Segment Information - (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Summary of Segment Information
Total revenue	$ 829.8	$ 943.9
Operating income (loss) / Segment operating profit	83.4	(36.2)
Asset Impairment Charges	55.2	0.0
Restructuring and DN Now transformation expenses	0.0	(6.0)
Other income (expense)	(48.9)	(42.0)
Income (loss) from continuing operations before taxes	(132.3)	(5.8)
Eurasia Banking
Summary of Segment Information
Total revenue	277.9	327.8
Americas Banking
Summary of Segment Information
Total revenue	284.8	311.7
Retail
Summary of Segment Information
Total revenue	267.1	304.4
Operating Segments [Member]
Summary of Segment Information
Intersegment revenue	43.0	30.7
Operating income (loss) / Segment operating profit	(17.3)	(92.3)
Operating Segments [Member] | Eurasia Banking
Summary of Segment Information
Total revenue	277.9	327.8
Intersegment revenue	39.6	28.5
Operating income (loss) / Segment operating profit	8.5	(25.0)
Operating Segments [Member] | Americas Banking
Summary of Segment Information
Total revenue	284.8	311.7
Intersegment revenue	3.4	2.2
Operating income (loss) / Segment operating profit	(17.2)	(40.2)
Operating Segments [Member] | Retail
Summary of Segment Information
Total revenue	267.1	304.4
Operating income (loss) / Segment operating profit	(8.6)	(27.1)
Corporate and Reconciling Items [Member]
Summary of Segment Information
Reconciliation Of Operating Profit Loss From Segments To Consolidated, Amount	(100.7)	(56.1)
Corporate
Summary of Segment Information
Operating income (loss) / Segment operating profit	(24.6)	(13.3)
Segment Reconciling Items [Member]
Summary of Segment Information
Asset Impairment Charges	55.2	0.0
Restructuring and DN Now transformation expenses	0.0	(23.1)
Net non-routine expense	$ (20.9)	$ (19.7)