Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Amounts attributable to Diebold Nixdorf, Incorporated
Net loss		$ (34.8)	$ (55.3)	$ (131.9)	$ (244.6)	$ (128.3)	$ (65.6)	$ (222.0)	$ (438.5)
Net (loss) income attributable to noncontrolling interests		0.9			(6.1)			(3.3)	6.6
Net loss attributable to Diebold Nixdorf, Incorporated		$ (35.7)			$ (238.5)			$ (218.7)	$ (445.1)
Denominator (in millions)
Basic and diluted weighted-average shares outstanding	[1]	76.8			76.1			76.6	76.0
Basic earnings (loss) per share
Basic earnings (loss) per share		$ (0.46)			$ (3.13)			$ (2.86)	$ (5.86)
Diluted earnings (loss) per share
Diluted earnings (loss) per share		$ (0.46)			$ (3.13)			$ (2.86)	$ (5.86)
Anti-dilutive shares (in milllions)
Anti-dilutive shares not used in calculating diluted weighted-average		2.7			4.7			3.4	4.6
Incremental Shares Excluded From Dilutive Calculation Due To Resulting in Operating Loss		2.2			0.7			1.7	0.8

[1] Incremental shares of 2.2 and 0.7 shares for the three months ended September 30, 2019 and 2018, respectively, and 1.7 and 0.8 shares for the nine months ended September 30, 2019 and 2018, respectively, would have been included in the weighted-average number of shares used in diluted earnings (loss) per share 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.