Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total net sales	$ 1,064.2	$ 1,102.8
Cost of sales	823.3	860.3
Gross profit	240.9	242.5
Selling and administrative expense	227.9	247.0
Research, development and engineering expense	41.7	41.4
Impairment of assets	0.0	3.1
(Gain) loss on sale of assets, net	(7.7)	(0.4)
Operating expense	261.9	291.1
Operating profit (loss)	(21.0)	(48.6)
Other income (expense)
Interest income	3.5	6.4
Interest expense	(26.0)	(30.8)
Foreign exchange gain (loss), net	(1.4)	(3.1)
Equity in earnings of investees	0.0	0.0
Miscellaneous, net	1.0	1.3
Income (loss) from continuing operations before taxes	(43.9)	(74.8)
Income tax expense (benefit)	19.4	(22.6)
Net income (loss)	(63.3)	(52.2)
Net income attributable to noncontrolling interests	7.6	6.6
Net income (loss) attributable to Diebold Nixdorf, Incorporated	(70.9)	(58.8)
Comprehensive income (loss)	(72.5)	(7.3)
Less: comprehensive income attributable to noncontrolling interests	7.6	6.6
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(80.1)	(13.9)
Reportable Legal Entities [Member] | Parent Company [Member]
Total net sales	252.5	267.4
Cost of sales	208.3	216.5
Gross profit	44.2	50.9
Selling and administrative expense	75.7	68.2
Research, development and engineering expense	0.7	(0.1)
(Gain) loss on sale of assets, net	(4.4)	0.0
Operating expense	72.0	71.2
Operating profit (loss)	(27.8)	(20.3)
Other income (expense)
Interest income	0.2	0.6
Interest expense	(24.8)	(29.1)
Foreign exchange gain (loss), net	(3.0)	0.0
Equity in earnings of investees	(42.8)	(25.5)
Miscellaneous, net	(1.3)	(0.1)
Income (loss) from continuing operations before taxes	(99.5)	(74.4)
Income tax expense (benefit)	(28.6)	(15.6)
Net income (loss)	(70.9)	(58.8)
Net income attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	(70.9)	(58.8)
Comprehensive income (loss)	(80.1)	(13.9)
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(80.1)	(13.9)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Total net sales	0.2	4.9
Cost of sales	0.4	5.9
Gross profit	(0.2)	(1.0)
Selling and administrative expense	1.1	2.9
Research, development and engineering expense	11.3	9.8
(Gain) loss on sale of assets, net	0.0	0.1
Operating expense	12.4	12.8
Operating profit (loss)	(12.6)	(13.8)
Other income (expense)
Interest income	0.0	0.1
Interest expense	0.0	0.0
Foreign exchange gain (loss), net	0.0	0.0
Equity in earnings of investees	0.0	0.0
Miscellaneous, net	1.4	1.9
Income (loss) from continuing operations before taxes	(11.2)	(11.8)
Income tax expense (benefit)	(20.6)	(4.1)
Net income (loss)	9.4	(7.7)
Net income attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	9.4	(7.7)
Comprehensive income (loss)	9.4	(7.7)
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	9.4	(7.7)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Total net sales	811.5	834.8
Cost of sales	614.6	642.2
Gross profit	196.9	192.6
Selling and administrative expense	151.1	175.9
Research, development and engineering expense	29.7	31.7
(Gain) loss on sale of assets, net	(3.3)	(0.5)
Operating expense	177.5	207.1
Operating profit (loss)	19.4	(14.5)
Other income (expense)
Interest income	3.3	5.7
Interest expense	(1.2)	(1.7)
Foreign exchange gain (loss), net	1.6	(3.1)
Equity in earnings of investees	0.0	0.0
Miscellaneous, net	0.1	0.5
Income (loss) from continuing operations before taxes	23.2	(13.1)
Income tax expense (benefit)	68.6	(2.9)
Net income (loss)	(45.4)	(10.2)
Net income attributable to noncontrolling interests	7.6	6.6
Net income (loss) attributable to Diebold Nixdorf, Incorporated	(53.0)	(16.8)
Comprehensive income (loss)	(14.4)	46.2
Less: comprehensive income attributable to noncontrolling interests	7.6	6.6
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	(22.0)	39.6
Consolidation, Eliminations [Member]
Total net sales	0.0	(4.3)
Cost of sales	0.0	(4.3)
Gross profit	0.0	0.0
Selling and administrative expense	0.0	0.0
Research, development and engineering expense	0.0	0.0
(Gain) loss on sale of assets, net	0.0	0.0
Operating expense	0.0	0.0
Operating profit (loss)	0.0	0.0
Other income (expense)
Interest income	0.0	0.0
Interest expense	0.0	0.0
Foreign exchange gain (loss), net	0.0	0.0
Equity in earnings of investees	42.8	25.5
Miscellaneous, net	0.8	(1.0)
Income (loss) from continuing operations before taxes	43.6	24.5
Income tax expense (benefit)	0.0	0.0
Net income (loss)	43.6	24.5
Net income attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	43.6	24.5
Comprehensive income (loss)	12.6	(31.9)
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0
Comprehensive income (loss) attributable to Diebold Nixdorf, Incorporated	$ 12.6	$ (31.9)