Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net revenue:
Total net revenue	$ 2,461.7	$ 1,809.8	$ 1,597.2
Operating expense:
Selling, general and administrative expense	202.3	164.2	138.5
Asset impairments	24.6	38.3	15.3
Transaction expense, net	4.8	42.1	7.9
Total operating expense	1,897.7	1,488.0	1,312.8
Operating income	564.0	321.8	284.4
Other (expense) income:
Interest expense, net	(268.4)	(147.3)	(84.7)
Equity in income of unconsolidated affiliates	146.3	152.7	143.2
Gain on the sale of assets	114.0	274.6	0.0
Miscellaneous, net	5.9	7.0	0.7
Total other (expense) income	(2.2)	287.0	59.2
Income before provision for income taxes	561.8	608.8	343.6
Income tax provision	(144.5)	(169.4)	(94.5)
Net income	$ 417.3	$ 439.4	$ 249.1
Net income per common share - basic (in dollars per share)	$ 5.55	$ 5.79	$ 3.22
Net income per common share - diluted (in dollars per share)	$ 5.49	$ 5.71	$ 3.18
Weighted average shares outstanding:
Basic (in shares)	75.2	75.9	77.2
Diluted (in shares)	76.1	77.0	78.4
Live and Historical Racing
Net revenue:
Total net revenue	$ 1,047.3	$ 614.6	$ 409.1
Operating expense:
Operating expense	662.2	400.9	288.9
TwinSpires
Net revenue:
Total net revenue	444.9	436.4	451.4
Operating expense:
Operating expense	288.2	293.6	345.8
Gaming
Net revenue:
Total net revenue	968.6	755.9	695.4
Operating expense:
Operating expense	700.0	537.9	476.3
All Other
Net revenue:
Total net revenue	0.9	2.9	41.3
Operating expense:
Operating expense	$ 15.6	$ 11.0	$ 40.1