Segment Information - Revenue by Service/Product Solution (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Net Sales			14710.00%
Net sales	$ 943.5	$ 890.5	$ 1,887.4	$ 1,801.2
Eurasia Banking
Revenue from External Customer [Line Items]
Net sales	326.0	337.7	653.8	648.2
Americas Banking Segment [Member]
Revenue from External Customer [Line Items]
Net sales	312.5	331.4	624.2	676.1
Retail
Revenue from External Customer [Line Items]
Net sales	305.0	221.4	609.4	476.9
Service [Member]
Revenue from External Customer [Line Items]
Net sales	586.7	559.7	1,160.3	1,147.5
Service [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Net sales	191.8	192.6	381.4	398.6
Service [Member] | Americas Banking Segment [Member]
Revenue from External Customer [Line Items]
Net sales	232.2	234.4	459.9	473.9
Service [Member] | Retail
Revenue from External Customer [Line Items]
Net sales	162.7	132.7	319.0	275.0
Product [Member]
Revenue from External Customer [Line Items]
Net sales	356.8	330.8	727.1	653.7
Product [Member] | Eurasia Banking
Revenue from External Customer [Line Items]
Net sales	134.2	145.1	272.4	249.6
Product [Member] | Americas Banking Segment [Member]
Revenue from External Customer [Line Items]
Net sales	80.3	97.0	164.3	202.2
Product [Member] | Retail
Revenue from External Customer [Line Items]
Net sales	$ 142.3	$ 88.7	$ 290.4	$ 201.9