Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 366.8
Additions	(8.9)
Goodwill, Ending Balance	375.7
Live and Historical
Goodwill [Roll Forward]
Goodwill, Beginning Balance	52.5
Additions	(8.9)
Goodwill, Ending Balance	61.4
TwinSpires
Goodwill [Roll Forward]
Goodwill, Beginning Balance	152.2
Additions	0.0
Goodwill, Ending Balance	152.2
Gaming
Goodwill [Roll Forward]
Goodwill, Beginning Balance	161.1
Additions	0.0
Goodwill, Ending Balance	161.1
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1.0
Additions	0.0
Goodwill, Ending Balance	$ 1.0