Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 1,150.2		$ 1,105.6		$ 2,178.3	$ 2,169.8
Total cost of sales	873.0		887.9		1,657.0	1,713.7
Gross profit	277.2		217.7		521.3	456.1
Selling and administrative expense	222.1		219.8		450.4	447.7
Research, development and engineering expense	36.1		40.6		73.0	82.3
Loss (gain) on sale of assets, net	11.7		0.8		15.1	(6.9)
Operating expense	269.9		344.3		538.5	606.2
Operating profit (loss)	7.3		(126.6)		(17.2)	(150.1)
Other income (expense)
Interest income	2.2		1.9		5.1	5.4
Interest expense	(49.9)		(28.4)		(100.8)	(54.4)
Foreign exchange loss, net	(5.1)		(3.1)		(2.3)	(4.5)
Miscellaneous, net	(0.4)		(2.7)		(1.8)	(2.8)
Income (loss) from continuing operations before taxes	(45.9)		(158.9)		(117.0)	(206.4)
Income tax expense (benefit)	9.2		(29.8)		69.6	(10.6)
Equity in earnings of unconsolidated subsidiaries	(0.2)		0.8		(0.6)	1.9
Net loss	(55.3)	$ (131.9)	(128.3)	$ (65.6)	(187.2)	(193.9)
Net (loss) income attributable to noncontrolling interests	(5.0)		5.1		(4.2)	12.7
Net loss attributable to Diebold Nixdorf, Incorporated	(50.3)		(133.4)		(183.0)	(206.6)
Comprehensive income (loss)	(39.2)		(197.8)		(169.5)	(272.6)
Less: comprehensive income attributable to noncontrolling interests	(7.5)		3.3		(4.0)	10.9
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(31.7)		(201.1)		(165.5)	(283.5)
Impairment of assets	0.0		83.1		0.0	83.1
Reportable Legal Entities [Member] | Parent Company [Member]
Revenues	301.6		295.0		597.1	547.5
Total cost of sales	241.5		254.8		484.5	463.7
Gross profit	60.1		40.2		112.6	83.8
Selling and administrative expense	87.5		75.4		171.5	151.1
Research, development and engineering expense	1.5		0.9		2.7	1.6
Loss (gain) on sale of assets, net	0.6		0.9		0.6	(3.5)
Operating expense	89.6		77.2		174.8	149.2
Operating profit (loss)	(29.5)		(37.0)		(62.2)	(65.4)
Other income (expense)
Interest income	0.4		0.3		1.3	0.5
Interest expense	(46.9)		(26.0)		(94.4)	(50.8)
Foreign exchange loss, net	2.0		(5.2)		0.6	(8.2)
Miscellaneous, net	8.5		0.4		21.1	(0.9)
Income (loss) from continuing operations before taxes	(65.5)		(67.5)		(133.6)	(124.8)
Income tax expense (benefit)	1.5		(13.9)		42.5	(42.5)
Equity in earnings of unconsolidated subsidiaries	16.7		(79.8)		(6.9)	(124.3)
Net loss	(50.3)		(133.4)		(183.0)	(206.6)
Net (loss) income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(50.3)		(133.4)		(183.0)	(206.6)
Comprehensive income (loss)	(33.4)		(201.1)		(165.6)	(283.5)
Less: comprehensive income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(33.4)		(201.1)		(165.6)	(283.5)
Impairment of assets			0.0			0.0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Revenues	0.0		0.2		0.1	0.4
Total cost of sales	0.2		0.2		0.4	0.6
Gross profit	(0.2)		0.0		(0.3)	(0.2)
Selling and administrative expense	1.0		1.4		2.1	2.6
Research, development and engineering expense	8.3		11.0		17.1	22.3
Loss (gain) on sale of assets, net	0.0		0.0		0.0	0.0
Operating expense	9.3		12.4		19.2	24.9
Operating profit (loss)	(9.5)		(12.4)		(19.5)	(25.1)
Other income (expense)
Interest income	0.0		0.1		0.0	0.1
Interest expense	0.0		0.0		0.0	0.0
Foreign exchange loss, net	(0.1)		(0.1)		(0.1)	(0.1)
Miscellaneous, net	0.4		(0.8)		0.7	0.7
Income (loss) from continuing operations before taxes	(9.2)		(13.2)		(18.9)	(24.4)
Income tax expense (benefit)	(1.5)		2.4		(7.9)	(18.2)
Equity in earnings of unconsolidated subsidiaries	0.0		0.0		(1.0)	0.0
Net loss	(7.7)		(15.6)		(12.0)	(6.2)
Net (loss) income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(7.7)		(15.6)		(12.0)	(6.2)
Comprehensive income (loss)	(7.7)		(15.6)		(12.0)	(6.2)
Less: comprehensive income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(7.7)		(15.6)		(12.0)	(6.2)
Impairment of assets			0.0			0.0
Reportable Legal Entities [Member] | Foreign Guarantor Subsidiary [Member]
Revenues	0.0		0.0		0.0	0.0
Total cost of sales	0.0		0.0		0.0	0.0
Gross profit	0.0		0.0			0.0
Selling and administrative expense	0.0		0.0		0.0	0.2
Research, development and engineering expense	0.0		0.0		0.0	0.0
Loss (gain) on sale of assets, net	0.0		0.0		0.0	0.0
Operating expense	0.0		0.0		0.0	0.2
Operating profit (loss)	0.0		0.0		0.0	(0.2)
Other income (expense)
Interest income	0.0		0.0		0.0	0.0
Interest expense	0.0		0.0		0.0	0.0
Foreign exchange loss, net	0.0		0.0		0.0	0.0
Miscellaneous, net	(1.8)		(0.9)		(3.5)	(1.8)
Income (loss) from continuing operations before taxes	(1.8)		(0.9)		(3.5)	(2.0)
Income tax expense (benefit)	0.4		(0.3)		1.1	1.6
Equity in earnings of unconsolidated subsidiaries	26.1		10.0		45.9	18.7
Net loss	23.9		9.4		41.3	15.1
Net (loss) income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	23.9		9.4		41.3	15.1
Comprehensive income (loss)	28.9		9.4		48.4	15.1
Less: comprehensive income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	28.9		9.4		48.4	15.1
Impairment of assets			0.0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Revenues	948.6		884.4		1,799.9	1,749.0
Total cost of sales	729.1		704.6		1,380.0	1,363.0
Gross profit	219.5		179.8		419.9	386.0
Selling and administrative expense	133.6		143.0		276.8	293.8
Research, development and engineering expense	31.0		34.9		62.5	70.2
Loss (gain) on sale of assets, net	11.1		(0.1)		14.5	(3.4)
Operating expense	175.7		260.9		353.8	443.7
Operating profit (loss)	43.8		(81.1)		66.1	(57.7)
Other income (expense)
Interest income	1.8		1.5		3.8	4.8
Interest expense	(3.0)		(2.4)		(6.4)	(3.6)
Foreign exchange loss, net	(7.0)		2.2		(2.8)	3.8
Miscellaneous, net	(7.8)		(1.5)		(17.6)	(0.9)
Income (loss) from continuing operations before taxes	27.8		(81.3)		43.1	(53.6)
Income tax expense (benefit)	8.8		(18.0)		33.9	48.5
Equity in earnings of unconsolidated subsidiaries	(0.1)		0.9		(0.5)	2.0
Net loss	18.9		(62.4)		8.7	(100.1)
Net (loss) income attributable to noncontrolling interests	(5.0)		5.1		(4.2)	12.7
Net loss attributable to Diebold Nixdorf, Incorporated	23.9		(67.5)		12.9	(112.8)
Comprehensive income (loss)	39.2		(171.1)		(3.0)	(178.7)
Less: comprehensive income attributable to noncontrolling interests	(7.5)		3.3		(4.0)	10.9
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	46.7		(174.4)		1.0	(189.6)
Impairment of assets			83.1			83.1
Consolidation, Eliminations [Member]
Revenues	(100.0)		(74.0)		(218.8)	(127.1)
Total cost of sales	(97.8)		(71.7)		(207.9)	(113.6)
Gross profit	(2.2)		(2.3)		(10.9)	(13.5)
Selling and administrative expense	0.0		0.0		0.0	0.0
Research, development and engineering expense	(4.7)		(6.2)		(9.3)	(11.8)
Loss (gain) on sale of assets, net	0.0		0.0		0.0	0.0
Operating expense	(4.7)		(6.2)		(9.3)	(11.8)
Operating profit (loss)	2.5		3.9		(1.6)	(1.7)
Other income (expense)
Interest income	0.0		0.0		0.0	0.0
Interest expense	0.0		0.0		0.0	0.0
Foreign exchange loss, net	0.0		0.0		0.0	0.0
Miscellaneous, net	0.3		0.1		(2.5)	0.1
Income (loss) from continuing operations before taxes	2.8		4.0		(4.1)	(1.6)
Income tax expense (benefit)	0.0		0.0		0.0	0.0
Equity in earnings of unconsolidated subsidiaries	(42.9)		69.7		(38.1)	105.5
Net loss	(40.1)		73.7		(42.2)	103.9
Net (loss) income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(40.1)		73.7		(42.2)	103.9
Comprehensive income (loss)	(66.2)		180.6		(37.3)	180.7
Less: comprehensive income attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	$ (66.2)		180.6		$ (37.3)	180.7
Impairment of assets			$ 0.0			$ 0.0