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Goodwill - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Additions |  | $ 20.4 | $ 16.1
Casino |  |  |
Goodwill [Line Items] |  |  |
Additions | $ 20.4 | 20.4 | 0.0
Online Wagering |  |  |
Goodwill [Line Items] |  |  |
Additions |  | 0.0 | 16.1
Ocean Downs and Racing Services | Casino |  |  |
Goodwill [Line Items] |  |  |
Additions |  | $ 20.4 |
BetAmerica Corporation | Online Wagering |  |  |
Goodwill [Line Items] |  |  |
Additions |  |  | $ 16.1

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition 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. + References No definition available. + Details
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- Details
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