	$ (7.2)	(138.5)
Taxes paid related to net share settlement of stock awards (in shares)		(0.1)
Taxes paid related to net share settlement of stock awards	(7.6)		(7.6)
Stock-based compensation	7.2	$ 7.2
Other	(1.0)		(1.0)
Shares outstanding, ending (in shares) at Mar. 31, 2024		73.5
Shareholders' equity, ending at Mar. 31, 2024	826.9	$ 0.0	827.8	(0.9)
Shares outstanding, beginning (in shares) at Dec. 31, 2023		74.5
Shareholders' equity, beginning at Dec. 31, 2023	893.6	$ 0.0	894.5	(0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income and comprehensive income attributable to Churchill Downs Incorporated	289.7
Shares outstanding, ending (in shares) at Jun. 30, 2024		73.4
Shareholders' equity, ending at Jun. 30, 2024	1,030.9	$ 0.0	1,031.9	(1.0)
Shares outstanding, beginning (in shares) at Mar. 31, 2024		73.5
Shareholders' equity, beginning at Mar. 31, 2024	826.9	$ 0.0	827.8	(0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income and comprehensive income attributable to Churchill Downs Incorporated	209.3		209.3
Repurchase of common stock (in shares)		(0.1)
Repurchase of common stock	(13.0)	$ (8.9)	(4.1)
Taxes paid related to net share settlement of stock awards	(0.2)		(0.2)
Stock-based compensation	8.9	$ 8.9
Other	(1.0)		(0.9)	(0.1)
Shares outstanding, ending (in shares) at Jun. 30, 2024		73.4
Shareholders' equity, ending at Jun. 30, 2024	1,030.9	$ 0.0	1,031.9	(1.0)
Shares outstanding, beginning (in shares) at Dec. 31, 2024		73.5
Shareholders' equity, beginning at Dec. 31, 2024	1,083.6	$ 0.0	1,084.6	(1.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income and comprehensive income attributable to Churchill Downs Incorporated	76.7		76.7
Issuance of common stock (in shares)		0.1
Repurchase of common stock (in shares)		(0.8)
Repurchase of common stock	(89.4)	$ (1.0)	(88.4)
Taxes paid related to net share settlement of stock awards	(3.9)	(3.9)
Stock-based compensation	4.9	$ 4.9
Other	(0.2)		(0.2)
Shares outstanding, ending (in shares) at Mar. 31, 2025		72.8
Shareholders' equity, ending at Mar. 31, 2025	1,071.7	$ 0.0	1,072.7	(1.0)
Shares outstanding, beginning (in shares) at Dec. 31, 2024		73.5
Shareholders' equity, beginning at Dec. 31, 2024	1,083.6	$ 0.0	1,084.6	(1.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income and comprehensive income attributable to Churchill Downs Incorporated	293.6
Shares outstanding, ending (in shares) at Jun. 30, 2025		70.2
Shareholders' equity, ending at Jun. 30, 2025	1,041.6	$ 0.0	1,042.6	(1.0)
Shares outstanding, beginning (in shares) at Mar. 31, 2025		72.8
Shareholders' equity, beginning at Mar. 31, 2025	1,071.7	$ 0.0	1,072.7	(1.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income and comprehensive income attributable to Churchill Downs Incorporated	216.9		216.9
Repurchase of common stock (in shares)		(2.6)
Repurchase of common stock	(250.4)	$ (5.3)	(245.1)
Taxes paid related to net share settlement of stock awards	(0.1)	(0.1)
Stock-based compensation	5.4	$ 5.4
Other	(1.9)		(1.9)
Shares outstanding, ending (in shares) at Jun. 30, 2025		70.2
Shareholders' equity, ending at Jun. 30, 2025	$ 1,041.6	$ 0.0	$ 1,042.6	$ (1.0)