Segment Information - Revenue by Service/Product Solution (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from External Customer [Line Items]
Net Sales			100.00%	100.00%
Net sales	$ 1,078.8	$ 1,119.0	$ 3,257.1	$ 3,288.8
Eurasia Banking
Revenue from External Customer [Line Items]
Net sales	405.2	434.3	1,218.0	1,306.9
Americas Banking
Revenue from External Customer [Line Items]
Net sales	403.7	382.5	1,186.3	1,086.8
Retail
Revenue from External Customer [Line Items]
Net sales	269.9	302.2	852.8	895.1
Service [Member]
Revenue from External Customer [Line Items]
Net sales	643.0	679.7	1,931.0	2,062.6
Service [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Net sales	241.8	271.0	740.0	825.7
Service [Member] | Americas Banking
Revenue from External Customer [Line Items]
Net sales	252.6	255.5	746.0	765.3
Service [Member] | Retail
Revenue from External Customer [Line Items]
Net sales	148.6	153.2	445.0	471.6
Product [Member]
Revenue from External Customer [Line Items]
Net sales	435.8	439.3	1,326.1	1,226.2
Product [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Net sales	163.4	163.3	478.0	481.2
Product [Member] | Americas Banking
Revenue from External Customer [Line Items]
Net sales	151.1	127.0	440.3	321.5
Product [Member] | Retail
Revenue from External Customer [Line Items]
Net sales	$ 121.3	$ 149.0	$ 407.8	$ 423.5
Transferred at Point in Time [Member]
Revenue from External Customer [Line Items]
Net Sales			41.00%	37.00%
Transferred over Time [Member]
Revenue from External Customer [Line Items]
Net Sales			59.00%	63.00%