Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,981.6	$ 2,686.4
Capital expenditures	91.8	234.2	$ 131.2
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,957.8	1,870.6
Capital expenditures	87.8	231.5	124.5
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,023.8	815.8
Capital expenditures	4.0	2.7	6.7
Live and Historical Racing | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	682.7	663.1
Capital expenditures	60.1	213.3	77.7
TwinSpires | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	271.8	257.2
Capital expenditures	17.4	6.6	9.7
Gaming Segment | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,003.3	950.3
Capital expenditures	$ 10.3	$ 11.6	$ 37.1