Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings used in basic and diluted earnings per share
Net income (loss)	$ 5.5	$ (7.5)
Net income attributable to noncontrolling interests	0.5	0.8
Net income (loss) attributable to Diebold Nixdorf	$ 5.0	$ (8.3)
Weighted-average common shares in basic earnings (loss) per share (in shares)	35.1	37.6
Effect of dilutive shares (in shares)	0.6	0.0
Weighted-average number of shares used in diluted earnings (loss) per share (in shares)	35.7	37.6
Net income (loss) attributable to Diebold Nixdorf
Basic earnings (loss) per share (in dollars per share)	$ 0.14	$ (0.22)
Diluted (loss) earnings per share (in dollars per share)	$ 0.14	$ (0.22)
Anti-dilutive shares
Anti-dilutive shares not used in calculating diluted weighted-average shares (in shares)	0.0	0.5
Shares excluded from computation of diluted loss per share due to net loss position (in shares)		0.3