Supplemental Guarantor Information (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash, cash equivalents, and restricted cash	$ 280.9	$ 458.4	$ 543.2	$ 652.7
Short-term investments	10.0	33.5
Trade receivables, net	619.3	737.2	827.9
Intercompany receivables	0.0	0.0
Inventories	466.5	610.1
Prepaid expenses	51.3	57.4
Other current assets	464.0	304.3
Total current assets	1,892.0	2,200.9
Securities and other investments	21.4	22.4
Property, plant and equipment, net	231.5	304.1
Deferred income taxes	120.8	243.9
Goodwill	764.0	798.2	1,045.7
Other intangible assets, net	502.3	624.6
Investment in subsidiaries	0.0	0.0
Other Assets, Noncurrent	91.1	86.4
Long-term intercompany receivables	0.0
Other assets	258.6
Total assets	(3,790.6)	(4,280.5)
Notes payable	32.5	49.5
Accounts payable	471.5	509.5
Intercompany payable	0.0	0.0
Deferred revenue	320.5	378.2	436.5
Payroll and other benefits liabilities	224.7	184.3
Other Liabilities, Current, Including Liabilities Held For Sale	550.4	446.9
Total current liabilities	1,599.6	1,568.4
Long-term debt	2,108.7	2,190.0
Pensions, post-retirement and other benefits	237.7	273.8
Long-term intercompany payable	0.0
Other long-term liabilities	330.0	240.8
Commitments and contingencies
Redeemable noncontrolling interests	20.9	130.4	492.1	44.1
Total Diebold Nixdorf, Incorporated shareholders' equity	(530.3)	(149.7)
Noncontrolling interests	24.0	26.8
Total liabilities, redeemable noncontrolling interests and equity	3,790.6	4,280.5
Reportable Legal Entities [Member] | Parent Company [Member]
Cash, cash equivalents, and restricted cash	3.6	17.3	58.5	138.9
Short-term investments	0.0	0.0
Trade receivables, net	109.0	105.7
Intercompany receivables	632.6	205.3
Inventories	122.4	164.8
Prepaid expenses	27.2	16.4
Other current assets	14.9	20.4
Total current assets	909.7	529.9
Securities and other investments	21.4	22.4
Property, plant and equipment, net	61.9	76.9
Deferred income taxes	51.1	139.9
Goodwill	55.5	58.1
Other intangible assets, net	19.2	30.8
Investment in subsidiaries	1,676.8	2,738.8
Other Assets, Noncurrent		30.2
Long-term intercompany receivables	617.9
Other assets	45.1
Total assets	(3,458.6)	(3,627.0)
Notes payable	26.6	25.7
Accounts payable	55.3	88.1
Intercompany payable	1,302.3	1,030.8
Deferred revenue	133.7	116.6
Payroll and other benefits liabilities	49.4	26.7
Other Liabilities, Current, Including Liabilities Held For Sale	109.5	114.2
Total current liabilities	1,676.8	1,402.1
Long-term debt	2,107.4	2,172.5
Pensions, post-retirement and other benefits	160.3	183.7
Long-term intercompany payable	0.0
Other long-term liabilities	42.7	18.4
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(528.6)	(149.7)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	3,458.6	3,627.0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash, cash equivalents, and restricted cash	1.8	2.7	2.3	2.3
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.1
Intercompany receivables	559.3	606.3
Inventories	0.0	0.0
Prepaid expenses	0.0	0.1
Other current assets	7.8	12.6
Total current assets	568.9	621.8
Securities and other investments	0.0	0.0
Property, plant and equipment, net	0.5	0.8
Deferred income taxes	6.4	6.2
Goodwill	0.0	0.0
Other intangible assets, net	0.0	0.0
Investment in subsidiaries	0.0	0.0
Other Assets, Noncurrent		0.4
Long-term intercompany receivables	0.0
Other assets	0.1
Total assets	(575.9)	(629.2)
Notes payable	0.0	0.1
Accounts payable	0.0	0.0
Intercompany payable	46.7	60.8
Deferred revenue	0.0	0.1
Payroll and other benefits liabilities	2.1	1.3
Other Liabilities, Current, Including Liabilities Held For Sale	1.0	1.6
Total current liabilities	49.8	63.9
Long-term debt	0.0	0.0
Pensions, post-retirement and other benefits	0.0	0.0
Long-term intercompany payable	0.0
Other long-term liabilities	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	526.1	565.3
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	575.9	629.2
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash, cash equivalents, and restricted cash	275.5	438.4	482.4	511.5
Short-term investments	10.0	33.5
Trade receivables, net	510.3	631.4
Intercompany receivables	747.6	425.1
Inventories	346.4	447.5
Prepaid expenses	24.1	40.9
Other current assets	449.1	297.1
Total current assets	2,363.0	2,313.9
Securities and other investments	0.0	0.0
Property, plant and equipment, net	169.1	226.4
Deferred income taxes	63.3	97.8
Goodwill	708.5	740.1
Other intangible assets, net	483.1	593.8
Investment in subsidiaries	0.0	0.0
Other Assets, Noncurrent		69.3
Long-term intercompany receivables	0.0
Other assets	213.4
Total assets	(4,000.4)	(4,041.3)
Notes payable	5.9	23.7
Accounts payable	416.2	421.4
Intercompany payable	590.5	145.1
Deferred revenue	186.8	261.5
Payroll and other benefits liabilities	173.2	156.3
Other Liabilities, Current, Including Liabilities Held For Sale	447.7	352.4
Total current liabilities	1,820.3	1,360.4
Long-term debt	1.3	17.5
Pensions, post-retirement and other benefits	77.4	90.1
Long-term intercompany payable	617.9
Other long-term liabilities	287.3	240.4
Redeemable noncontrolling interests	20.9	130.4
Total Diebold Nixdorf, Incorporated shareholders' equity	1,151.3	2,175.7
Noncontrolling interests	24.0	26.8
Total liabilities, redeemable noncontrolling interests and equity	4,000.4	4,041.3
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	(1,939.5)	(1,236.7)
Inventories	(2.3)	(2.2)
Prepaid expenses	0.0	0.0
Other current assets	(7.8)	(25.8)
Total current assets	(1,949.6)	(1,264.7)
Securities and other investments	0.0	0.0
Property, plant and equipment, net	0.0	0.0
Deferred income taxes	0.0	0.0
Goodwill	0.0	0.0
Other intangible assets, net	0.0	0.0
Investment in subsidiaries	(1,676.8)	(2,738.8)
Other Assets, Noncurrent		(13.5)
Long-term intercompany receivables	(617.9)
Other assets	0.0
Total assets	4,244.3	4,017.0
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	(1,939.5)	(1,236.7)
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	0.0
Other Liabilities, Current, Including Liabilities Held For Sale	(7.8)	(21.3)
Total current liabilities	(1,947.3)	(1,258.0)
Long-term debt	0.0	0.0
Pensions, post-retirement and other benefits	0.0	0.0
Long-term intercompany payable	(617.9)
Other long-term liabilities	0.0	(18.0)
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(1,679.1)	(2,741.0)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	$ (4,244.3)	$ (4,017.0)