Segment Information Segment Information By Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ (890.5)	$ (1,150.2)	$ (1,801.2)	$ (2,178.3)
Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(337.7)	(430.2)	(648.2)	(812.8)
Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(331.4)	(419.9)	(676.1)	(782.6)
Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(221.4)	(300.1)	(476.9)	(582.9)
Service [Member]
Segment Reporting Information [Line Items]
Revenues	(559.7)	(659.3)	(1,147.5)	(1,288.0)
Service [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(192.6)	(251.2)	(398.6)	(498.2)
Service [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(234.4)	(252.6)	(473.9)	(493.4)
Service [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(132.7)	(155.5)	(275.0)	(296.4)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	(330.8)	(490.9)	(653.7)	(890.3)
Product [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(145.1)	(179.0)	(249.6)	(314.6)
Product [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(97.0)	(167.3)	(202.2)	(289.2)
Product [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	$ (88.7)	$ (144.6)	$ (201.9)	$ (286.5)