Segment Information - Summary of Capital Expenditures (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	$ 167.1	$ 29.6
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	166.2	28.2
Operating Segments | Live and Historical Racing
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	119.8	16.9
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	6.0	4.8
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	40.4	6.5
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	$ 0.9	$ 1.4