Segment Information - Revenue by Service/Product Solution (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Services and software	$ 711.7	$ 683.6
Systems	352.5	419.2
Total net sales	1,064.2	1,102.8
Banking [Member]
Revenue from External Customer [Line Items]
Services and software	548.8	545.9
Systems	219.9	273.7
Total net sales	768.7	819.6
Retail [Member]
Revenue from External Customer [Line Items]
Services and software	162.9	137.7
Systems	132.6	145.5
Total net sales	295.5	283.2
Americas [Member]
Revenue from External Customer [Line Items]
Services and software	270.3	278.9
Systems	75.4	117.3
Total net sales	345.7	396.2
EMEA [Member]
Revenue from External Customer [Line Items]
Services and software	354.2	317.6
Systems	236.8	244.4
Total net sales	591.0	562.0
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Services and software	87.2	87.1
Systems	40.3	57.5
Total net sales	$ 127.5	$ 144.6

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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