Segment Information - Summary of Capital Expenditures (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	$ 263.7	$ 52.1
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	249.7	50.1
Operating Segments | Live and Historical Racing:
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	177.4	32.3
Operating Segments | TwinSpires
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	9.3	8.5
Operating Segments | Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	63.0	9.3
All Other
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	$ 14.0	$ 2.0