Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 910.7	$ 1,028.1
Total cost of sales	683.9	782.0
Gross profit	226.8	246.1
Selling and administrative expense	222.1	230.3
Research, development and engineering expense	32.5	36.9
(Gain) loss on sale of assets, net	(1.8)	3.4
Operating expense	252.8	270.6
Operating profit (loss)	(26.0)	(24.5)
Other income (expense)
Interest income	1.1	2.9
Interest expense	(48.0)	(50.9)
Foreign exchange gain, net	0.4	2.8
Miscellaneous, net	(0.9)	(1.4)
Income (loss) from continuing operations before taxes	(73.4)	(71.1)
Income tax expense	20.0	60.4
Equity in earnings of unconsolidated subsidiaries	0.0	(0.4)
Net loss	(93.4)	(131.9)
Net (loss) income attributable to noncontrolling interests	(0.6)	0.8
Net loss attributable to Diebold Nixdorf, Incorporated	(92.8)	(132.7)
Comprehensive income (loss)	(198.9)	(131.1)
Less: comprehensive (loss) income attributable to noncontrolling interests	(1.9)	3.5
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(197.0)	(134.6)
Reportable Legal Entities [Member] | Parent Company [Member]
Net sales	269.4	295.5
Total cost of sales	188.4	243.0
Gross profit	81.0	52.5
Selling and administrative expense	111.5	84.0
Research, development and engineering expense	5.1	1.2
(Gain) loss on sale of assets, net	0.0	0.0
Operating expense	116.6	85.2
Operating profit (loss)	(35.6)	(32.7)
Other income (expense)
Interest income	0.0	0.9
Interest expense	(45.6)	(47.5)
Foreign exchange gain, net	(4.8)	(1.4)
Miscellaneous, net	21.7	12.6
Income (loss) from continuing operations before taxes	(64.3)	(68.1)
Income tax expense	4.4	41.0
Equity in earnings of unconsolidated subsidiaries	(24.1)	(23.6)
Net loss	(92.8)	(132.7)
Net (loss) income attributable to noncontrolling interests	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(92.8)	(132.7)
Comprehensive income (loss)	(197.0)	(133.8)
Less: comprehensive (loss) income attributable to noncontrolling interests	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(197.0)	(133.8)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net sales	0.0	0.1
Total cost of sales	0.0	0.2
Gross profit	0.0	(0.1)
Selling and administrative expense	0.2	1.1
Research, development and engineering expense	2.8	8.8
(Gain) loss on sale of assets, net	0.0	0.0
Operating expense	3.0	9.9
Operating profit (loss)	(3.0)	(10.0)
Other income (expense)
Interest income	0.0	0.0
Interest expense	0.0	0.0
Foreign exchange gain, net	0.0	0.0
Miscellaneous, net	0.2	0.3
Income (loss) from continuing operations before taxes	(2.8)	(9.7)
Income tax expense	(2.0)	(6.4)
Equity in earnings of unconsolidated subsidiaries	0.0	(1.0)
Net loss	(0.8)	(4.3)
Net (loss) income attributable to noncontrolling interests	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(0.8)	(4.3)
Comprehensive income (loss)	(0.8)	(4.3)
Less: comprehensive (loss) income attributable to noncontrolling interests	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(0.8)	(4.3)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net sales	701.8	851.3
Total cost of sales	549.0	648.9
Gross profit	152.8	202.4
Selling and administrative expense	110.4	145.2
Research, development and engineering expense	30.0	31.5
(Gain) loss on sale of assets, net	(1.8)	3.4
Operating expense	138.6	180.1
Operating profit (loss)	14.2	22.3
Other income (expense)
Interest income	1.1	2.0
Interest expense	(2.4)	(3.4)
Foreign exchange gain, net	5.2	4.2
Miscellaneous, net	(23.4)	(11.5)
Income (loss) from continuing operations before taxes	(5.3)	13.6
Income tax expense	17.6	25.8
Equity in earnings of unconsolidated subsidiaries	0.0	(0.4)
Net loss	(22.9)	(12.6)
Net (loss) income attributable to noncontrolling interests	(0.6)	0.8
Net loss attributable to Diebold Nixdorf, Incorporated	(22.3)	(13.4)
Comprehensive income (loss)	(95.7)	(21.9)
Less: comprehensive (loss) income attributable to noncontrolling interests	(1.9)	3.5
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(93.8)	(25.4)
Consolidation, Eliminations [Member]
Net sales	(60.5)	(118.8)
Total cost of sales	(53.5)	(110.1)
Gross profit	(7.0)	(8.7)
Selling and administrative expense	0.0	0.0
Research, development and engineering expense	(5.4)	(4.6)
(Gain) loss on sale of assets, net	0.0	0.0
Operating expense	(5.4)	(4.6)
Operating profit (loss)	(1.6)	(4.1)
Other income (expense)
Interest income	0.0	0.0
Interest expense	0.0	0.0
Foreign exchange gain, net	0.0	0.0
Miscellaneous, net	0.6	(2.8)
Income (loss) from continuing operations before taxes	(1.0)	(6.9)
Income tax expense	0.0	0.0
Equity in earnings of unconsolidated subsidiaries	24.1	24.6
Net loss	23.1	17.7
Net (loss) income attributable to noncontrolling interests	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	23.1	17.7
Comprehensive income (loss)	94.6	28.9
Less: comprehensive (loss) income attributable to noncontrolling interests	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	$ 94.6	$ 28.9