Goodwill - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Aug. 22, 2023	Nov. 01, 2022	Sep. 26, 2022	Dec. 31, 2021
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 899.9	$ 723.8				$ 366.8
Additions	177.1	357.0
Gaming | Operating Segments
Indefinite-lived Intangible Assets [Line Items]
Goodwill	290.3	290.3				161.2
Additions	0.0	129.1
Live and Historical Racing | Operating Segments
Indefinite-lived Intangible Assets [Line Items]
Goodwill	376.2	280.3				52.4
Additions	95.9	227.9
TwinSpires | Operating Segments
Indefinite-lived Intangible Assets [Line Items]
Goodwill	233.4	152.2				$ 152.2
Additions	81.2	$ 0.0
Ellis Park
Indefinite-lived Intangible Assets [Line Items]
Goodwill					$ 9.2
P2E Transaction
Indefinite-lived Intangible Assets [Line Items]
Goodwill				$ 347.8
P2E Transaction | Gaming
Indefinite-lived Intangible Assets [Line Items]
Goodwill				129.1
P2E Transaction | Live and Historical Racing
Indefinite-lived Intangible Assets [Line Items]
Goodwill				$ 218.7
Exacta Systems
Indefinite-lived Intangible Assets [Line Items]
Goodwill	177.1		$ 177.1
Exacta Systems | Live and Historical Racing | Operating Segments
Indefinite-lived Intangible Assets [Line Items]
Additions	95.9
Exacta Systems | TwinSpires | Operating Segments
Indefinite-lived Intangible Assets [Line Items]
Additions	$ 81.2