Revenue from Contract with Customer (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Services	$ 583.9	$ 605.8	$ 1,769.6	$ 1,759.3
Products	414.6	397.0	1,156.4	1,262.2
Software	$ 120.5	$ 119.9	$ 362.8	$ 337.9
Net sales	100.00%	100.00%	100.00%	100.00%
Total net sales	$ 1,119.0	$ 1,122.7	$ 3,288.8	$ 3,359.4
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	39.00%	37.00%	37.00%	39.00%
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	61.00%	63.00%	63.00%	61.00%
Operating Segments [Member] | Eurasia Banking
Disaggregation of Revenue [Line Items]
Services	$ 229.8	$ 240.2	$ 702.2	$ 699.8
Products	152.0	167.5	451.7	527.0
Software	52.5	53.4	153.0	145.8
Total net sales	434.3	461.1	1,306.9	1,372.6
Operating Segments [Member] | Americas Banking
Disaggregation of Revenue [Line Items]
Services	237.2	245.8	706.7	729.7
Products	118.0	106.2	292.3	323.1
Software	27.3	24.7	87.8	75.9
Total net sales	382.5	376.7	1,086.8	1,128.7
Operating Segments [Member] | Retail
Disaggregation of Revenue [Line Items]
Services	116.9	119.8	360.7	329.8
Products	144.6	123.3	412.4	412.1
Software	40.7	41.8	122.0	116.2
Total net sales	$ 302.2	$ 284.9	$ 895.1	$ 858.1