Supplemental Guarantor Information (Condensed Consolidation Statement of Operations) (Details) - USD ($) $ 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
Cost of sales									3,341.6	3,679.8	3,609.5
Gross profit	270.4	271.5	279.1	246.1	209.8	228.9	219.7	240.4	1,067.1	898.8	999.8
Selling and administrative expense									908.8	893.5	933.7
Research, development and engineering expense									147.1	157.4	155.5
Impairment of assets									30.2	180.2	3.1
(Gain) loss on sale of assets, net									7.6	(6.7)	1.0
Total operating expense									1,093.7	1,224.4	1,093.3
Operating loss									(26.6)	(325.6)	(93.5)
Other income (expense)
Interest income									9.3	8.7	20.3
Interest expense									(202.9)	(154.9)	(117.3)
Foreign exchange loss, net									(5.1)	(2.5)	(3.9)
Miscellaneous, net									(3.6)	(4.0)	2.5
Loss before taxes									(228.9)	(478.3)	(191.9)
Income tax expense									116.7	37.2	28.3
Equity in earnings (loss) of unconsolidated subsidiaries, net									1.0	(13.2)	6.3
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)
Comprehensive loss									(417.0)	(640.6)	(63.0)
Less: comprehensive income attributable to noncontrolling interests									(4.7)	(1.2)	33.5
Comprehensive loss attributable to Diebold Nixdorf, Incorporated									(412.3)	(639.4)	(96.5)
Reportable Legal Entities [Member] | Parent Company [Member]
Net sales									1,206.4	1,210.2	1,126.4
Cost of sales									962.2	1,045.4	902.0
Gross profit									244.2	164.8	224.4
Selling and administrative expense									350.9	306.6	283.8
Research, development and engineering expense									6.7	2.8	3.1
Impairment of assets									5.1	0.0	3.1
(Gain) loss on sale of assets, net									(6.3)	(3.4)	0.5
Total operating expense									356.4	306.0	290.5
Operating loss									(112.2)	(141.2)	(66.1)
Other income (expense)
Interest income									2.1	0.3	2.3
Interest expense									(190.1)	(140.7)	(108.7)
Foreign exchange loss, net									1.0	(17.3)	(0.5)
Miscellaneous, net									92.7	36.4	6.2
Loss before taxes									(206.5)	(262.5)	(166.8)
Income tax expense									105.3	18.8	36.1
Equity in earnings (loss) of unconsolidated subsidiaries, net									(29.5)	(250.1)	(38.6)
Net loss									(341.3)	(531.4)	(241.5)
Net (loss) income attributable to noncontrolling interests									0.0	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated									(341.3)	(531.4)	(241.5)
Comprehensive loss									(412.3)	(639.4)	(96.5)
Less: comprehensive income attributable to noncontrolling interests									0.0	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated									(412.3)	(639.4)	(96.5)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net sales									0.2	0.5	7.4
Cost of sales									0.8	1.9	12.3
Gross profit									(0.6)	(1.4)	(4.9)
Selling and administrative expense									4.4	4.9	10.5
Research, development and engineering expense									33.4	44.6	40.6
Impairment of assets									0.0	0.0	0.0
(Gain) loss on sale of assets, net									0.2	0.1	0.4
Total operating expense									38.0	49.6	51.5
Operating loss									(38.6)	(51.0)	(56.4)
Other income (expense)
Interest income									0.0	0.1	0.2
Interest expense									0.0	0.0	0.0
Foreign exchange loss, net									(0.1)	(0.2)	(0.1)
Miscellaneous, net									1.3	1.3	7.7
Loss before taxes									(37.4)	(49.8)	(48.6)
Income tax expense									(7.8)	(10.2)	(15.5)
Equity in earnings (loss) of unconsolidated subsidiaries, net									0.0	0.0	0.0
Net loss									(29.6)	(39.6)	(33.1)
Net (loss) income attributable to noncontrolling interests									0.0	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated									(29.6)	(39.6)	(33.1)
Comprehensive loss									(29.6)	(39.6)	(33.1)
Less: comprehensive income attributable to noncontrolling interests									0.0	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated									(29.6)	(39.6)	(33.1)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net sales									3,598.7	3,761.2	3,480.6
Cost of sales									2,752.7	3,000.6	2,700.3
Gross profit									846.0	760.6	780.3
Selling and administrative expense									553.5	582.0	639.4
Research, development and engineering expense									127.1	133.0	111.8
Impairment of assets									25.1	180.2	0.0
(Gain) loss on sale of assets, net									13.7	(3.4)	0.1
Total operating expense									719.4	891.8	751.3
Operating loss									126.6	(131.2)	29.0
Other income (expense)
Interest income									7.2	8.3	17.8
Interest expense									(12.8)	(14.2)	(8.6)
Foreign exchange loss, net									(6.0)	15.0	(3.3)
Miscellaneous, net									(95.6)	(41.7)	(11.1)
Loss before taxes									19.4	(163.8)	23.8
Income tax expense									21.8	28.6	7.7
Equity in earnings (loss) of unconsolidated subsidiaries, net									1.0	(13.2)	6.3
Net loss									(1.4)	(205.6)	22.4
Net (loss) income attributable to noncontrolling interests									(3.3)	2.7	27.6
Net loss attributable to Diebold Nixdorf, Incorporated									1.9	(208.3)	(5.2)
Comprehensive loss									(89.4)	(302.6)	193.7
Less: comprehensive income attributable to noncontrolling interests									(4.7)	(1.2)	33.5
Comprehensive loss attributable to Diebold Nixdorf, Incorporated									(84.7)	(301.4)	160.2
Consolidation, Eliminations [Member]
Net sales									(396.6)	(393.3)	(5.1)
Cost of sales									(374.1)	(368.1)	(5.1)
Gross profit									(22.5)	(25.2)	0.0
Selling and administrative expense									0.0	0.0	0.0
Research, development and engineering expense									(20.1)	(23.0)	0.0
Impairment of assets									0.0	0.0	0.0
(Gain) loss on sale of assets, net									0.0	0.0	0.0
Total operating expense									(20.1)	(23.0)	0.0
Operating loss									(2.4)	(2.2)	0.0
Other income (expense)
Interest income									0.0	0.0	0.0
Interest expense									0.0	0.0	0.0
Foreign exchange loss, net									0.0	0.0	0.0
Miscellaneous, net									(2.0)	0.0	(0.3)
Loss before taxes									(4.4)	(2.2)	(0.3)
Income tax expense									(2.6)	0.0	0.0
Equity in earnings (loss) of unconsolidated subsidiaries, net									29.5	250.1	38.6
Net loss									27.7	247.9	38.3
Net (loss) income attributable to noncontrolling interests									0.0	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated									27.7	247.9	38.3
Comprehensive loss									114.3	341.0	(127.1)
Less: comprehensive income attributable to noncontrolling interests									0.0	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated									$ 114.3	$ 341.0	$ (127.1)