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.

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

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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