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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Total net sales	$ 1,105.6	$ 1,133.9	$ 2,169.8	$ 2,236.7
Cost of sales	885.9	896.1	1,709.2	1,756.4
Gross profit	219.7	237.8	460.6	480.3
Selling and administrative expense	219.8	236.8	447.7	483.8
Research, development and engineering expense	40.6	38.8	82.3	80.2
Impairment of assets	90.0	0.0	90.0	3.1
(Gain) loss on sale of assets, net	0.8	(7.7)	(6.9)	(8.1)
Operating expense	351.2	267.9	613.1	559.0
Operating profit (loss)	(131.5)	(30.1)	(152.5)	(78.7)
Other income (expense)
Interest income	1.9	5.1	5.4	11.5
Interest expense	(28.4)	(32.2)	(54.4)	(63.0)
Foreign exchange gain (loss), net	(3.1)	(4.6)	(4.5)	(7.7)
Equity in earnings of investees	0.0	0.0	0.0	0.0
Miscellaneous, net	(1.9)	1.9	(0.9)	3.2
Income (loss) from continuing operations before taxes	(163.0)	(59.9)	(206.9)	(134.7)
Income tax expense (benefit)	(29.6)	(36.3)	(10.2)	(58.9)
Net income (loss)	(133.4)	(23.6)	(196.7)	(75.8)
Net income attributable to noncontrolling interests	5.1	7.0	12.7	13.6
Net income (loss) attributable to Diebold Nixdorf, Incorporated	(138.5)	(30.6)	(209.4)	(89.4)
Comprehensive income (loss)	(202.9)	62.2	(275.4)	54.9
Less: comprehensive income attributable to noncontrolling interests	3.3	8.7	10.9	15.3
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(206.2)	53.5	(286.3)	39.6
Reportable Legal Entities [Member] | Parent Company [Member]
Total net sales	392.4	274.6	644.9	542.0
Cost of sales	351.6	217.9	559.9	434.4
Gross profit	40.8	56.7	85.0	107.6
Selling and administrative expense	75.3	78.1	151.0	146.3
Research, development and engineering expense	0.9	0.9	1.6	0.8
Impairment of assets	0.0		0.0	3.1
(Gain) loss on sale of assets, net	0.9	0.0	(3.5)	0.0
Operating expense	77.1	79.0	149.1	150.2
Operating profit (loss)	(36.3)	(22.3)	(64.1)	(42.6)
Other income (expense)
Interest income	0.3	0.6	0.5	1.2
Interest expense	(26.0)	(29.7)	(50.8)	(58.8)
Foreign exchange gain (loss), net	(5.2)	2.7	(8.2)	2.7
Equity in earnings of investees	(85.5)	(27.9)	(128.2)	(53.4)
Miscellaneous, net	0.4	7.3	(0.9)	7.2
Income (loss) from continuing operations before taxes	(152.3)	(69.3)	(251.7)	(143.7)
Income tax expense (benefit)	(13.8)	(38.7)	(42.3)	(54.3)
Net income (loss)	(138.5)	(30.6)	(209.4)	(89.4)
Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	(138.5)	(30.6)	(209.4)	(89.4)
Comprehensive income (loss)	(206.2)	53.5	(286.3)	39.6
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(206.2)	53.5	(286.3)	39.6
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Total net sales	0.1	1.3	0.3	6.2
Cost of sales	0.2	2.7	0.6	8.6
Gross profit	(0.1)	(1.4)	(0.3)	(2.4)
Selling and administrative expense	1.4	2.1	2.6	5.0
Research, development and engineering expense	11.0	9.8	22.3	19.6
Impairment of assets	0.0		0.0	0.0
(Gain) loss on sale of assets, net	0.0	0.0	0.0	0.1
Operating expense	12.4	11.9	24.9	24.7
Operating profit (loss)	(12.5)	(13.3)	(25.2)	(27.1)
Other income (expense)
Interest income	0.1	0.0	0.1	0.1
Interest expense	0.0	0.0	0.0	0.0
Foreign exchange gain (loss), net	(0.1)	0.1	(0.1)	0.1
Equity in earnings of investees	0.0	0.0	0.0	0.0
Miscellaneous, net	(0.8)	2.1	0.7	4.0
Income (loss) from continuing operations before taxes	(13.3)	(11.1)	(24.5)	(22.9)
Income tax expense (benefit)	2.3	(16.2)	(18.3)	(20.3)
Net income (loss)	(15.6)	5.1	(6.2)	(2.6)
Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	(15.6)	5.1	(6.2)	(2.6)
Comprehensive income (loss)	(15.6)	5.1	(6.2)	(2.6)
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(15.6)	5.1	(6.2)	(2.6)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Total net sales	713.1	858.7	1,524.6	1,693.5
Cost of sales	534.1	676.2	1,148.7	1,318.4
Gross profit	179.0	182.5	375.9	375.1
Selling and administrative expense	143.1	156.6	294.1	332.5
Research, development and engineering expense	28.7	28.1	58.4	59.8
Impairment of assets	90.0		90.0	0.0
(Gain) loss on sale of assets, net	(0.1)	(7.7)	(3.4)	(8.2)
Operating expense	261.7	177.0	439.1	384.1
Operating profit (loss)	(82.7)	5.5	(63.2)	(9.0)
Other income (expense)
Interest income	1.5	4.5	4.8	10.2
Interest expense	(2.4)	(2.5)	(3.6)	(4.2)
Foreign exchange gain (loss), net	2.2	(7.4)	3.8	(10.5)
Equity in earnings of investees	0.0	0.0	0.0	0.0
Miscellaneous, net	(1.5)	(7.6)	(0.7)	(7.1)
Income (loss) from continuing operations before taxes	(82.9)	(7.5)	(58.9)	(20.6)
Income tax expense (benefit)	(18.1)	18.6	50.4	15.7
Net income (loss)	(64.8)	(26.1)	(109.3)	(36.3)
Net income attributable to noncontrolling interests	5.1	7.0	12.7	13.6
Net income (loss) attributable to Diebold Nixdorf, Incorporated	(69.9)	(33.1)	(122.0)	(49.9)
Comprehensive income (loss)	(173.5)	69.7	(188.0)	116.8
Less: comprehensive income attributable to noncontrolling interests	3.3	8.7	10.9	15.3
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(176.8)	61.0	(198.9)	101.5
Consolidation, Eliminations [Member]
Total net sales	0.0	(0.7)	0.0	(5.0)
Cost of sales	0.0	(0.7)	0.0	(5.0)
Gross profit	0.0	0.0	0.0	0.0
Selling and administrative expense	0.0	0.0	0.0	0.0
Research, development and engineering expense	0.0	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	0.0
Operating expense	0.0	0.0	0.0	0.0
Operating profit (loss)	0.0	0.0	0.0	0.0
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 gain (loss), net	0.0	0.0	0.0	0.0
Equity in earnings of investees	85.5	27.9	128.2	53.4
Miscellaneous, net	0.0	0.1	0.0	(0.9)
Income (loss) from continuing operations before taxes	85.5	28.0	128.2	52.5
Income tax expense (benefit)	0.0	0.0	0.0	0.0
Net income (loss)	85.5	28.0	128.2	52.5
Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	85.5	28.0	128.2	52.5
Comprehensive income (loss)	192.4	(66.1)	205.1	(98.9)
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	$ 192.4	$ (66.1)	$ 205.1	$ (98.9)