Segment Information - Revenue by Service/Product Solution (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Net Sales	100.00%	100.00%
Revenues	$ 1,028.1	$ 1,064.2
Eurasia Banking
Revenue from External Customer [Line Items]
Revenues	382.6	435.1
Americas Banking
Revenue from External Customer [Line Items]
Revenues	362.7	333.7
Retail
Revenue from External Customer [Line Items]
Revenues	282.8	295.4
Service [Member]
Revenue from External Customer [Line Items]
Revenues	628.7	690.3
Service [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Revenues	247.0	279.2
Service [Member] | Americas Banking
Revenue from External Customer [Line Items]
Revenues	240.8	251.2
Service [Member] | Retail
Revenue from External Customer [Line Items]
Revenues	140.9	159.9
Product [Member]
Revenue from External Customer [Line Items]
Revenues	399.4	373.9
Product [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Revenues	135.6	155.9
Product [Member] | Americas Banking
Revenue from External Customer [Line Items]
Revenues	121.9	82.5
Product [Member] | Retail
Revenue from External Customer [Line Items]
Revenues	$ 141.9	$ 135.5
Transferred at Point in Time [Member]
Revenue from External Customer [Line Items]
Net Sales	39.00%	35.00%
Transferred over Time [Member]
Revenue from External Customer [Line Items]
Net Sales	61.00%	65.00%