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Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 723.8
Adjustments	0.3
Goodwill, Ending Balance	724.1
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1.0
Adjustments	0.0
Goodwill, Ending Balance	1.0
Live and Historical \| Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	280.3
Adjustments	0.3
Goodwill, Ending Balance	280.6
TwinSpires \| Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	152.2
Adjustments	0.0
Goodwill, Ending Balance	152.2
Gaming \| Operating Segments
Goodwill [Roll Forward]
Goodwill, Beginning Balance	290.3
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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