Segment Information - Schedule of Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 235.3	$ 218.2	$ 922.6	$ 804.8
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	258.8	237.1	988.1	858.9
Live and Historical Racing | Operating Segments
Segment Reporting Information [Line Items]
Revenues	252.4	225.5	991.5	849.3
Gaming taxes and purses	(66.7)	(62.0)	(231.7)	(203.9)
Marketing and advertising	(9.3)	(7.6)	(31.1)	(27.9)
Salaries and benefits	(31.1)	(27.9)	(94.4)	(80.0)
Content expense	(1.7)	(1.6)	(5.1)	(5.1)
Selling, general and administrative expense	(9.4)	(7.4)	(26.7)	(23.4)
Maintenance, insurance and utilities	(12.8)	(12.5)	(34.6)	(31.9)
Property and other taxes	(1.9)	(1.7)	(6.4)	(4.4)
Other operating expense	(26.6)	(24.8)	(88.8)	(87.3)
Other income	0.1	0.9	0.3	1.1
Adjusted EBITDA	93.0	80.9	473.0	386.5
TwinSpires | Operating Segments
Segment Reporting Information [Line Items]
Revenues	118.7	112.4	392.7	347.8
Gaming taxes and purses	(5.5)	(5.8)	(17.7)	(17.8)
Marketing and advertising	(1.4)	(1.3)	(7.5)	(8.0)
Salaries and benefits	(8.0)	(7.0)	(23.9)	(20.7)
Content expense	(45.9)	(49.4)	(163.2)	(161.1)
Selling, general and administrative expense	(4.2)	(3.0)	(13.0)	(8.1)
Maintenance, insurance and utilities	(1.1)	(0.9)	(3.1)	(2.6)
Property and other taxes	(0.1)	(0.2)	(0.2)	(0.3)
Other operating expense	(10.0)	(10.9)	(35.8)	(33.1)
Other income	0.0	0.0	0.0	1.1
Adjusted EBITDA	42.5	33.9	128.3	97.2
Gaming | Operating Segments
Segment Reporting Information [Line Items]
Revenues	270.3	244.9	787.9	744.4
Gaming taxes and purses	(87.8)	(81.4)	(251.8)	(246.7)
Marketing and advertising	(9.5)	(8.9)	(26.5)	(26.5)
Salaries and benefits	(42.7)	(35.2)	(121.0)	(109.2)
Content expense	(2.3)	(2.4)	(6.7)	(6.9)
Selling, general and administrative expense	(11.9)	(9.9)	(33.9)	(32.4)
Maintenance, insurance and utilities	(11.7)	(10.3)	(32.4)	(29.7)
Property and other taxes	(4.0)	(3.6)	(10.7)	(9.9)
Other operating expense	(21.1)	(18.2)	(59.8)	(52.5)
Other income	44.0	47.3	141.7	144.6
Adjusted EBITDA	$ 123.3	$ 122.3	$ 386.8	$ 375.2