Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,273.5		$ 6,206.8
Property, Plant and Equipment, Additions	134.7	$ 55.5
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,538.6		5,457.5
Property, Plant and Equipment, Additions	132.1	55.1
Operating Segments | Live and Historical
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,440.5		3,345.4
Property, Plant and Equipment, Additions	108.4	44.5
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	279.6		287.9
Property, Plant and Equipment, Additions	3.0	3.1
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,818.5		1,824.2
Property, Plant and Equipment, Additions	20.7	7.5
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	734.9		$ 749.3
Property, Plant and Equipment, Additions	$ 2.6	$ 0.4