Segment Information - Schedule of Equity in Income (Losses) of Unconsolidated Investments Included in Reported Segments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	$ 6,955.5	$ 6,206.8
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	6,267.7	5,457.5
All Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	687.8	749.3
Live and Historical Racing | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	3,872.9	3,345.4
TwinSpires | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	473.9	287.9
Gaming | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	$ 1,920.9	$ 1,824.2