Segment Information - Schedule of Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 242.5	$ 222.9
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	263.2	241.0
Live and Historical | Operating Segments
Segment Reporting Information [Line Items]
Net revenue	248.9	215.8
Gaming taxes and purses	(65.0)	(56.5)
Marketing and advertising	(9.3)	(8.2)
Salaries and benefits	(26.8)	(21.8)
Content expense	(1.3)	(1.5)
Selling, general and administrative expense	(8.8)	(8.7)
Maintenance, insurance and utilities	(10.3)	(9.3)
Property and other taxes	(2.7)	(1.2)
Other operating expense	(23.9)	(26.5)
Other income	0.0	0.0
Adjusted EBITDA	100.8	82.1
TwinSpires | Operating Segments
Segment Reporting Information [Line Items]
Net revenue	114.1	96.3
Gaming taxes and purses	(4.9)	(5.0)
Marketing and advertising	(1.2)	(1.4)
Salaries and benefits	(7.9)	(6.2)
Content expense	(44.0)	(43.0)
Selling, general and administrative expense	(4.5)	(2.3)
Maintenance, insurance and utilities	(1.0)	(0.9)
Property and other taxes	(0.1)	0.0
Other operating expense	(10.9)	(9.1)
Other income	0.0	1.0
Adjusted EBITDA	39.6	29.4
Gaming | Operating Segments
Segment Reporting Information [Line Items]
Net revenue	243.2	251.6
Gaming taxes and purses	(80.5)	(83.6)
Marketing and advertising	(7.8)	(8.6)
Salaries and benefits	(38.0)	(34.5)
Content expense	(1.8)	(1.8)
Selling, general and administrative expense	(10.2)	(12.2)
Maintenance, insurance and utilities	(9.6)	(9.8)
Property and other taxes	(3.4)	(3.3)
Other operating expense	(18.3)	(16.9)
Other income	49.2	48.6
Adjusted EBITDA	$ 122.8	$ 129.5