Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020
Balance	$ (1,008.6)	$ (1,008.6)		$ (840.0)
Net loss attributable to Diebold Nixdorf, Incorporated	(183.1)		$ (8.1)
Net loss	(183.9)	(183.9)	(8.1)	(8.1)
Other comprehensive loss	13.9	13.9	(30.4)	(30.4)
Share-based compensation issued		0.0		0.0
Share-based compensation expense		1.7		3.5
Treasury shares		(3.3)		(5.2)
Reclassifications of redeemable noncontrolling interest				31.9
Balance	(837.0)		(831.7)
Common Stock [Member]
Balance		119.5		118.0
Share-based compensation issued		(1.2)		(1.1)
Balance	118.3		116.9
Additional Paid-in Capital [Member]
Balance		820.1		809.5
Share-based compensation issued		(1.2)		(1.1)
Share-based compensation expense		1.7		3.5
Reclassifications of redeemable noncontrolling interest				19.2
Balance	819.6		787.9
Retained Earnings [Member]
Balance		(1,005.5)		(750.4)
Net loss attributable to Diebold Nixdorf, Incorporated	(183.1)	(183.1)	(8.1)	(8.1)
Balance	(822.4)		(742.3)
Treasury Stock [Member]
Balance		(585.4)		(581.9)
Treasury shares		(3.3)		(5.2)
Balance	(582.1)		(576.7)
AOCI Attributable to Parent
Balance		(365.4)		(443.8)
Other comprehensive loss		13.1		(30.9)
Balance	(378.5)		(412.9)
Parent [Member]
Balance		(1,016.7)		(848.6)
Net loss attributable to Diebold Nixdorf, Incorporated		(183.1)		(8.1)
Other comprehensive loss		13.1		(30.9)
Share-based compensation issued				0.0
Share-based compensation expense		1.7		3.5
Treasury shares		(3.3)		(5.2)
Reclassifications of redeemable noncontrolling interest				19.2
Balance	(845.1)		(827.1)
Noncontrolling Interest [Member]
Balance		8.1		8.6
Net loss		(0.8)		0.0
Other comprehensive loss		$ 0.8		0.5
Reclassifications of redeemable noncontrolling interest				$ (12.7)
Balance	$ 8.1		$ (4.6)