Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020
Income (loss) used in basic and diluted loss per share
Net loss	$ (183.9)	$ (183.9)	$ (8.1)	$ (8.1)
Net income (loss) attributable to noncontrolling interests	(0.8)		0.0
Net loss attributable to Diebold Nixdorf, Incorporated	$ (183.1)		$ (8.1)
Weighted-average number of common shares used in basic and diluted loss per share (1)	78.7		78.0
Basic and diluted loss per share	$ (2.33)		$ (0.10)
Denominator
Weighted-average number of common shares used in basic and diluted loss per share (1)	78.7		78.0
Anti-dilutive shares
Incremental Shares Excluded From Dilutive Calculation Due To Resulting in Operating Loss	1.4		1.3
Anti-dilutive shares not used in calculating diluted weighted-average shares	4.0		1.6