Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Amounts attributable to Diebold Nixdorf, Incorporated
Net loss		$ (93.4)	$ (131.9)
Net (loss) income attributable to noncontrolling interests		(0.6)	0.8
Net loss attributable to Diebold Nixdorf, Incorporated		$ (92.8)	$ (132.7)
Denominator (in millions)
Basic and diluted weighted-average shares outstanding	[1]	77.2	76.4
Basic earnings (loss) per share
Basic and diluted loss per share		$ (1.20)	$ (1.74)
Anti-dilutive shares (in milllions)
Anti-dilutive shares not used in calculating diluted weighted-average		2.8	3.7
Incremental Shares Excluded From Dilutive Calculation Due To Resulting in Operating Loss		3.1	1.2

[1] Incremental shares of 3.1 and 1.2 for the three months ended March 31, 2020 and 2019, respectively, would have been included in the weighted-average number of shares used in the computation of diluted earnings (loss) per share because their effects are dilutive, but are excluded due to the Company's net loss.