Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Diebold Nixdorf, Incorporated shareholders' equity
Balance at beginning of period	$ 426.9	$ 533.1	$ 470.0		$ 591.4
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(206.2)	53.5	(286.3)		39.6
Common shares	0.3	0.1	0.9		0.7
Additional capital	6.4	8.1	19.4		(24.7)
Treasury shares	(0.4)	0.1	(2.9)		(4.5)
Dividends paid	0.0	(7.7)	(7.7)		(15.3)
Balance at end of period	227.0	587.2	227.0		587.2
Noncontrolling interests
Balance at beginning of period	36.2	34.8	36.8		433.4
Comprehensive income attributable to noncontrolling interests, net	3.3	8.7	10.9	[1]	15.3
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	(3.9)	(6.0)	(8.3)		(11.7)
Distributions to noncontrolling interest holders	0.0	0.0	(0.5)		(12.8)
Liquidation of noncontrolling interests	(1.5)	0.0	(4.8)		0.0
Balance at end of period	34.1	37.5	34.1		37.5
Adjustments for New Accounting Pronouncement [Member] | Retained Earnings [Member]
Diebold Nixdorf, Incorporated shareholders' equity
Adoption of accounting standards	$ 0.0	$ 0.0	$ 33.6		$ 0.0

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