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