Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales
Net sales	$ 943.9	$ 910.7
Cost of sales
Total cost of sales	670.7	683.9
Gross profit	273.2	226.8
Selling and administrative expense	203.4	222.1
Research, development and engineering expense	34.1	32.5
(Gain) loss on sale of assets, net	(0.5)	(1.8)
Total operating expense	237.0	252.8
Operating profit (loss)	36.2	(26.0)
Other income (expense)
Interest income	1.7	1.1
Interest expense	(48.7)	(48.0)
Foreign exchange gain, net	5.7	0.4
Miscellaneous, net	(0.7)	(0.9)
Loss before taxes	(5.8)	(73.4)
Income tax expense	1.2	20.0
Equity in (loss) earnings of unconsolidated subsidiaries	(1.1)	0.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	(8.1)	(93.4)
Net (loss) income attributable to noncontrolling interests	0.0	(0.6)
Net loss attributable to Diebold Nixdorf, Incorporated	$ (8.1)	$ (92.8)
Weighted-average number of common shares used in basic and diluted loss per share (1)	78.0	77.2
Earnings Per Share [Abstract]
Basic and diluted loss per share	$ (0.10)	$ (1.20)
Service [Member]
Net sales
Net sales	$ 573.6	$ 587.8
Cost of sales
Total cost of sales	389.6	437.5
Product [Member]
Net sales
Net sales	370.3	322.9
Cost of sales
Total cost of sales	281.1	246.4
Retained Earnings [Member]
Other income (expense)
Net loss attributable to Diebold Nixdorf, Incorporated	$ (8.1)	$ (92.8)