Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Balance	$ (840.0)	$ (710.6)
Net loss attributable to Diebold Nixdorf, Incorporated	(8.1)	(92.8)
Net loss	(8.1)	(93.4)
Other comprehensive loss	(30.4)	(105.5)
Share-based compensation issued	0.0	0.0
Share-based compensation expense	3.5	4.0
Treasury shares	(5.2)	(4.6)
Reclassifications of redeemable noncontrolling interest	31.9
Divestitures, net		(4.8)
Balance	(831.7)	(506.3)	$ (506.3)
Common Stock [Member]
Balance	118.0	116.7
Share-based compensation issued	1.1	1.4
Balance	116.9	115.3	115.3
Additional Paid-in Capital [Member]
Balance	809.5	776.5
Share-based compensation issued	(1.1)	(1.4)
Share-based compensation expense	3.5	4.0
Reclassifications of redeemable noncontrolling interest	19.2
Balance	787.9	773.9	773.9
Retained Earnings [Member]
Balance	(750.4)	(565.1)
Net loss attributable to Diebold Nixdorf, Incorporated	(8.1)	(92.8)
Balance	(742.3)	(472.3)	(472.3)
Treasury Stock [Member]
Balance	(581.9)	(576.5)
Treasury shares	(5.2)	(4.6)
Balance	(576.7)	(571.9)	(571.9)
AOCI Attributable to Parent
Balance	(443.8)	(479.5)
Other comprehensive loss	(30.9)		(104.2)
Balance	(412.9)	(375.3)	(375.3)
Parent [Member]
Balance	(848.6)	(727.9)
Net loss attributable to Diebold Nixdorf, Incorporated	(8.1)	(92.8)
Other comprehensive loss	(30.9)	(104.2)
Share-based compensation issued		0.0
Share-based compensation expense	3.5	4.0
Treasury shares	(5.2)	(4.6)
Reclassifications of redeemable noncontrolling interest	19.2
Divestitures, net		0.0
Balance	(827.1)	(530.3)	(530.3)
Noncontrolling Interest [Member]
Balance	8.6	17.3
Net loss	0.0	(0.6)
Other comprehensive loss	0.5	(1.3)
Reclassifications of redeemable noncontrolling interest	12.7
Divestitures, net		(4.8)
Balance	$ (4.6)	$ 24.0	$ 24.0