Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	9 Months Ended
Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 723.8
Additions	177.1
Adjustments	(1.0)
Goodwill, Ending Balance	899.9
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1.0
Additions	0.0
Adjustments	(1.0)
Goodwill, Ending Balance	0.0
Live and Historical Racing \| Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	280.3
Additions	95.9
Adjustments	0.0
Goodwill, Ending Balance	376.2
TwinSpires \| Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	152.2
Additions	81.2
Adjustments	0.0
Goodwill, Ending Balance	233.4
Gaming \| Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	290.3
Additions	0.0
Adjustments	0.0
Goodwill, Ending Balance	$ 290.3

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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