Segment Information Segment Information By Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Document Period End Date	Mar. 31, 2020
Revenues	$ (910.7)	$ (1,028.1)
Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(310.5)	(382.6)
Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(344.7)	(362.7)
Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(255.5)	(282.8)
Service [Member]
Segment Reporting Information [Line Items]
Revenues	(587.8)	(628.7)
Service [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(206.0)	(247.0)
Service [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(239.5)	(240.8)
Service [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(142.3)	(140.9)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	(322.9)	(399.4)
Product [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(104.5)	(135.6)
Product [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(105.2)	(121.9)
Product [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	$ (113.2)	$ (141.9)