Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 6,206.8	$ 2,981.6
Capital expenditures	423.5	91.8	$ 234.2
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	5,457.5	1,975.6
Capital expenditures	406.4	89.0	231.6
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	749.3	1,006.0
Capital expenditures	17.1	2.8	2.6
Live and Historical Racing | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,345.4	682.7
Capital expenditures	307.0	60.1	213.3
TwinSpires | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	287.9	289.6
Capital expenditures	87.6	18.6	6.7
Gaming | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,824.2	1,003.3
Capital expenditures	$ 11.8	$ 10.3	$ 11.6