Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales
Net sales	$ 890.5	$ 1,150.2	$ 1,801.2	$ 2,178.3
Cost of sales
Total cost of sales	642.9	871.0	1,326.8	1,653.0
Gross profit	247.6	279.2	474.4	525.3
Selling and administrative expense	181.6	224.1	403.7	454.4
Research, development and engineering expense	30.7	36.1	63.2	73.0
(Gain) loss on sale of assets, net	14.8	11.7	13.0	15.1
Total operating expense	227.1	271.9	479.9	542.5
Operating profit (loss)	20.5	7.3	(5.5)	(17.2)
Other income (expense)
Interest income	2.4	2.2	3.5	5.1
Interest expense	(48.3)	(49.9)	(96.3)	(100.8)
Foreign exchange gain, net	(7.6)	(5.1)	(7.2)	(2.3)
Miscellaneous, net	6.5	(0.4)	5.6	(1.8)
Loss before taxes	(26.5)	(45.9)	(99.9)	(117.0)
Income tax (benefit) expense	(3.4)	9.2	16.6	69.6
Equity in earnings of unconsolidated subsidiaries	0.0	(0.2)	0.0	(0.6)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	(23.1)	(55.3)	(116.5)	(187.2)
Net (loss) income attributable to noncontrolling interests	0.6	(5.0)	0.0	(4.2)
Net loss attributable to Diebold Nixdorf, Incorporated	$ (23.7)	$ (50.3)	$ (116.5)	$ (183.0)
Weighted-average number of common shares used in basic and diluted loss per share (1)	77.6	76.7	77.4	76.5
Earnings Per Share [Abstract]
Basic and diluted loss per share	$ (0.31)	$ (0.66)	$ (1.51)	$ (2.39)
Service [Member]
Net sales
Net sales	$ 559.7	$ 659.3	$ 1,147.5	$ 1,288.0
Cost of sales
Total cost of sales	389.8	489.4	827.3	960.9
Product [Member]
Net sales
Net sales	330.8	490.9	653.7	890.3
Cost of sales
Total cost of sales	253.1	381.6	499.5	692.1
Retained Earnings [Member]
Other income (expense)
Net loss attributable to Diebold Nixdorf, Incorporated	$ (23.7)	$ (50.3)	$ (116.5)	$ (183.0)