Segment Information - (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Summary of Segment Information
Intersegment revenues		$ 1,028.1	$ 1,064.2
Segment operating profit (loss)		(24.5)	(23.5)
Restructuring charges		(3.8)	(3.9)
Other expense		(46.6)	(24.0)
Income (loss) from continuing operations before taxes		(71.1)	(47.5)
Eurasia Banking
Summary of Segment Information
Intersegment revenues		382.6	435.1
Americas Banking
Summary of Segment Information
Intersegment revenues		362.7	333.7
Retail
Summary of Segment Information
Intersegment revenues		282.8	295.4
Operating Segments [Member]
Summary of Segment Information
Revenue from Related Parties		57.4	36.5
Segment operating profit (loss)		60.3	34.7
Operating Segments [Member] | Eurasia Banking
Summary of Segment Information
Intersegment revenues		382.6	435.1
Revenue from Related Parties		55.2	31.0
Segment operating profit (loss)		33.7	19.5
Operating Segments [Member] | Americas Banking
Summary of Segment Information
Intersegment revenues		362.7	333.7
Revenue from Related Parties		2.2	5.5
Segment operating profit (loss)		18.5	5.0
Operating Segments [Member] | Retail
Summary of Segment Information
Intersegment revenues		282.8	295.4
Segment operating profit (loss)		8.1	10.2
Corporate and Reconciling Items [Member]
Summary of Segment Information
Segment operating profit (loss)		(84.8)	(58.2)
Corporate
Summary of Segment Information
Segment operating profit (loss)	[1]	(33.2)	(17.1)
Segment Reconciling Items [Member]
Summary of Segment Information
Restructuring charges		(3.8)	(3.9)
Net non-routine expense		$ (47.8)	$ (37.2)

[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.