Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 1,028.1	$ 1,064.2
Total cost of sales	784.0	825.8
Gross profit	244.1	238.4
Selling and administrative expense	228.3	227.9
Research, development and engineering expense	36.9	41.7
Loss (gain) on sale of assets, net	3.4	(7.7)
Operating expense	268.6	261.9
Operating profit (loss)	(24.5)	(23.5)
Other income (expense)
Interest income	2.9	3.5
Interest expense	(50.9)	(26.0)
Foreign exchange gain (loss), net	2.8	(1.4)
Miscellaneous, net	(1.4)	(0.1)
Income (loss) from continuing operations before taxes	(71.1)	(47.5)
Income tax expense	60.4	19.2
Equity in earnings of investees	(0.4)	1.1
Net loss	(131.9)	(65.6)
Net income attributable to noncontrolling interests	0.8	7.6
Net loss attributable to Diebold Nixdorf, Incorporated	(132.7)	(73.2)
Comprehensive income (loss)	(130.3)	(74.8)
Less: comprehensive income attributable to noncontrolling interests	3.5	7.6
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(133.8)	(82.4)
Reportable Legal Entities [Member] | Parent Company [Member]
Revenues	295.5	252.5
Total cost of sales	243.0	208.9
Gross profit	52.5	43.6
Selling and administrative expense	84.0	75.7
Research, development and engineering expense	1.2	0.7
Loss (gain) on sale of assets, net	0.0	(4.4)
Operating expense	85.2	72.0
Operating profit (loss)	(32.7)	(28.4)
Other income (expense)
Interest income	0.9	0.2
Interest expense	(47.5)	(24.8)
Foreign exchange gain (loss), net	(1.4)	(3.0)
Miscellaneous, net	12.6	(1.3)
Income (loss) from continuing operations before taxes	(68.1)	(57.3)
Income tax expense	41.0	(28.6)
Equity in earnings of investees	(23.6)	(44.5)
Net loss	(132.7)	(73.2)
Net income attributable to noncontrolling interests	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(132.7)	(73.2)
Comprehensive income (loss)	(133.8)	(82.4)
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(133.8)	(82.4)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Revenues	0.1	0.2
Total cost of sales	0.2	0.4
Gross profit	(0.1)	(0.2)
Selling and administrative expense	1.1	1.2
Research, development and engineering expense	8.8	11.3
Loss (gain) on sale of assets, net	0.0	0.0
Operating expense	9.9	12.5
Operating profit (loss)	(10.0)	(12.7)
Other income (expense)
Interest income	0.0	0.0
Interest expense	0.0	0.0
Foreign exchange gain (loss), net	0.0	0.0
Miscellaneous, net	0.3	1.5
Income (loss) from continuing operations before taxes	(9.7)	(11.2)
Income tax expense	(6.4)	(20.6)
Equity in earnings of investees	(1.0)	0.0
Net loss	(4.3)	9.4
Net income attributable to noncontrolling interests	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(4.3)	9.4
Comprehensive income (loss)	(4.3)	9.4
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(4.3)	9.4
Reportable Legal Entities [Member] | Foreign Guarantor Subsidiary [Member]
Revenues	0.0	0.0
Total cost of sales	0.0	0.0
Gross profit		0.0
Selling and administrative expense	0.0	0.2
Research, development and engineering expense	0.0	0.0
Loss (gain) on sale of assets, net	0.0	0.0
Operating expense	0.0	0.2
Operating profit (loss)	0.0	(0.2)
Other income (expense)
Interest income	0.0	0.0
Interest expense	0.0	0.0
Foreign exchange gain (loss), net	0.0	0.0
Miscellaneous, net	(1.7)	(0.9)
Income (loss) from continuing operations before taxes	(1.7)	(1.1)
Income tax expense	0.7	1.9
Equity in earnings of investees	19.8	8.7
Net loss	17.4	5.7
Net income attributable to noncontrolling interests	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	17.4	5.7
Comprehensive income (loss)	19.5	5.7
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	19.5	5.7
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Revenues	851.3	864.6
Total cost of sales	650.9	658.4
Gross profit	200.4	206.2
Selling and administrative expense	143.2	150.8
Research, development and engineering expense	31.5	35.3
Loss (gain) on sale of assets, net	3.4	(3.3)
Operating expense	178.1	182.8
Operating profit (loss)	22.3	23.4
Other income (expense)
Interest income	2.0	3.3
Interest expense	(3.4)	(1.2)
Foreign exchange gain (loss), net	4.2	1.6
Miscellaneous, net	(9.8)	0.6
Income (loss) from continuing operations before taxes	15.3	27.7
Income tax expense	25.1	66.5
Equity in earnings of investees	(0.4)	1.1
Net loss	(10.2)	(37.7)
Net income attributable to noncontrolling interests	0.8	7.6
Net loss attributable to Diebold Nixdorf, Incorporated	(11.0)	(45.3)
Comprehensive income (loss)	(40.6)	(7.6)
Less: comprehensive income attributable to noncontrolling interests	3.5	7.6
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	(44.1)	(15.2)
Consolidation, Eliminations [Member]
Revenues	(118.8)	(53.1)
Total cost of sales	(110.1)	(41.9)
Gross profit	(8.7)	(11.2)
Selling and administrative expense	0.0	0.0
Research, development and engineering expense	(4.6)	(5.6)
Loss (gain) on sale of assets, net	0.0	0.0
Operating expense	(4.6)	(5.6)
Operating profit (loss)	(4.1)	(5.6)
Other income (expense)
Interest income	0.0	0.0
Interest expense	0.0	0.0
Foreign exchange gain (loss), net	0.0	0.0
Miscellaneous, net	(2.8)	0.0
Income (loss) from continuing operations before taxes	(6.9)	(5.6)
Income tax expense	0.0	0.0
Equity in earnings of investees	4.8	35.8
Net loss	(2.1)	30.2
Net income attributable to noncontrolling interests	0.0	0.0
Net loss attributable to Diebold Nixdorf, Incorporated	(2.1)	30.2
Comprehensive income (loss)	28.9	0.1
Less: comprehensive income attributable to noncontrolling interests	0.0	0.0
Comprehensive loss attributable to Diebold Nixdorf, Incorporated	$ 28.9	$ 0.1