Supplemental Guarantor Information (Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 890.5		$ 1,150.2		$ 1,801.2	$ 2,178.3
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
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)
Income (loss) from continuing operations 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 loss	(23.1)	$ (93.4)	(55.3)	$ (131.9)	(116.5)	(187.2)
Net (income) loss 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)
Comprehensive income (loss)	22.0		(39.2)		(176.9)	(170.3)
Less: comprehensive income (loss) attributable to noncontrolling interests	0.6		(7.5)		(1.3)	(4.0)
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	21.4		(31.7)		(175.6)	(166.3)
Reportable Legal Entities [Member] | Parent Company [Member]
Net sales	276.1		301.6		545.5	597.1
Total cost of sales	190.9		241.3		379.3	484.3
Gross profit	85.2		60.3		166.2	112.8
Selling and administrative expense	86.8		87.7		198.3	171.7
Research, development and engineering expense	5.4		1.5		10.5	2.7
(Gain) loss on sale of assets, net	0.1		0.6		0.1	0.6
Operating expense	92.3		89.8		208.9	175.0
Operating profit (loss)	(7.1)		(29.5)		(42.7)	(62.2)
Other income (expense)
Interest income	0.0		0.4		0.0	1.3
Interest expense	(46.6)		(46.9)		(92.2)	(94.4)
Foreign exchange gain, net	0.7		2.0		(4.1)	0.6
Miscellaneous, net	28.2		8.4		49.9	21.0
Income (loss) from continuing operations before taxes	(24.8)		(65.6)		(89.1)	(133.7)
Income tax (benefit) expense	(14.7)		1.5		(10.3)	42.5
Equity in earnings of unconsolidated subsidiaries	(13.6)		16.8		(37.7)	(6.8)
Net loss	(23.7)		(50.3)		(116.5)	(183.0)
Net (income) loss attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(23.7)		(50.3)		(116.5)	(183.0)
Comprehensive income (loss)	21.4		(31.7)		(175.6)	(166.3)
Less: comprehensive income (loss) attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	21.4		(31.7)		(175.6)	(166.3)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net sales	0.1		(0.1)		0.1	0.0
Total cost of sales	0.1		0.2		0.1	0.4
Gross profit	0.0		(0.3)		0.0	(0.4)
Selling and administrative expense	0.1		1.0		0.3	2.1
Research, development and engineering expense	1.5		8.3		4.3	17.1
(Gain) loss on sale of assets, net	0.0		0.0		0.0	0.0
Operating expense	1.6		9.3		4.6	19.2
Operating profit (loss)	(1.6)		(9.6)		(4.6)	(19.6)
Other income (expense)
Interest income	0.0		0.0		0.0	0.0
Interest expense	0.0		0.0		0.0	0.0
Foreign exchange gain, net	0.0		(0.1)		0.0	(0.1)
Miscellaneous, net	(0.2)		0.5		0.0	0.8
Income (loss) from continuing operations before taxes	(1.8)		(9.2)		(4.6)	(18.9)
Income tax (benefit) expense	(2.4)		(1.5)		(4.4)	(7.9)
Equity in earnings of unconsolidated subsidiaries	0.0		0.0		0.0	(1.0)
Net loss	0.6		(7.7)		(0.2)	(12.0)
Net (income) loss attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	0.6		(7.7)		(0.2)	(12.0)
Comprehensive income (loss)	0.6		(7.7)		(0.2)	(12.0)
Less: comprehensive income (loss) attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	0.6		(7.7)		(0.2)	(12.0)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net sales	697.2		949.0		1,399.0	1,800.3
Total cost of sales	527.8		727.5		1,076.8	1,376.4
Gross profit	169.4		221.5		322.2	423.9
Selling and administrative expense	94.7		135.4		205.1	280.6
Research, development and engineering expense	28.6		31.1		58.6	62.6
(Gain) loss on sale of assets, net	14.7		11.1		12.9	14.5
Operating expense	138.0		177.6		276.6	357.7
Operating profit (loss)	31.4		43.9		45.6	66.2
Other income (expense)
Interest income	2.4		1.8		3.5	3.8
Interest expense	(1.7)		(3.0)		(4.1)	(6.4)
Foreign exchange gain, net	(8.3)		(7.0)		(3.1)	(2.8)
Miscellaneous, net	(14.4)		(9.6)		(37.8)	(21.1)
Income (loss) from continuing operations before taxes	9.4		26.1		4.1	39.7
Income tax (benefit) expense	13.7		9.2		31.3	35.0
Equity in earnings of unconsolidated subsidiaries	0.0		(0.2)		0.0	(0.6)
Net loss	(4.3)		16.7		(27.2)	4.1
Net (income) loss attributable to noncontrolling interests	0.6		(5.0)		0.0	(4.2)
Net loss attributable to Diebold Nixdorf, Incorporated	(4.9)		21.7		(27.2)	8.3
Comprehensive income (loss)	26.9		14.2		(68.8)	(7.7)
Less: comprehensive income (loss) attributable to noncontrolling interests	0.6		(7.5)		(1.3)	(4.0)
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	26.3		21.7		(67.5)	(3.7)
Consolidation, Eliminations [Member]
Net sales	(82.9)		(100.3)		(143.4)	(219.1)
Total cost of sales	(75.9)		(98.0)		(129.4)	(208.1)
Gross profit	(7.0)		(2.3)		(14.0)	(11.0)
Selling and administrative expense	0.0		0.0		0.0	0.0
Research, development and engineering expense	(4.8)		(4.8)		(10.2)	(9.4)
(Gain) loss on sale of assets, net	0.0		0.0		0.0	0.0
Operating expense	(4.8)		(4.8)		(10.2)	(9.4)
Operating profit (loss)	(2.2)		2.5		(3.8)	(1.6)
Other income (expense)
Interest income	0.0		0.0		0.0	0.0
Interest expense	0.0		0.0		0.0	0.0
Foreign exchange gain, net	0.0		0.0		0.0	0.0
Miscellaneous, net	(7.1)		0.3		(6.5)	(2.5)
Income (loss) from continuing operations before taxes	(9.3)		2.8		(10.3)	(4.1)
Income tax (benefit) expense	0.0		0.0		0.0	0.0
Equity in earnings of unconsolidated subsidiaries	13.6		(16.8)		37.7	7.8
Net loss	4.3		(14.0)		27.4	3.7
Net (income) loss attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	4.3		(14.0)		27.4	3.7
Comprehensive income (loss)	(26.9)		(14.0)		67.7	15.7
Less: comprehensive income (loss) attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	$ (26.9)		$ (14.0)		$ 67.7	$ 15.7