Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income (loss) used in basic and diluted earnings (loss) per share
Loss from continuing operations, net of tax										$ (566.0)	$ (213.9)	$ (179.3)
Net income attributable to noncontrolling interests, net of tax		$ (3.9)	$ (6.1)	$ 5.1	$ 7.6	$ 7.4	$ 6.6	$ 7.0	$ 6.6	2.7	27.6	6.0
Income (loss) before discontinued operations, net of tax										(568.7)	(241.5)	(185.3)
Income from discontinued operations, net of tax										0.0	0.0	143.7
Net loss attributable to Diebold Nixdorf, Incorporated		$ (123.6)	$ (238.5)	$ (133.4)	$ (73.2)	$ (110.1)	$ (39.2)	$ (31.1)	$ (61.1)	$ (568.7)	$ (241.5)	$ (41.6)
Denominator
Weighted-average number of common shares used in basic earnings (loss) per share		76.1	76.1	76.0	75.8	75.5	75.5	75.5	75.3	76.0	75.5	69.1
Effect of dilutive shares (1) (shares)	[1]									0.0	0.0	0.0
Weighted-average number of shares used in diluted earnings (loss) per share (shares)		76.1	76.1	76.0	75.8	75.5	75.5	75.5	75.3	76.0	75.5	69.1
Basic and diluted earnings (loss) per share
Loss before discontinued operations, net of tax										$ (7.48)	$ (3.20)	$ (2.68)
Income from discontinued operations, net of tax										0.00	0.00	2.08
Net loss attributable to Diebold Nixdorf, Incorporated		$ (1.62)	$ (3.13)	$ (1.76)	$ (0.97)	$ (1.46)	$ (0.52)	$ (0.41)	$ (0.81)	(7.48)	(3.20)	(0.60)
Diluted earnings (loss) per share
Income (loss) before discontinued operations, net of tax										(7.48)	(3.20)	(2.68)
Income from discontinued operations, net of tax										0.00	0.00	2.08
Net (loss) income attributable to Diebold, Incorporated		$ (1.62)	$ (3.13)	$ (1.76)	$ (0.97)	$ (1.46)	$ (0.52)	$ (0.41)	$ (0.81)	$ (7.48)	$ (3.20)	$ (0.60)
Incremental shares, excluded from dilutive calculation, due to resulting in operating loss										0.7	0.7	0.6
Anti-dilutive shares
Anti-dilutive shares not used in calculating diluted weighted-average shares (shares)										4.5	3.4	2.1

[1] Incremental shares of 0.7, 0.7 and 0.6 were excluded from the computation of diluted loss per share for the years ended December 31, 2018, 2017 and 2016, respectively, because their effect is anti-dilutive due to the loss from continuing operations.