Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales
Net sales	$ 943.5	$ 890.5	$ 1,887.4	$ 1,801.2
Cost of sales
Total cost of sales	691.6	642.9	1,362.3	1,326.8
Gross profit	251.9	247.6	525.1	474.4
Selling and administrative expense	204.8	181.6	408.2	403.7
Research, development and engineering expense	35.6	30.7	69.7	63.2
(Gain) loss on sale of assets, net	(1.4)	14.8	(1.9)	13.0
Total operating expense	239.0	227.1	476.0	479.9
Operating profit (loss)	12.9	20.5	49.1	(5.5)
Other income (expense)
Interest income	2.3	2.4	4.0	3.5
Interest expense	(49.7)	(48.3)	(98.4)	(96.3)
Foreign exchange gain (loss), net	(9.2)	(7.6)	(3.5)	(7.2)
Miscellaneous, net	2.7	6.5	2.0	5.6
Loss before taxes	(41.0)	(26.5)	(46.8)	(99.9)
Income tax (benefit) expense	(11.2)	(3.4)	(10.0)	16.6
Equity in loss of unconsolidated subsidiaries	(0.5)	0.0	(1.6)	0.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	(30.3)	(23.1)	(38.4)	(116.5)
Net (loss) income attributable to noncontrolling interests	0.0	0.6	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	$ (30.3)	$ (23.7)	$ (38.4)	$ (116.5)
Weighted-average number of common shares used in basic and diluted loss per share (1)	78.3	77.6	78.2	77.4
Earnings Per Share [Abstract]
Basic and diluted loss per share	$ (0.39)	$ (0.31)	$ (0.49)	$ (1.51)
Service [Member]
Net sales
Net sales	$ 586.7	$ 559.7	$ 1,160.3	$ 1,147.5
Cost of sales
Total cost of sales	409.9	389.8	799.5	827.3
Product [Member]
Net sales
Net sales	356.8	330.8	727.1	653.7
Cost of sales
Total cost of sales	281.7	253.1	562.8	499.5
Retained Earnings [Member]
Other income (expense)
Net loss attributable to Diebold Nixdorf, Incorporated	$ (30.3)	$ (23.7)	$ (38.4)	$ (116.5)