Acquisitions (Details) - USD ($) $ in Millions		9 Months Ended
	Aug. 22, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Business Acquisition [Line Items]
Deferred payments for acquisition of business included in other liabilities		$ 1.2	$ 6.9
Goodwill		900.2		$ 899.9
Operating Segments | Live and Historical
Business Acquisition [Line Items]
Goodwill		376.3		376.2
Operating Segments | TwinSpires
Business Acquisition [Line Items]
Goodwill		233.6		$ 233.4
Exacta Systems
Business Acquisition [Line Items]
Total consideration	$ 248.2
Cash payment	241.3
Deferred payments for acquisition of business included in other liabilities	$ 6.9	1.2
Deferred payment term	2 years
Goodwill		177.4
Exacta Systems | Operating Segments | Live and Historical
Business Acquisition [Line Items]
Goodwill additions		96.0
Exacta Systems | Operating Segments | TwinSpires
Business Acquisition [Line Items]
Goodwill additions		$ 81.4