Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 6,955.5	$ 6,206.8
Capital expenditures	676.5	423.5	$ 91.8
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,267.7	5,457.5
Capital expenditures	663.8	406.4	89.0
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	687.8	749.3
Capital expenditures	12.7	17.1	2.8
Live and Historical Racing | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,872.9	3,345.4
Capital expenditures	461.1	307.0	60.1
TwinSpires | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	473.9	287.9
Capital expenditures	14.6	87.6	18.6
Gaming | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,920.9	1,824.2
Capital expenditures	$ 188.1	$ 11.8	$ 10.3