Segment Information - Schedule of Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total net revenue	$ 1,809.8	$ 1,597.2	$ 1,054.0
Adjusted EBITDA	763.6	627.0	286.5
Live and Historical Racing
Segment Reporting Information [Line Items]
Total net revenue	646.4	430.6	188.8
Taxes and purses	(168.6)	(126.3)	(64.1)
Marketing and advertising	(19.8)	(12.9)	(6.2)
Salaries and benefits	(63.4)	(48.4)	(32.5)
Content expense	(3.4)	(2.5)	(1.5)
Selling, general and administrative expense	(18.6)	(12.8)	(8.7)
Other operating expense	(85.5)	(53.0)	(36.8)
Other income	0.4	0.3	0.1
Adjusted EBITDA	287.5	175.0	39.1
TwinSpires
Segment Reporting Information [Line Items]
Total net revenue	441.6	457.8	435.6
Taxes and purses	(27.0)	(30.7)	(25.1)
Marketing and advertising	(13.0)	(49.4)	(16.5)
Salaries and benefits	(26.8)	(27.0)	(24.6)
Content expense	(203.3)	(206.6)	(202.7)
Selling, general and administrative expense	(9.7)	(11.0)	(10.4)
Other operating expense	(47.8)	(50.4)	(40.5)
Other income	0.1	0.0	0.1
Adjusted EBITDA	114.1	82.7	115.9
Gaming
Segment Reporting Information [Line Items]
Total net revenue	761.8	698.4	437.8
Taxes and purses	(278.1)	(264.4)	(171.6)
Marketing and advertising	(18.9)	(11.8)	(7.5)
Salaries and benefits	(102.7)	(87.1)	(75.9)
Content expense	(8.3)	(4.7)	(3.5)
Selling, general and administrative expense	(31.3)	(27.9)	(25.4)
Other operating expense	(91.5)	(72.3)	(59.7)
Other income	190.9	181.7	78.9
Adjusted EBITDA	$ 421.9	$ 411.9	$ 173.1