Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 899.9
Adjustments	0.3
Goodwill, Ending Balance	900.2
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	0.0
Adjustments	0.0
Goodwill, Ending Balance	0.0
Live and Historical Racing | Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	376.2
Adjustments	0.1
Goodwill, Ending Balance	376.3
TwinSpires | Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	233.4
Adjustments	0.2
Goodwill, Ending Balance	233.6
Gaming | Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	290.3
Adjustments	0.0
Goodwill, Ending Balance	$ 290.3