Equity (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Balance	$ (811.7)	$ (708.5)	$ (710.6)	$ (389.3)	$ (268.1)	$ (238.8)	$ (811.7)	$ (389.3)
Net loss attributable to Diebold Nixdorf, Incorporated	(101.4)			(35.7)			(217.9)	(218.7)
Net loss	(100.9)	(23.1)	(93.4)	(34.8)	(55.3)	(131.9)	(217.4)	(222.0)
Other comprehensive loss	(5.7)	45.1	(105.5)	(91.9)	16.1	0.8	(66.1)	(74.2)
Share-based compensation issued	(0.1)	0.0	0.0	0.0	0.0	0.0
Share-based compensation expense	3.5	3.6	4.0	5.3	4.8	9.3
Treasury shares	0.0	(0.1)	(4.6)	0.0	(0.3)	(1.1)
Reclassification of guaranteed dividend to accrued liabilities	0.0	0.0	0.0	0.0	5.6	(0.6)
Reclassifications of redeemable noncontrolling interest	0.0	0.0	0.0	0.2	(0.2)	10.6
Divestitures, net	0.0	(23.4)	(4.8)	0.0	0.0	(3.0)
Balance	(708.5)	(710.6)	(506.3)	(268.1)	(238.8)	(122.9)	(506.3)	(122.9)
Common Stock [Member]
Balance	116.9	116.9	116.7	115.2	115.2	114.9	116.9	115.2
Share-based compensation issued	0.0	0.2	1.4	0.0	0.3	0.7
Balance	116.9	116.7	115.3	115.2	114.9	114.2	115.3	114.2
Additional Paid-in Capital [Member]
Balance	783.3	779.9	776.5	770.8	765.3	761.0	783.3	770.8
Share-based compensation issued	(0.1)	(0.2)	(1.4)	0.0	(0.3)	(0.7)
Share-based compensation expense	3.5	3.6	4.0	5.3	4.8	9.3
Reclassifications of redeemable noncontrolling interest				0.2	(0.2)	10.6
Balance	779.9	776.5	773.9	765.3	761.0	741.8	773.9	741.8
Retained Earnings [Member]
Balance	(690.2)	(588.8)	(565.1)	(349.7)	(314.0)	(263.7)	(690.2)	(349.7)
Net loss attributable to Diebold Nixdorf, Incorporated	(101.4)	(23.7)	(92.8)	(35.7)	(50.3)	(132.7)	(217.9)	(218.7)
Balance	(588.8)	(565.1)	(472.3)	(314.0)	(263.7)	(131.0)	(472.3)	(131.0)
Treasury Stock [Member]
Balance	(576.6)	(576.6)	(576.5)	(571.8)	(571.8)	(571.5)	(576.6)	(571.8)
Treasury shares	0.0	(0.1)	(4.6)	0.0	(0.3)	(1.1)
Balance	(576.6)	(576.5)	(571.9)	(571.8)	(571.5)	(570.4)	(571.9)	(570.4)
AOCI Attributable to Parent
Balance	(440.0)	(434.4)	(479.5)	(378.5)	(287.6)	(306.2)	(440.0)	(378.5)
Other comprehensive loss	(5.6)	45.1	(104.2)	(90.9)	18.6	(1.9)
Balance	(434.4)	(479.5)	(375.3)	(287.6)	(306.2)	(304.3)	(375.3)	(304.3)
Parent [Member]
Balance	(806.6)	(703.0)	(727.9)	(414.0)	(292.9)	(265.5)	(806.6)	(414.0)
Net loss attributable to Diebold Nixdorf, Incorporated	(101.4)	(23.7)	(92.8)	(35.7)	(50.3)	(132.7)
Other comprehensive loss	(5.6)	45.1	(104.2)	(90.9)	18.6	(1.9)
Share-based compensation issued	(0.1)			0.0	0.0	0.0
Share-based compensation expense	3.5	3.6	4.0	5.3	4.8	9.3
Treasury shares	0.0	(0.1)	(4.6)	0.0	(0.3)	(1.1)
Reclassification of guaranteed dividend to accrued liabilities				0.0	0.0	0.0
Reclassifications of redeemable noncontrolling interest				0.2	(0.2)	10.6
Divestitures, net				0.0	0.0	0.0
Balance	(703.0)	(727.9)	(530.3)	(292.9)	(265.5)	(149.7)	(530.3)	(149.7)
Noncontrolling Interest [Member]
Balance	(5.1)	(5.5)	17.3	24.7	24.8	26.7	(5.1)	24.7
Net loss	0.5	0.6	(0.6)	0.9	(5.0)	0.8
Other comprehensive loss	(0.1)	0.0	(1.3)	(1.0)	(2.5)	2.7
Reclassification of guaranteed dividend to accrued liabilities				0.0	5.6	(0.6)
Reclassifications of redeemable noncontrolling interest				0.0	0.0	0.0
Divestitures, net	0.0	(23.4)	(4.8)	0.0	0.0	(3.0)
Balance	$ (5.5)	$ 17.3	$ 24.0	$ 24.8	$ 26.7	$ 26.8	$ 24.0	$ 26.8