Segment Information Segment Information By Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ (995.2)	$ (1,078.8)	$ (2,796.4)	$ (3,257.1)
Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(364.2)	(405.2)	(1,012.4)	(1,218.0)
Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(368.5)	(403.7)	(1,044.6)	(1,186.3)
Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(262.5)	(269.9)	(739.4)	(852.8)
Service [Member]
Segment Reporting Information [Line Items]
Revenues	(588.9)	(643.0)	(1,736.4)	(1,931.0)
Service [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(198.5)	(241.8)	(597.1)	(740.0)
Service [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(247.8)	(252.6)	(721.7)	(746.0)
Service [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(142.6)	(148.6)	(417.6)	(445.0)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	(406.3)	(435.8)	(1,060.0)	(1,326.1)
Product [Member] | Eurasia Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(165.7)	(163.4)	(415.3)	(478.0)
Product [Member] | Americas Banking Segment [Member]
Segment Reporting Information [Line Items]
Revenues	(120.7)	(151.1)	(322.9)	(440.3)
Product [Member] | Retail Segment [Member]
Segment Reporting Information [Line Items]
Revenues	$ (119.9)	$ (121.3)	$ (321.8)	$ (407.8)