Acquisitions and Divestitures - Sunwin Services Group (Details) £ in Millions, $ in Millions		12 Months Ended
Nov. 03, 2014 GBP (£) item	Nov. 03, 2014 USD ($) item	Dec. 31, 2017 item
Acquisitions and Divestitures
Number of ATMs operated by entity			230,000
Sunwin Services Group
Acquisitions and Divestitures
Purchase consideration	£ 41.5	$ 66.4
Number of ATMs operated by entity	2,000	2,000

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration