Supplemental Guarantor Information (Condensed Consolidation Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales	$ 1,289.8	$ 1,119.0	$ 1,105.6	$ 1,064.2	$ 1,249.9	$ 1,122.7	$ 1,133.9	$ 1,102.8	$ 4,578.6	$ 4,609.3	$ 3,316.3
Cost of sales									3,687.7	3,609.5	2,604.6
Gross profit (loss)	207.8	227.0	217.7	238.4	286.1	236.8	237.1	239.8	890.9	999.8	711.7
Selling and administrative expense									885.6	933.7	761.2
Research, development and engineering expense									157.4	155.5	110.2
Impairment of assets		134.4	83.1						217.5	3.1	9.8
(Gain) loss on sale of assets, net									(6.7)	1.0	0.3
Total operating expense									1,253.8	1,093.3	881.5
Operating profit (loss)									(362.9)	(93.5)	(169.8)
Other income (expense)
Interest income									8.7	20.3	21.5
Interest expense									(154.9)	(117.3)	(101.4)
Foreign exchange loss, net									(2.5)	(3.9)	(2.1)
Equity in (loss) earnings of unconsolidated subsidiaries, net									(13.2)	6.3	0.4
Miscellaneous, net									(4.0)	2.5	3.1
Income (loss) from continuing operations before taxes									(515.6)	(191.9)	(248.7)
Income tax expense (benefit)									37.2	28.3	(69.0)
Loss from continuing operations, net of tax									(566.0)	(213.9)	(179.3)
Income (loss) from discontinued operations, net of tax											143.7
Net loss	(127.5)	(244.6)	(128.3)	(65.6)	(102.7)	(32.6)	(24.1)	(54.5)	(566.0)	(213.9)	(35.6)
Net income attributable to noncontrolling interests, net of tax	(3.9)	(6.1)	5.1	7.6	7.4	6.6	7.0	6.6	2.7	27.6	6.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	$ (123.6)	$ (238.5)	$ (133.4)	$ (73.2)	$ (110.1)	$ (39.2)	$ (31.1)	$ (61.1)	(568.7)	(241.5)	(41.6)
Comprehensive loss									(677.3)	(63.0)	(55.6)
Less: comprehensive income attributable to noncontrolling interests									(1.2)	33.5	9.2
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated									(676.1)	(96.5)	(64.8)
Reportable Legal Entities [Member] | Parent Company [Member]
Net sales									2,158.9	1,126.4	1,137.1
Cost of sales									1,994.1	902.0	888.5
Gross profit (loss)									164.8	224.4	248.6
Selling and administrative expense									306.6	283.8	314.4
Research, development and engineering expense									2.8	3.1	7.9
Impairment of assets									0.0	3.1	0.0
(Gain) loss on sale of assets, net									(3.4)	0.5	0.3
Total operating expense									306.0	290.5	322.6
Operating profit (loss)									(141.2)	(66.1)	(74.0)
Other income (expense)
Interest income									0.3	2.3	2.5
Interest expense									(140.7)	(108.7)	(95.1)
Foreign exchange loss, net									(17.3)	(0.5)	(3.5)
Equity in (loss) earnings of unconsolidated subsidiaries, net									(287.4)	(38.6)	(58.3)
Miscellaneous, net									36.4	6.2	(3.2)
Income (loss) from continuing operations before taxes									(262.5)	(166.8)	(173.3)
Income tax expense (benefit)									18.8	36.1	(54.8)
Loss from continuing operations, net of tax											(176.8)
Income (loss) from discontinued operations, net of tax											135.2
Net loss									(568.7)	(241.5)	(41.6)
Net income attributable to noncontrolling interests, net of tax									0.0	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated									(568.7)	(241.5)	(41.6)
Comprehensive loss									(676.1)	(96.5)	(64.8)
Less: comprehensive income attributable to noncontrolling interests									0.0	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated									(676.1)	(96.5)	(64.8)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net sales									0.5	7.4	85.0
Cost of sales									1.9	12.3	84.2
Gross profit (loss)									(1.4)	(4.9)	0.8
Selling and administrative expense									4.9	10.5	11.6
Research, development and engineering expense									44.6	40.6	45.7
Impairment of assets									0.0	0.0	5.1
(Gain) loss on sale of assets, net									0.1	0.4	(0.1)
Total operating expense									49.6	51.5	62.3
Operating profit (loss)									(51.0)	(56.4)	(61.5)
Other income (expense)
Interest income									0.1	0.2	0.6
Interest expense									0.0	0.0	(0.1)
Foreign exchange loss, net									(0.2)	(0.1)	(0.1)
Equity in (loss) earnings of unconsolidated subsidiaries, net									0.0	0.0	0.0
Miscellaneous, net									1.3	7.7	7.8
Income (loss) from continuing operations before taxes									(49.8)	(48.6)	(53.3)
Income tax expense (benefit)									(10.2)	(15.5)	(28.6)
Loss from continuing operations, net of tax											(24.7)
Income (loss) from discontinued operations, net of tax											0.0
Net loss									(39.6)	(33.1)	(24.7)
Net income attributable to noncontrolling interests, net of tax									0.0	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated									(39.6)	(33.1)	(24.7)
Comprehensive loss									(39.6)	(33.1)	(24.7)
Less: comprehensive income attributable to noncontrolling interests									0.0	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated									(39.6)	(33.1)	(24.7)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net sales									2,419.3	3,480.6	2,177.4
Cost of sales									1,691.8	2,700.3	1,714.2
Gross profit (loss)									727.5	780.3	463.2
Selling and administrative expense									574.1	639.4	435.2
Research, development and engineering expense									110.0	111.8	56.6
Impairment of assets									217.5	0.0	4.7
(Gain) loss on sale of assets, net									(3.4)	0.1	0.1
Total operating expense									898.2	751.3	496.6
Operating profit (loss)									(170.7)	29.0	(33.4)
Other income (expense)
Interest income									8.3	17.8	18.4
Interest expense									(14.2)	(8.6)	(6.2)
Foreign exchange loss, net									15.0	(3.3)	1.5
Equity in (loss) earnings of unconsolidated subsidiaries, net									(13.2)	6.3	0.4
Miscellaneous, net									(41.7)	(11.1)	(0.5)
Income (loss) from continuing operations before taxes									(203.3)	23.8	(20.2)
Income tax expense (benefit)									28.6	7.7	14.4
Loss from continuing operations, net of tax											(34.2)
Income (loss) from discontinued operations, net of tax											8.5
Net loss									(245.1)	22.4	(25.7)
Net income attributable to noncontrolling interests, net of tax									2.7	27.6	6.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated									(247.8)	(5.2)	(31.7)
Comprehensive loss									(339.3)	193.7	(60.3)
Less: comprehensive income attributable to noncontrolling interests									(1.2)	33.5	9.2
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated									(338.1)	160.2	(69.5)
Consolidation, Eliminations [Member]
Net sales									(0.1)	(5.1)	(83.2)
Cost of sales									(0.1)	(5.1)	(82.3)
Gross profit (loss)									0.0	0.0	(0.9)
Selling and administrative expense									0.0	0.0	0.0
Research, development and engineering expense									0.0	0.0	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									0.0	0.0	0.0
Operating profit (loss)									0.0	0.0	(0.9)
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
Equity in (loss) earnings of unconsolidated subsidiaries, net									287.4	38.6	58.3
Miscellaneous, net									0.0	(0.3)	(1.0)
Income (loss) from continuing operations before taxes									0.0	(0.3)	(1.9)
Income tax expense (benefit)									0.0	0.0	0.0
Loss from continuing operations, net of tax											56.4
Income (loss) from discontinued operations, net of tax											0.0
Net loss									287.4	38.3	56.4
Net income attributable to noncontrolling interests, net of tax									0.0	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated									287.4	38.3	56.4
Comprehensive loss									377.7	(127.1)	94.2
Less: comprehensive income attributable to noncontrolling interests									0.0	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated									$ 377.7	$ (127.1)	$ 94.2