Segment Information - Revenue by Service/Product Solution (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer [Line Items]
Net Sales			100.00%	100.00%
Revenues	$ 1,150.2	$ 1,105.6	$ 2,178.3	$ 2,169.8
Eurasia Banking
Revenue from External Customer [Line Items]
Revenues	430.2	437.5	812.8	872.6
Americas Banking
Revenue from External Customer [Line Items]
Revenues	419.9	370.6	782.6	704.3
Retail
Revenue from External Customer [Line Items]
Revenues	300.1	297.5	582.9	592.9
Service [Member]
Revenue from External Customer [Line Items]
Revenues	659.3	692.6	1,288.0	1,382.9
Service [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Revenues	251.2	275.5	498.2	554.7
Service [Member] | Americas Banking
Revenue from External Customer [Line Items]
Revenues	252.6	258.7	493.4	509.8
Service [Member] | Retail
Revenue from External Customer [Line Items]
Revenues	155.5	158.4	296.4	318.4
Product [Member]
Revenue from External Customer [Line Items]
Revenues	490.9	413.0	890.3	786.9
Product [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Revenues	179.0	162.0	314.6	317.9
Product [Member] | Americas Banking
Revenue from External Customer [Line Items]
Revenues	167.3	111.9	289.2	194.5
Product [Member] | Retail
Revenue from External Customer [Line Items]
Revenues	$ 144.6	$ 139.1	$ 286.5	$ 274.5
Transferred at Point in Time [Member]
Revenue from External Customer [Line Items]
Net Sales			41.00%	36.00%
Transferred over Time [Member]
Revenue from External Customer [Line Items]
Net Sales			59.00%	64.00%