Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,578.6		$ 6,206.8
Capital expenditures	312.4	$ 167.1
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,643.9		5,457.5
Capital expenditures	308.6	166.2
Operating Segments | Live and Historical
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,552.8		3,345.4
Capital expenditures	239.8	119.8
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	288.3		287.9
Capital expenditures	6.4	6.0
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,802.8		1,824.2
Capital expenditures	62.4	40.4
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	934.7		$ 749.3
Capital expenditures	$ 3.8	$ 0.9