Segment Information Segment Information By Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ (943.9)	$ (910.7)
Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(327.8)	(310.5)
Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(311.7)	(344.7)
Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(304.4)	(255.5)
Service [Member]
Segment Reporting Information [Line Items]
Revenues	(573.6)	(587.8)
Service [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(189.6)	(206.0)
Service [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(227.7)	(239.5)
Service [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(156.3)	(142.3)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	(370.3)	(322.9)
Product [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(138.2)	(104.5)
Product [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(84.0)	(105.2)
Product [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	$ (148.1)	$ (113.2)