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Goodwill - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Oct. 09, 2019 | Mar. 31, 2019 | Jan. 11, 2019 | Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 367.1 | $ 338.0 |  |  |  | $ 317.6
Additions | 29.1 | 20.4 |  |  |  |
Churchill Downs |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 51.7 |  |
Churchill Downs Reporting Unit |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | 49.7 |  |
Gaming |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | 1.0 |  |
Arlington Reporting Unit |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 1.0 |  |
Presque Isle |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 26.1 |
Turfway Park |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 3.0 |  |  |
Gaming | Presque Isle |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Additions | 26.1 |  |  |  |  |
Gaming | Turfway Park |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Additions | $ 3.0 |  |  |  |  |
Gaming | Ocean Downs |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Additions |  | $ 20.4 |  |  |  |

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