Supplemental Guarantor Information (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash, cash equivalents, and restricted cash	$ 458.4	$ 543.2	$ 652.7	$ 313.6
Short-term investments	33.5	81.4
Trade receivables, net	737.2	827.9
Intercompany receivables	0.0	0.0
Inventories	610.1	714.5
Prepaid expenses	57.4	65.7
Other current assets	306.8	247.5
Total current assets	2,203.4	2,480.2
Securities and other investments	22.4	96.8
Property, plant and equipment, net	304.1	364.5	387.0
Goodwill	827.1	1,117.1	998.3
Deferred income taxes	243.9	293.8
Intangible assets, net	624.6	773.8
Investment in subsidiary	0.0	0.0
Other assets	86.4	95.8
Assets	4,311.9	5,222.0
Notes payable	49.5	66.7
Accounts payable	509.5	562.2
Intercompany payable	0.0	0.0
Deferred revenue	378.2	436.5
Payroll and other benefits liabilities	184.3	198.9
Other current liabilities	446.9	531.4
Total current liabilities	1,568.4	1,795.7
Long-term debt	2,190.0	1,787.1
Pensions, post-retirement and other benefits	273.8	266.4
Deferred income taxes	221.6	287.1
Other liabilities	87.3	111.3
Commitments and contingencies
Redeemable noncontrolling interests	130.4	492.1	44.1	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(186.4)	445.5
Noncontrolling interests	26.8	36.8
Total liabilities and equity	4,311.9	5,222.0
Consolidation, Eliminations [Member]
Cash, cash equivalents, and restricted cash	0.0	0.0	0.0	0.0
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.0
Intercompany receivables	(1,236.7)	(1,129.1)
Inventories	0.0	0.0
Prepaid expenses	0.0	0.0
Other current assets	(25.7)	(21.8)
Total current assets	(1,262.4)	(1,150.9)
Securities and other investments	0.0	0.0
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Deferred income taxes	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiary	(2,702.1)	(2,810.9)
Other assets	(13.5)	(26.5)
Assets	(3,978.0)	(3,988.3)
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	(1,236.7)	(1,129.1)
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	0.0
Other current liabilities	(21.2)	(21.8)
Total current liabilities	(1,257.9)	(1,150.9)
Long-term debt	0.0	0.0
Pensions, post-retirement and other benefits	0.0	0.0
Deferred income taxes	0.0	0.0
Other liabilities	(18.0)	(26.5)
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(2,702.1)	(2,810.9)
Noncontrolling interests	0.0	0.0
Total liabilities and equity	(3,978.0)	(3,988.3)
Reportable Legal Entities [Member] | Parent Company [Member]
Cash, cash equivalents, and restricted cash	17.3	58.5	138.9	20.3
Short-term investments	0.0	0.0
Trade receivables, net	105.7	140.7
Intercompany receivables	205.3	106.7
Inventories	164.8	159.4
Prepaid expenses	16.4	15.7
Other current assets	20.4	19.7
Total current assets	529.9	500.7
Securities and other investments	22.4	96.8
Property, plant and equipment, net	76.9	89.6
Goodwill	58.1	55.5
Deferred income taxes	139.9	150.8
Intangible assets, net	30.8	37.5
Investment in subsidiary	2,702.1	2,810.9
Other assets	30.2	47.2
Assets	3,590.3	3,789.0
Notes payable	25.7	49.9
Accounts payable	88.1	88.1
Intercompany payable	1,030.8	1,019.5
Deferred revenue	116.6	115.8
Payroll and other benefits liabilities	26.7	26.1
Other current liabilities	114.2	112.4
Total current liabilities	1,402.1	1,411.8
Long-term debt	2,172.5	1,710.6
Pensions, post-retirement and other benefits	183.7	199.7
Deferred income taxes	10.0	10.0
Other liabilities	8.4	11.4
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(186.4)	445.5
Noncontrolling interests	0.0	0.0
Total liabilities and equity	3,590.3	3,789.0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash, cash equivalents, and restricted cash	2.7	2.3	2.3	7.9
Short-term investments	0.0	0.0
Trade receivables, net	0.1	1.4
Intercompany receivables	606.3	638.4
Inventories	0.0	0.0
Prepaid expenses	0.1	1.0
Other current assets	12.5	16.0
Total current assets	621.7	659.1
Securities and other investments	0.0	0.0
Property, plant and equipment, net	0.8	2.1
Goodwill	0.0	0.0
Deferred income taxes	6.2	8.0
Intangible assets, net	0.0	0.0
Investment in subsidiary	0.0	0.0
Other assets	0.4	1.1
Assets	629.1	670.3
Notes payable	0.1	0.3
Accounts payable	0.0	0.1
Intercompany payable	60.8	22.2
Deferred revenue	0.1	0.6
Payroll and other benefits liabilities	1.3	2.2
Other current liabilities	1.5	2.8
Total current liabilities	63.8	28.2
Long-term debt	0.0	0.1
Pensions, post-retirement and other benefits	0.0	0.0
Deferred income taxes	0.0	0.0
Other liabilities	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	565.3	642.0
Noncontrolling interests	0.0	0.0
Total liabilities and equity	629.1	670.3
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash, cash equivalents, and restricted cash	438.4	482.4	$ 511.5	$ 285.4
Short-term investments	33.5	81.4
Trade receivables, net	631.4	685.8
Intercompany receivables	425.1	384.0
Inventories	445.3	555.1
Prepaid expenses	40.9	49.0
Other current assets	299.6	233.6
Total current assets	2,314.2	2,471.3
Securities and other investments	0.0	0.0
Property, plant and equipment, net	226.4	272.8
Goodwill	769.0	1,061.6
Deferred income taxes	97.8	135.0
Intangible assets, net	593.8	736.3
Investment in subsidiary	0.0	0.0
Other assets	69.3	74.0
Assets	4,070.5	4,751.0
Notes payable	23.7	16.5
Accounts payable	421.4	474.0
Intercompany payable	145.1	87.4
Deferred revenue	261.5	320.1
Payroll and other benefits liabilities	156.3	170.6
Other current liabilities	352.4	438.0
Total current liabilities	1,360.4	1,506.6
Long-term debt	17.5	76.4
Pensions, post-retirement and other benefits	90.1	66.7
Deferred income taxes	211.6	277.1
Other liabilities	96.9	126.4
Redeemable noncontrolling interests	130.4	492.1
Total Diebold Nixdorf, Incorporated shareholders' equity	2,136.8	2,168.9
Noncontrolling interests	26.8	36.8
Total liabilities and equity	$ 4,070.5	$ 4,751.0