Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income (loss) used in basic and diluted loss per share
Net loss	$ (8.1)	$ (93.4)
Net (income) loss attributable to noncontrolling interests	0.0	(0.6)
Net loss attributable to Diebold Nixdorf, Incorporated	$ (8.1)	$ (92.8)
Denominator
Weighted-average number of common shares used in basic and diluted loss per share (1)	78.0	77.2
Net loss attributable to Diebold Nixdorf, Incorporated
Basic and diluted loss per share	$ (0.10)	$ (1.20)
Anti-dilutive shares
Incremental Shares Excluded From Dilutive Calculation Due To Resulting in Operating Loss	1.3	3.1
Anti-dilutive Shares Not Used In Calculating Diluted Weighted Average Shares	1.6	2.8