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Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) | $ 169.4 | $ 264.0 | $ 169.4 |
Definite lived intangible assets | 19.2 | 18.0 | 19.2 |
Amortization of definite-lived intangible assets |  | 6.0 | 6.8 | $ 9.4
Additional payments not included in future estimated amortization expense |  | 2.3 |  |
Customer Relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite lived intangible assets | 6.1 | 3.9 | 6.1 |
Other |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite lived intangible assets | 5.6 | 7.2 | 5.6 |
Calder Racing |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets acquired |  | 2.3 | 2.3 |
Gaming rights |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) | 128.9 | 216.4 | 128.9 |
Trademarks |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) | 21.2 | 29.5 | 21.2 |
Illinois Horseracing Equity Trust | Racing |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of indefinite lived intangible assets | 3.3 |  |  |
Ocean Downs and Racing Services | Other |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite lived intangible assets |  | 2.3 |  |
Ocean Downs and Racing Services | Gaming rights |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) |  | 87.0 |  |
Ocean Downs and Racing Services | Trademarks |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) |  | 8.3 |  |
Derby City Gaming | Other |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite lived intangible assets |  | $ 0.1 |  |
BetAmerica Corporation | Customer Relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets acquired |  |  | 4.7 |
BetAmerica Corporation | Other |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 3.4 |
Bluff Media | Online Wagering |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets (excluding goodwill) | 4.7 |  |  |
Bluff Media | Online Wagering | Customer Relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of definite lived intangible assets | 0.2 |  |  |
Bluff Media | Trademarks | Online Wagering |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of indefinite lived intangible assets | $ 4.5 |  |  |

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