Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Litigation (Details) - USD ($) $ in Millions		1 Months Ended
Litigation (Details) - USD ($) $ in Millions	Apr. 25, 2018	Apr. 30, 2015	Jun. 30, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual			$ 29.1	$ 4.7
Contractual penalty			$ 14.0
Shuffle Tech Matter
Loss Contingencies [Line Items]
Damages sought		$ 100.0
Shuffle Tech Matter \| Minimum
Loss Contingencies [Line Items]
Damages sought	$ 105.2
Shuffle Tech Matter \| Maximum
Loss Contingencies [Line Items]
Damages sought	$ 139.5