Segment Information - Schedule of Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 559.5	$ 364.1
Adjusted EBITDA	222.9	128.5
Live and Historical
Segment Reporting Information [Line Items]
Revenues	215.8	87.2
Taxes and purses	(56.5)	(26.8)
Marketing and advertising	(8.2)	(2.9)
Salaries and benefits	(21.8)	(10.9)
Content expense	(1.5)	(0.6)
Selling, general and administrative expense	(8.7)	(3.3)
Other operating expense	(37.0)	(14.8)
Other income	0.0	0.0
Adjusted EBITDA	82.1	27.9
TwinSpires
Segment Reporting Information [Line Items]
Revenues	96.3	101.4
Taxes and purses	(5.0)	(7.5)
Marketing and advertising	(1.4)	(5.1)
Salaries and benefits	(6.2)	(6.7)
Content expense	(43.0)	(43.1)
Selling, general and administrative expense	(2.3)	(2.6)
Other operating expense	(10.0)	(12.3)
Other income	1.0	0.0
Adjusted EBITDA	29.4	24.1
Gaming
Segment Reporting Information [Line Items]
Revenues	251.6	179.2
Taxes and purses	(83.6)	(67.3)
Marketing and advertising	(8.6)	(3.5)
Salaries and benefits	(34.5)	(23.9)
Content expense	(1.8)	(1.5)
Selling, general and administrative expense	(12.2)	(6.6)
Other operating expense	(30.0)	(20.0)
Other income	48.6	34.7
Adjusted EBITDA	$ 129.5	$ 91.1