Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Diebold Nixdorf, Incorporated shareholders' equity
Balance at beginning of period	$ 220.4	$ 583.2	$ 464.6		$ 588.7
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(230.4)	(23.1)	(517.9)		15.2
Common shares	0.0	0.0	0.9		0.7
Additional capital	2.7	15.4	22.1		(9.3)
Treasury shares	(0.1)	(0.3)	(3.0)		(4.8)
Dividends paid	0.0	(7.6)	(7.7)		(22.9)
Balance at end of period	(7.4)	567.6	(7.4)		567.6
Noncontrolling interests
Balance at beginning of period	34.1	37.5	36.8		433.4
Comprehensive income (loss) attributable to noncontrolling interests, net	(7.4)	8.4	3.5	[1]	23.7
Reclassification From Noncontrolling Interests To Redeemable Noncontrolling Interests	0.0	0.0	0.0		(386.7)
Minority Interest Decrease From Reclassification of Guaranteed Dividends To Other Current Liabilities	5.8	(6.4)	(2.5)		(18.1)
Distributions to noncontrolling interest holders	0.0	0.0	(0.5)		(12.8)
Liquidation of noncontrolling interests	(2.4)	0.0	(7.2)		0.0
Balance at end of period	30.1	39.5	30.1		39.5
Adjustments for New Accounting Pronouncement [Member] | Retained Earnings [Member]
Diebold Nixdorf, Incorporated shareholders' equity
Adoption of accounting standard	$ 0.0	$ 0.0	$ 33.6		$ 0.0

[1] The decrease for the nine months ended September 30, 2017 is primarily attributable to the redemption value adjustment to the redeemable noncontrolling interest.