Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 7,172.5		$ 6,955.5
Capital expenditures:	417.6	$ 498.1
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,465.7		6,267.7
Capital expenditures:	407.3	490.8
Operating Segments | Live and Historical Racing
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,068.7		3,872.9
Capital expenditures:	287.7	358.3
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	465.6		473.9
Capital expenditures:	14.2	12.0
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,931.4		1,920.9
Capital expenditures:	105.4	120.5
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	706.8		$ 687.8
Capital expenditures:	$ 10.3	$ 7.3