Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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Amount of fair value of reporting unit in excess of carrying amount.

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Asset Impairment (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
Asset Impairment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]
Asset impairments				$ 15.3	$ 17.5	$ 0.0
TwinSpires
Indefinite-lived Intangible Assets [Line Items]
Asset impairments	$ 4.1
Live and Historical Racing
Indefinite-lived Intangible Assets [Line Items]
Asset impairments		$ 11.2
Presque Isle
Indefinite-lived Intangible Assets [Line Items]
Fair value			$ 62.6
Presque Isle \| Gaming Segment
Indefinite-lived Intangible Assets [Line Items]
Asset impairments			12.5
Gaming rights \| Presque Isle
Indefinite-lived Intangible Assets [Line Items]
Carrying value			77.6
Asset impairments			15.0
Gaming rights \| Presque Isle \| TwinSpires
Indefinite-lived Intangible Assets [Line Items]
Asset impairments			2.5
Trademarks \| Presque Isle
Indefinite-lived Intangible Assets [Line Items]
Asset impairments			$ 2.5