Segment Information - Summary of Capital Expenditures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	$ 55.5	$ 12.3
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	55.1	11.8
Operating Segments | Live and Historical Racing
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	44.5	7.8
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	3.1	2.4
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	7.5	1.6
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	$ 0.4	$ 0.5