Segment Information (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of Segment Information
Net sales		$ 1,105.9	$ 995.2	$ 890.5	$ 910.7	$ 1,151.6	$ 1,078.8	$ 1,150.2	$ 1,028.1	$ 3,902.3	$ 4,408.7	$ 4,578.6
Segment operating profit										24.0	(26.6)	(325.6)
Impairment of assets										(7.5)	(30.2)	(180.2)
Restructuring and DN Now transformation expenses										(81.6)	(50.2)	(65.0)
Other expense										(293.5)	(202.3)	(152.7)
Income (loss) from continuing operations before taxes										(269.5)	(228.9)	(478.3)
Eurasia Banking Segment [Member]
Summary of Segment Information
Net sales										1,431.1	1,649.8	1,800.2
Americas Banking Segment [Member]
Summary of Segment Information
Net sales										1,419.4	1,604.1	1,515.7
Retail Segment [Member]
Summary of Segment Information
Net sales										1,051.8	1,154.8	1,262.7
Operating Segments [Member]
Summary of Segment Information
Net sales										3,902.3	4,408.7	4,578.6
Revenue from Related Parties										123.1	183.8	174.9
Segment operating profit										446.4	347.3	214.4
Operating Segments [Member] | Eurasia Banking Segment [Member]
Summary of Segment Information
Net sales										1,431.1	1,649.8	1,800.2
Revenue from Related Parties										111.8	168.3	161.1
Segment operating profit										177.8	169.3	150.1
Operating Segments [Member] | Americas Banking Segment [Member]
Summary of Segment Information
Net sales										1,419.4	1,604.1	1,515.7
Revenue from Related Parties										11.3	15.5	13.8
Segment operating profit										191.0	119.7	17.2
Operating Segments [Member] | Retail Segment [Member]
Summary of Segment Information
Net sales										1,051.8	1,154.8	1,262.7
Segment operating profit										77.6	58.3	47.1
Corporate, Non-Segment [Member]
Summary of Segment Information
Corporate charges not allocated back to segments	[1]									(91.0)	(79.4)	(52.1)
Segment Reconciling Items [Member]
Summary of Segment Information
Impairment of assets										(7.5)	(30.2)	(180.2)
Restructuring and Other Transformation Charges										(181.8)	(114.8)	(79.3)
Net non-routine expense										(142.1)	(149.5)	(228.4)
Corporate And Reconciling Items [Member]
Summary of Segment Information
Reconciliation of Operating Profit (Loss) from Segments to Consolidated										$ (422.4)	$ (373.9)	$ (540.0)

[1] Corporate charges not allocated to segments include headquarter-based costs associated with procurement, human resources, compensation and benefits, finance and accounting, global development/engineering, global strategy/mergers and acquisitions, global IT, tax, treasury and legal.