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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Jan. 11, 2019 | Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 363.8 |  | $ 338.0
Goodwill additions | 25.8 |  |
Indefinite-lived intangible assets | 328.2 |  | $ 246.0
Racing Segment |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | 51.7 |  |
Churchill Downs |  |  |
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 |  | $ 25.8 |
Goodwill additions | 25.8 |  |
Gaming Rights | Presque Isle |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 56.0 |  |
Trademarks | Presque Isle |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 15.2 |  |
Gaming | Gaming Rights |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 3.0 |  |
Online Wagering | Gaming Rights |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | $ 8.0 |  |

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