Segment Information Segment Information By Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ (958.2)	$ (995.2)	$ (2,845.6)	$ (2,796.4)
Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(323.5)	(364.2)	(977.3)	(1,012.4)
Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(346.6)	(368.5)	(970.8)	(1,044.6)
Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(288.1)	(262.5)	(897.5)	(739.4)
Service [Member]
Segment Reporting Information [Line Items]
Revenues	(561.7)	(588.9)	(1,722.0)	(1,736.4)
Service [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(183.0)	(198.5)	(564.4)	(597.1)
Service [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(231.6)	(247.8)	(691.5)	(721.7)
Service [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(147.1)	(142.6)	(466.1)	(417.6)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	(396.5)	(406.3)	(1,123.6)	(1,060.0)
Product [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(140.5)	(165.7)	(412.9)	(415.3)
Product [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(115.0)	(120.7)	(279.3)	(322.9)
Product [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	$ (141.0)	$ (119.9)	$ (431.4)	$ (321.8)