Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 7,066.8		$ 6,955.5
Capital expenditures:	155.0	$ 134.7
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,358.5		6,267.7
Capital expenditures:	149.9	132.1
Operating Segments | Live and Historical
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,936.9		3,872.9
Capital expenditures:	84.8	108.4
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	465.1		473.9
Capital expenditures:	3.8	3.0
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,956.5		1,920.9
Capital expenditures:	61.3	20.7
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	708.3		$ 687.8
Capital expenditures:	$ 5.1	$ 2.6