Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,750.5		$ 6,206.8
Capital expenditures	498.1	$ 263.7
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,047.7		5,457.5
Capital expenditures	490.8	249.7
Operating Segments | Live and Historical Racing
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,742.1		3,345.4
Capital expenditures	358.3	177.4
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	461.4		287.9
Capital expenditures	12.0	9.3
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,844.2		1,824.2
Capital expenditures	120.5	63.0
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	702.8		$ 749.3
Capital expenditures	$ 7.3	$ 14.0