Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash, cash equivalents and restricted cash	$ 252.3	$ 458.4
Short-term investments	8.2	33.5
Trade receivables, net	603.4	737.2
Intercompany receivables	0.0	0.0
Inventories	591.0	610.1
Prepaid, income taxes and other current assets	415.5	364.2
Total current assets	1,870.4	2,203.4
Securities and other investments	14.3	22.4
Property, plant and equipment, net	254.5	304.1
Goodwill	773.4	827.1		$ 1,117.1
Deferred income taxes	198.2	243.9
Intangible assets, net	521.9	624.6
Right-of-use operating lease assets	169.1	0.0
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	87.3	86.4
Assets	3,889.1	4,311.9
Current liabilities
Notes payable	53.1	49.5
Accounts payable	485.0	509.5
Intercompany payable	0.0	0.0
Deferred revenue	318.6	378.2
Payroll and other benefits liabilities	187.1	184.3
Operating lease liabilities	63.2	0.0
Other current liabilities	439.1	446.9
Total current liabilities	1,546.1	1,568.4
Long-term debt	2,100.3	2,190.0
Long-term intercompany payable	0.0
Other long-term liabilities	646.4	582.7
Redeemable noncontrolling interests	21.5	130.4	$ 154.2	$ 492.1
Total Diebold Nixdorf, Incorporated shareholders' equity	(449.9)	(186.4)
Noncontrolling interests	24.7	26.8
Total liabilities, redeemable noncontrolling interests and equity	3,889.1	4,311.9
Reportable Legal Entities [Member] | Parent Company [Member]
Cash, cash equivalents and restricted cash	17.1	17.3
Short-term investments	0.0	0.0
Trade receivables, net	103.0	105.7
Intercompany receivables	556.4	205.3
Inventories	152.6	164.8
Prepaid, income taxes and other current assets	24.5	36.8
Total current assets	853.6	529.9
Securities and other investments	14.3	22.4
Property, plant and equipment, net	66.8	76.9
Goodwill	55.5	58.1
Deferred income taxes	111.6	139.9
Intangible assets, net	25.5	30.8
Right-of-use operating lease assets	41.2
Investment in subsidiary	1,732.0	2,702.1
Long-term intercompany receivables	598.9
Other assets	2.0	30.2
Assets	3,501.4	3,590.3
Current liabilities
Notes payable	43.2	25.7
Accounts payable	80.0	88.1
Intercompany payable	1,206.4	1,030.8
Deferred revenue	109.9	116.6
Payroll and other benefits liabilities	41.6	26.7
Operating lease liabilities	17.5
Other current liabilities	138.5	114.2
Total current liabilities	1,637.1	1,402.1
Long-term debt	2,099.2	2,172.5
Long-term intercompany payable	0.0
Other long-term liabilities	215.0	202.1
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(449.9)	(186.4)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	3,501.4	3,590.3
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash, cash equivalents and restricted cash	1.9	2.7
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.1
Intercompany receivables	568.1	606.3
Inventories	0.0	0.0
Prepaid, income taxes and other current assets	12.4	12.7
Total current assets	582.4	621.8
Securities and other investments	0.0	0.0
Property, plant and equipment, net	0.6	0.8
Goodwill	0.0	0.0
Deferred income taxes	6.2	6.2
Intangible assets, net	0.0	0.0
Right-of-use operating lease assets	0.0
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	0.2	0.4
Assets	589.4	629.2
Current liabilities
Notes payable	0.0	0.1
Accounts payable	0.0	0.0
Intercompany payable	21.2	60.8
Deferred revenue	0.0	0.1
Payroll and other benefits liabilities	2.0	1.3
Operating lease liabilities	0.0
Other current liabilities	0.8	1.6
Total current liabilities	24.0	63.9
Long-term debt	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	565.4	565.3
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	589.4	629.2
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash, cash equivalents and restricted cash	233.3	438.4
Short-term investments	8.2	33.5
Trade receivables, net	500.4	631.4
Intercompany receivables	638.4	425.1
Inventories	440.0	447.5
Prepaid, income taxes and other current assets	390.8	340.5
Total current assets	2,211.1	2,316.4
Securities and other investments	0.0	0.0
Property, plant and equipment, net	187.1	226.4
Goodwill	717.9	769.0
Deferred income taxes	80.4	97.8
Intangible assets, net	496.4	593.8
Right-of-use operating lease assets	127.9
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	85.1	69.3
Assets	3,905.9	4,072.7
Current liabilities
Notes payable	9.9	23.7
Accounts payable	405.0	421.4
Intercompany payable	535.3	145.1
Deferred revenue	208.7	261.5
Payroll and other benefits liabilities	143.5	156.3
Operating lease liabilities	45.7
Other current liabilities	312.0	352.4
Total current liabilities	1,660.1	1,360.4
Long-term debt	1.1	17.5
Long-term intercompany payable	598.9
Other long-term liabilities	431.4	398.6
Redeemable noncontrolling interests	21.5	130.4
Total Diebold Nixdorf, Incorporated shareholders' equity	1,168.2	2,139.0
Noncontrolling interests	24.7	26.8
Total liabilities, redeemable noncontrolling interests and equity	3,905.9	4,072.7
Consolidation, Eliminations [Member]
Cash, cash equivalents and restricted cash	0.0	0.0
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.0
Intercompany receivables	(1,762.9)	(1,236.7)
Inventories	(1.6)	(2.2)
Prepaid, income taxes and other current assets	(12.2)	(25.8)
Total current assets	(1,776.7)	(1,264.7)
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
Right-of-use operating lease assets	0.0
Investment in subsidiary	(1,732.0)	(2,702.1)
Long-term intercompany receivables	(598.9)
Other assets	0.0	(13.5)
Assets	(4,107.6)	(3,980.3)
Current liabilities
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	(1,762.9)	(1,236.7)
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	0.0
Operating lease liabilities	0.0
Other current liabilities	(12.2)	(21.3)
Total current liabilities	(1,775.1)	(1,258.0)
Long-term debt	0.0	0.0
Long-term intercompany payable	(598.9)
Other long-term liabilities	0.0	(18.0)
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(1,733.6)	(2,704.3)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	$ (4,107.6)	$ (3,980.3)