Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 1,078.8			$ 1,119.0			$ 3,257.1	$ 3,288.8
Total cost of sales	807.3			890.1			2,460.4	2,599.8
Gross profit	271.5			228.9			796.7	689.0
Selling and administrative expense	220.0			218.1			674.3	669.8
Research, development and engineering expense	36.8			36.6			109.8	118.9
Impairment of assets	0.0			134.4			0.0	217.5
(Gain) loss on sale of assets, net	(8.5)			0.1			6.6	(6.8)
Operating expense	248.3			389.2			790.7	999.4
Operating profit (loss)	23.2			(160.3)			6.0	(310.4)
Other income (expense)
Interest income	1.9			2.2			7.0	7.6
Interest expense	(52.5)			(45.2)			(153.3)	(99.6)
Foreign exchange (loss) gain, net	(1.8)			2.2			(4.1)	(2.3)
Miscellaneous, net	(1.0)			(1.5)			(2.8)	(4.3)
Income (loss) from continuing operations before taxes	(30.2)			(202.6)			(147.2)	(409.0)
Income tax expense	5.2			45.2			74.8	34.6
Equity in earnings of unconsolidated subsidiaries	0.6			3.2			0.0	5.1
Net loss	(34.8)	$ (55.3)	$ (131.9)	(244.6)	$ (128.3)	$ (65.6)	(222.0)	(438.5)
Net (loss) income attributable to noncontrolling interests	0.9			(6.1)			(3.3)	6.6
Net loss attributable to Diebold Nixdorf, Incorporated	(35.7)			(238.5)			(218.7)	(445.1)
Comprehensive income (loss)	(126.7)			(263.7)			(296.2)	(536.3)
Less: comprehensive (loss) income attributable to noncontrolling interests	(0.1)			(7.4)			(4.1)	3.5
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(126.6)			(256.3)			(292.1)	(539.8)
Reportable Legal Entities [Member] | Parent Company [Member]
Net sales	292.4			309.1			889.5	856.6
Total cost of sales	227.8			267.9			712.1	731.6
Gross profit	64.6			41.2			177.4	125.0
Selling and administrative expense	87.4			69.5			259.1	220.5
Research, development and engineering expense	1.9			0.5			4.6	2.1
Impairment of assets				0.0				0.0
(Gain) loss on sale of assets, net	(7.2)			0.1			(6.6)	(3.4)
Operating expense	82.1			70.1			257.1	219.2
Operating profit (loss)	(17.5)			(28.9)			(79.7)	(94.2)
Other income (expense)
Interest income	0.1			0.5			1.4	1.1
Interest expense	(49.3)			(41.0)			(143.7)	(91.9)
Foreign exchange (loss) gain, net	0.7			2.8			1.3	(5.5)
Miscellaneous, net	18.9			0.3			39.9	(0.5)
Income (loss) from continuing operations before taxes	(47.1)			(66.3)			(180.8)	(191.0)
Income tax expense	2.8			83.5			45.3	41.1
Equity in earnings of unconsolidated subsidiaries	14.2			(88.7)			7.4	(213.0)
Net loss	(35.7)			(238.5)			(218.7)	(445.1)
Net (loss) income attributable to noncontrolling interests	0.0			0.0			0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(35.7)			(238.5)			(218.7)	(445.1)
Comprehensive income (loss)	(126.6)			(256.3)			(292.1)	(539.8)
Less: comprehensive (loss) income attributable to noncontrolling interests	0.0			0.0			0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(126.6)			(256.3)			(292.1)	(539.8)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net sales	0.1			0.1			0.1	0.4
Total cost of sales	0.2			1.1			0.6	1.7
Gross profit	(0.1)			(1.0)			(0.5)	(1.3)
Selling and administrative expense	1.1			1.2			3.2	3.8
Research, development and engineering expense	9.0			10.8			26.1	33.1
Impairment of assets				0.0				0.0
(Gain) loss on sale of assets, net	0.0			0.0			0.0	0.0
Operating expense	10.1			12.0			29.3	36.9
Operating profit (loss)	(10.2)			(13.0)			(29.8)	(38.2)
Other income (expense)
Interest income	0.0			0.0			0.0	0.1
Interest expense	0.0			0.0			0.0	0.0
Foreign exchange (loss) gain, net	0.0			(0.1)			(0.1)	(0.1)
Miscellaneous, net	0.2			0.3			1.0	0.9
Income (loss) from continuing operations before taxes	(10.0)			(12.8)			(28.9)	(37.3)
Income tax expense	0.8			12.6			(7.1)	(5.6)
Equity in earnings of unconsolidated subsidiaries	1.0			0.0			0.0	0.0
Net loss	(9.8)			(25.4)			(21.8)	(31.7)
Net (loss) income attributable to noncontrolling interests	0.0			0.0			0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(9.8)			(25.4)			(21.8)	(31.7)
Comprehensive income (loss)	(9.8)			(25.4)			(21.8)	(31.7)
Less: comprehensive (loss) income attributable to noncontrolling interests	0.0			0.0			0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(9.8)			(25.4)			(21.8)	(31.7)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net sales	883.0			943.3			2,683.3	2,692.4
Total cost of sales	670.6			748.3			2,047.1	2,107.3
Gross profit	212.4			195.0			636.2	585.1
Selling and administrative expense	131.5			147.4			412.0	445.5
Research, development and engineering expense	31.3			31.2			93.9	101.4
Impairment of assets				134.4				217.5
(Gain) loss on sale of assets, net	(1.3)			0.0			13.2	(3.4)
Operating expense	161.5			313.0			519.1	761.0
Operating profit (loss)	50.9			(118.0)			117.1	(175.9)
Other income (expense)
Interest income	1.8			1.7			5.6	6.4
Interest expense	(3.2)			(4.2)			(9.6)	(7.7)
Foreign exchange (loss) gain, net	(2.5)			(0.5)			(5.3)	3.3
Miscellaneous, net	(19.6)			(2.1)			(40.7)	(4.7)
Income (loss) from continuing operations before taxes	27.4			(123.1)			67.1	(178.6)
Income tax expense	1.6			(50.9)			36.6	(0.9)
Equity in earnings of unconsolidated subsidiaries	0.6			3.2			0.0	5.1
Net loss	26.4			(69.0)			30.5	(172.6)
Net (loss) income attributable to noncontrolling interests	0.9			(6.1)			(3.3)	6.6
Net loss attributable to Diebold Nixdorf, Incorporated	25.5			(62.9)			33.8	(179.2)
Comprehensive income (loss)	(40.1)			(84.6)			(47.8)	(266.9)
Less: comprehensive (loss) income attributable to noncontrolling interests	(0.1)			(7.4)			(4.1)	3.5
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(40.0)			(77.2)			(43.7)	(270.4)
Consolidation, Eliminations [Member]
Net sales	(96.7)			(133.5)			(315.8)	(260.6)
Total cost of sales	(91.3)			(127.2)			(299.4)	(240.8)
Gross profit	(5.4)			(6.3)			(16.4)	(19.8)
Selling and administrative expense	0.0			0.0			0.0	0.0
Research, development and engineering expense	(5.4)			(5.9)			(14.8)	(17.7)
Impairment of assets				0.0				0.0
(Gain) loss on sale of assets, net	0.0			0.0			0.0	0.0
Operating expense	(5.4)			(5.9)			(14.8)	(17.7)
Operating profit (loss)	0.0			(0.4)			(1.6)	(2.1)
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) gain, net	0.0			0.0			0.0	0.0
Miscellaneous, net	(0.5)			0.0			(3.0)	0.0
Income (loss) from continuing operations before taxes	(0.5)			(0.4)			(4.6)	(2.1)
Income tax expense	0.0			0.0			0.0	0.0
Equity in earnings of unconsolidated subsidiaries	(15.2)			88.7			(7.4)	213.0
Net loss	(15.7)			88.3			(12.0)	210.9
Net (loss) income attributable to noncontrolling interests	0.0			0.0			0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(15.7)			88.3			(12.0)	210.9
Comprehensive income (loss)	49.8			102.6			65.5	302.1
Less: comprehensive (loss) income attributable to noncontrolling interests	0.0			0.0			0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	$ 49.8			$ 102.6			$ 65.5	$ 302.1