Equity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance	$ (842.6)	$ (840.0)	$ (708.5)	$ (710.6)	$ (842.6)	$ (708.5)
Net loss attributable to Diebold Nixdorf, Incorporated	(30.3)		(23.7)		(38.4)	(116.5)
Net loss	(30.3)	(8.1)	(23.1)	(93.4)	(38.4)	(116.5)
Other comprehensive loss	23.4	(30.4)	45.1	(105.5)	(7.0)	(60.4)
Share-based compensation issued	0.0	0.0	0.0	0.0
Share-based compensation expense	4.5	3.5	3.6	4.0
Treasury shares	(0.2)	(5.2)	(0.1)	(4.6)
Reclassifications of redeemable noncontrolling interest		31.9
Divestitures, net	0.0		(23.4)	(4.8)
Balance	(840.0)	(831.7)	(710.6)	(506.3)	(831.7)	(506.3)
Common Stock [Member]
Balance	118.2	118.0	116.9	116.7	118.2	116.9
Share-based compensation issued	0.2	1.1	0.2	1.4
Balance	118.0	116.9	116.7	115.3	116.9	115.3
Additional Paid-in Capital [Member]
Balance	813.8	809.5	779.9	776.5	813.8	779.9
Share-based compensation issued	(0.2)	(1.1)	(0.2)	(1.4)
Share-based compensation expense	4.5	3.5	3.6	4.0
Reclassifications of redeemable noncontrolling interest		19.2
Balance	809.5	787.9	776.5	773.9	787.9	773.9
Retained Earnings [Member]
Balance	(780.7)	(750.4)	(588.8)	(565.1)	(780.7)	(588.8)
Net loss attributable to Diebold Nixdorf, Incorporated	(30.3)	(8.1)	(23.7)	(92.8)	(38.4)	(116.5)
Balance	(750.4)	(742.3)	(565.1)	(472.3)	(742.3)	(472.3)
Treasury Stock [Member]
Balance	(582.1)	(581.9)	(576.6)	(576.5)	(582.1)	(576.6)
Treasury shares	(0.2)	(5.2)	(0.1)	(4.6)
Balance	(581.9)	(576.7)	(576.5)	(571.9)	(576.7)	(571.9)
AOCI Attributable to Parent
Balance	(420.5)	(443.8)	(434.4)	(479.5)	(420.5)	(434.4)
Other comprehensive loss	23.3	(30.9)	45.1	(104.2)
Balance	(443.8)	(412.9)	(479.5)	(375.3)	(412.9)	(375.3)
Parent [Member]
Balance	(851.3)	(848.6)	(703.0)	(727.9)	(851.3)	(703.0)
Net loss attributable to Diebold Nixdorf, Incorporated	(30.3)	(8.1)	(23.7)	(92.8)
Other comprehensive loss	23.3	(30.9)	45.1	(104.2)
Share-based compensation issued			0.0	0.0
Share-based compensation expense	4.5	3.5	3.6	4.0
Treasury shares	(0.2)	(5.2)	(0.1)	(4.6)
Reclassifications of redeemable noncontrolling interest		19.2
Divestitures, net			0.0	0.0
Balance	(848.6)	(827.1)	(727.9)	(530.3)	(827.1)	(530.3)
Noncontrolling Interest [Member]
Balance	8.7	8.6	(5.5)	17.3	8.7	(5.5)
Net loss	0.0	0.0	0.6	(0.6)
Other comprehensive loss	0.1	0.5	0.0	(1.3)
Reclassifications of redeemable noncontrolling interest		12.7
Divestitures, net	0.0		(23.4)	(4.8)
Balance	$ 8.6	$ (4.6)	$ 17.3	$ 24.0	$ (4.6)	$ 24.0