Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales	$ 1,151.6	$ 1,078.8	$ 1,150.2	$ 1,028.1	$ 1,289.8	$ 1,119.0	$ 1,105.6	$ 1,064.2	$ 4,408.7	$ 4,578.6	$ 4,609.3
Gross profit (1)	270.4	271.5	279.1	246.1	209.8	228.9	219.7	240.4	1,067.1	898.8	999.8
Net loss	(122.6)	(34.8)	(55.3)	(131.9)	(127.5)	(219.7)	(115.9)	(65.6)	(344.6)	(528.7)	(213.9)
Net (loss) income attributable to noncontrolling interests	0.0	0.9	(5.0)	0.8	(3.9)	(6.1)	5.1	7.6	(3.3)	2.7	27.6
Net loss attributable to Diebold Nixdorf, Incorporated	$ (122.6)	$ (35.7)	$ (50.3)	$ (132.7)	$ (123.6)	$ (213.6)	$ (121.0)	$ (73.2)	$ (341.3)	$ (531.4)	$ (241.5)
Basic and diluted weighted-average shares outstanding	$ (1.60)	$ (0.46)	$ (0.66)	$ (1.74)	$ (1.62)	$ (2.81)	$ (1.59)	$ (0.97)	$ (4.45)	$ (6.99)	$ (3.20)
Basic and diluted weighted-average shares outstanding	76.8	76.8	76.7	76.4	76.1	76.1	76.0	75.8	76.7	76.0	75.5