Segment Information - Reconciliation of Comprehensive Income to Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net income and comprehensive income	$ 80.4	$ 155.7
Depreciation and amortization	46.9	37.9
Interest expense	70.4	64.7
Income tax provision	21.4	53.2
EBITDA	219.1	311.5
Stock-based compensation expense	7.2	8.6
Pre-opening expense	8.3	3.2
Other expenses, net	0.2	3.7
Transaction expense, net	4.1	(0.2)
Interest, depreciation and amortization expense related to equity investments	10.3	9.8
Other charges and recoveries, net	(6.7)	0.3
Gain on sale of Arlington	0.0	(114.0)
Total adjustments to EBITDA	23.4	(88.6)
Adjusted EBITDA	242.5	222.9
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	263.2	241.0
All Other
Segment Reporting Information [Line Items]
Adjusted EBITDA	(20.7)	(18.1)
Live and Historical | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	100.8	82.1
TwinSpires | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	39.6	29.4
Gaming | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 122.8	$ 129.5