Revenue from Contract with Customer (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Services and software	$ 716.3	$ 687.9	$ 1,428.0	$ 1,371.5
Products	$ 389.3	$ 446.0	$ 741.8	$ 865.2
Net sales	100.00%	100.00%	100.00%	100.00%
Total net sales	$ 1,105.6	$ 1,133.9	$ 2,169.8	$ 2,236.7
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	37.00%	41.00%	36.00%	41.00%
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	63.00%	59.00%	64.00%	59.00%
Operating Segments [Member] \| Eurasia Banking
Disaggregation of Revenue [Line Items]
Services and software	$ 285.0	$ 281.4	$ 572.9	$ 552.0
Products	152.5	192.1	299.7	359.5
Total net sales	437.5	473.5	872.6	911.5
Operating Segments [Member] \| Americas Banking
Disaggregation of Revenue [Line Items]
Services and software	269.0	259.6	530.0	535.1
Products	101.6	110.8	174.3	216.9
Total net sales	370.6	370.4	704.3	752.0
Operating Segments [Member] \| Retail
Disaggregation of Revenue [Line Items]
Services and software	162.3	146.9	325.1	284.4
Products	135.2	143.1	267.8	288.8
Total net sales	$ 297.5	$ 290.0	$ 592.9	$ 573.2

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+ References

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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))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ 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(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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