Segment Information Segment Information By Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ (943.5)	$ (890.5)	$ (1,887.4)	$ (1,801.2)
Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(326.0)	(337.7)	(653.8)	(648.2)
Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(312.5)	(331.4)	(624.2)	(676.1)
Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(305.0)	(221.4)	(609.4)	(476.9)
Service [Member]
Segment Reporting Information [Line Items]
Revenues	(586.7)	(559.7)	(1,160.3)	(1,147.5)
Service [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(191.8)	(192.6)	(381.4)	(398.6)
Service [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(232.2)	(234.4)	(459.9)	(473.9)
Service [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(162.7)	(132.7)	(319.0)	(275.0)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	(356.8)	(330.8)	(727.1)	(653.7)
Product [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(134.2)	(145.1)	(272.4)	(249.6)
Product [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(80.3)	(97.0)	(164.3)	(202.2)
Product [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	$ (142.3)	$ (88.7)	$ (290.4)	$ (201.9)