Equity (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Common Stock, Value, Issued	$ 115.2						$ 115.2		$ 114.2
Net loss attributable to Diebold Nixdorf, Incorporated	(35.7)			$ (238.5)			(218.7)	$ (445.1)
Net loss	(34.8)	$ (55.3)	$ (131.9)	(244.6)	$ (128.3)	$ (65.6)	(222.0)	(438.5)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(425.2)	(304.0)	(274.7)	(18.7)	239.4	436.4	(425.2)	(18.7)	(159.6)	$ 482.3
Additional Paid in Capital, Common Stock	770.8						770.8		741.8
Retained Earnings (Accumulated Deficit)	(387.0)						(387.0)		(168.3)
Treasury Stock, Value	(571.8)						(571.8)		(570.4)
Accumulated Other Comprehensive Income (Loss)	(377.1)	(286.2)		(291.5)	(273.5)		(377.1)	(291.5)	(303.7)	(196.3)
Noncontrolling interests	24.7						24.7		26.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent							(73.4)	(95.2)
Other Comprehensive Income Loss, Net Of Tax And Noncontrolling Interest Adjustment	(91.9)	16.1	1.6	(19.5)	(69.5)	(9.2)
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0.0	0.0	0.0		0.0	0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	5.3	4.8	9.3	6.9	6.6	13.7
Dividends, Common Stock, Cash						(7.7)
Adoption of accounting standard						33.6
Treasury shares	0.0	(0.3)	(1.1)	(0.1)	(0.4)	(2.5)
Reclassification Of Temporary Equity To Liability		5.6	(0.6)	5.8	(3.9)	(4.4)
Distributions to noncontrolling interest holders				(2.5)		(0.5)
Reclassification From Noncontrolling Interests To Redeemable Noncontrolling Interests	0.2	(0.2)	10.6	(4.1)
Noncontrolling Interest, Decrease from Deconsolidation			(3.0)		(1.5)	(3.3)
Other Comprehensive Income (Loss), Net of Tax	(91.9)			(19.1)			(74.2)	(97.8)
Common Stock [Member]
Common Stock, Value, Issued									114.2
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	115.2	115.2	114.9	114.1	114.1	113.8	115.2	114.1		113.2
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0.0	0.3	0.7		0.3	0.6
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	770.8	765.3	761.0	743.7	740.9	734.6	770.8	743.7		721.5
Additional Paid in Capital, Common Stock									741.8
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0.0	(0.3)	(0.7)		(0.3)	(0.6)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	5.3	4.8	9.3	6.9	6.6	13.7
Reclassification From Noncontrolling Interests To Redeemable Noncontrolling Interests	0.2	(0.2)	10.6	(4.1)
Retained Earnings [Member]
Net loss attributable to Diebold Nixdorf, Incorporated	(35.7)	(50.3)	(132.7)	(238.5)	(133.4)	(73.2)	(218.7)	(445.1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(387.0)	(351.3)	(301.0)	(44.7)	193.8	327.2	(387.0)	(44.7)		374.5
Retained Earnings (Accumulated Deficit)									(168.3)
Dividends, Common Stock, Cash						(7.7)
Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(571.8)	(571.8)	(571.5)	(570.4)	(570.3)	(569.9)	(571.8)	(570.4)		(567.4)
Treasury Stock, Value									(570.4)
Treasury shares	0.0	(0.3)	(1.1)	0.1	(0.4)	(2.5)
AOCI Attributable to Parent
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(377.1)	(286.2)	(304.8)	(291.5)	(273.5)	(205.5)	(377.1)	(291.5)		(196.3)
Accumulated Other Comprehensive Income (Loss)									(303.7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(90.9)	18.6	(1.1)	(18.0)	(68.0)	(9.2)
Parent [Member]
Net loss attributable to Diebold Nixdorf, Incorporated	(35.7)	(50.3)	(132.7)	(238.5)	(133.4)	(73.2)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(449.9)	(328.8)	(301.4)	(48.8)	205.0	400.2	(449.9)	(48.8)	(186.4)	445.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(90.9)	18.6	(1.1)	(18.0)	(68.0)	(9.2)
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0.0	0.0	0.0		0.0	0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	5.3	4.8	9.3	6.9	6.6	13.7
Dividends, Common Stock, Cash						(7.7)
Treasury shares	0.0	(0.3)	(1.1)	(0.1)	(0.4)	(2.5)
Reclassification Of Temporary Equity To Liability		0.0	0.0	0.0	0.0	0.0
Distributions to noncontrolling interest holders				0.0		0.0
Reclassification From Noncontrolling Interests To Redeemable Noncontrolling Interests	0.2	(0.2)	10.6	(4.1)
Noncontrolling Interest, Decrease from Deconsolidation			0.0		0.0	0.0
Noncontrolling Interest [Member]
Net loss	0.9	(5.0)	0.8	(6.1)	5.1	7.6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	24.7	24.8	26.7	30.1	34.4	36.2	24.7	30.1		$ 36.8
Noncontrolling interests									$ 26.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	(1.0)	(2.5)	2.7	(1.5)	(1.5)	0.0
Reclassification Of Temporary Equity To Liability		5.6	(0.6)	5.8	(3.9)	(4.4)
Distributions to noncontrolling interest holders				2.5		(0.5)
Reclassification From Noncontrolling Interests To Redeemable Noncontrolling Interests		$ 0.0	0.0
Noncontrolling Interest, Decrease from Deconsolidation			$ (3.0)		$ (1.5)	$ (3.3)
Accounting Standards Update 2018-02 | AOCI Attributable to Parent
Adoption of accounting standard	$ 0.0			$ 0.0			$ 0.0	$ (29.0)