Basis Of Presentation (Details) $ in Millions		3 Months Ended
Jan. 09, 2018 USD ($)	Mar. 31, 2018 USD ($) d	Mar. 31, 2017 USD ($) d
Variable Interest Entity [Line Items]
Proceeds from Divestiture of Businesses		$ 970.7	$ 0.0
Live Racing Days \| d		54	55
Big Fish Games [Member]
Variable Interest Entity [Line Items]
Proceeds from Divestiture of Businesses	$ 990.0

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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