Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales
Net sales	$ 958.2	$ 995.2	$ 2,845.6	$ 2,796.4
Cost of sales
Total cost of sales	698.1	711.1	2,060.4	2,037.9
Gross profit	260.1	284.1	785.2	758.5
Selling and administrative expense	195.5	226.0	603.7	629.7
Research, development and engineering expense	25.6	30.2	95.3	93.4
Asset Impairment Charges	0.3	4.1	0.3	4.1
(Gain) loss on sale of assets, net	0.0	0.0	(1.9)	13.0
Total operating expense	221.4	260.3	697.4	740.2
Operating profit (loss)	38.7	23.8	87.8	18.3
Other income (expense)
Interest income	1.0	1.9	5.0	5.4
Interest expense	(51.3)	(144.3)	(149.7)	(240.6)
Foreign exchange gain (loss), net	4.4	(2.3)	0.9	(9.5)
Miscellaneous, net	4.6	(1.5)	6.6	4.1
Loss before taxes	(2.6)	(122.4)	(49.4)	(222.3)
Income tax (benefit) expense	(1.1)	(21.5)	(11.1)	(4.9)
Equity in loss of unconsolidated subsidiaries	(0.5)	0.0	(2.1)	0.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	(2.0)	(100.9)	(40.4)	(217.4)
Net income/(loss) attributable to noncontrolling interests	0.1	0.5	0.1	0.5
Net loss attributable to Diebold Nixdorf, Incorporated	$ (2.1)	$ (101.4)	$ (40.5)	$ (217.9)
Weighted-average number of common shares used in basic and diluted loss per share (1)	78.3	77.7	78.2	77.5
Earnings Per Share [Abstract]
Basic and diluted loss per share	$ (0.03)	$ (1.31)	$ (0.52)	$ (2.81)
Service [Member]
Net sales
Net sales	$ 561.7	$ 588.9	$ 1,722.0	$ 1,736.4
Cost of sales
Total cost of sales	382.5	399.2	1,182.0	1,226.5
Product [Member]
Net sales
Net sales	396.5	406.3	1,123.6	1,060.0
Cost of sales
Total cost of sales	315.6	311.9	878.4	811.4
Retained Earnings [Member]
Other income (expense)
Net loss attributable to Diebold Nixdorf, Incorporated	$ (2.1)	$ (101.4)	$ (40.5)	$ (217.9)