Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 259.8	$ 458.4
Short-term investments	13.1	33.5
Trade receivables, net	712.5	737.2
Intercompany receivables	0.0	0.0
Inventories	607.4	610.1
Prepaid expenses	52.8	57.4
Prepaid, income taxes and other current assets	344.4	364.2
Total current assets	1,937.2	2,203.4
Securities and other investments	17.6	22.4
Property, plant and equipment, net	277.2	304.1
Goodwill	823.6	827.1		$ 1,117.1
Deferred income taxes	214.5	243.9
Intangible assets, net	570.9	624.6
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	98.2	86.4
Other Long-Term Assets	263.5
Assets	4,104.5	4,311.9
Liabilities, Current [Abstract]
Notes payable	42.2	49.5
Accounts payable	509.0	509.5
Intercompany payable	0.0	0.0
Deferred revenue	368.9	378.2
Payroll and other benefits liabilities	165.6	184.3
Other current liabilities	483.4	446.9
Total current liabilities	1,569.1	1,568.4
Long-term debt	2,174.1	2,190.0
Long-term intercompany payable	0.0
Other long-term liabilities	643.6	582.7
Commitments and contingencies
Redeemable noncontrolling interests	21.7	130.4	$ 468.6	$ 492.1
Total Diebold Nixdorf, Incorporated shareholders' equity	(328.8)	(186.4)
Noncontrolling interests	24.8	26.8
Total liabilities, redeemable noncontrolling interests and equity	4,104.5	4,311.9
Reportable Legal Entities [Member] | Parent Company [Member]
Cash and cash equivalents	10.0	17.3
Short-term investments	0.0	0.0
Trade receivables, net	108.6	105.7
Intercompany receivables	589.9	205.3
Inventories	148.8	164.8
Prepaid, income taxes and other current assets	23.7	36.8
Total current assets	881.0	529.9
Securities and other investments	17.6	22.4
Property, plant and equipment, net	70.5	76.9
Goodwill	55.5	58.1
Deferred income taxes	113.3	139.9
Intangible assets, net	27.8	30.8
Investment in subsidiary	1,763.3	2,702.1
Long-term intercompany receivables	625.9
Other assets		30.2
Other Long-Term Assets	51.1
Assets	3,606.0	3,590.3
Liabilities, Current [Abstract]
Notes payable	26.8	25.7
Accounts payable	93.0	88.1
Intercompany payable	1,192.6	1,030.8
Deferred revenue	117.4	116.6
Payroll and other benefits liabilities	24.0	26.7
Other current liabilities	125.0	114.2
Total current liabilities	1,578.8	1,402.1
Long-term debt	2,142.7	2,172.5
Long-term intercompany payable	0.0
Other long-term liabilities	213.3	202.1
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(328.8)	(186.4)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	3,606.0	3,590.3
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash and cash equivalents	1.9	2.7
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.1
Intercompany receivables	575.4	606.3
Inventories	0.0	0.0
Prepaid, income taxes and other current assets	12.5	12.7
Total current assets	589.8	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
Investment in subsidiary	0.0	(0.6)
Long-term intercompany receivables	0.0
Other assets		0.4
Other Long-Term Assets	0.3
Assets	596.9	628.6
Liabilities, Current [Abstract]
Notes payable	0.0	0.1
Accounts payable	0.1	0.0
Intercompany payable	46.4	60.8
Deferred revenue	0.0	0.1
Payroll and other benefits liabilities	1.0	1.3
Other current liabilities	0.5	1.5
Total current liabilities	48.0	63.8
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	548.9	564.8
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	596.9	628.6
Reportable Legal Entities [Member] | Foreign Guarantor Subsidiary [Member]
Cash and cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.0
Intercompany receivables	0.0	0.0
Inventories	0.0	0.0
Prepaid, income taxes and other current assets	0.0	0.0
Total current assets	0.0	0.0
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	1,103.0	1,129.0
Long-term intercompany receivables	0.0
Other assets		0.0
Other Long-Term Assets	0.0
Assets	1,103.0	1,129.0
Liabilities, Current [Abstract]
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	123.6	120.1
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	0.0
Other current liabilities	0.0	0.0
Total current liabilities	123.6	120.1
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	979.4	1,008.9
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	1,103.0	1,129.0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	247.9	438.4
Short-term investments	13.1	33.5
Trade receivables, net	603.9	631.4
Intercompany receivables	731.0	536.5
Inventories	460.2	447.5
Prepaid, income taxes and other current assets	320.4	340.5
Total current assets	2,376.5	2,427.8
Securities and other investments	0.0	0.0
Property, plant and equipment, net	206.1	226.4
Goodwill	768.1	769.0
Deferred income taxes	95.0	97.8
Intangible assets, net	543.1	593.8
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets		69.3
Other Long-Term Assets	212.1
Assets	4,200.9	4,184.1
Liabilities, Current [Abstract]
Notes payable	15.4	23.7
Accounts payable	415.9	421.4
Intercompany payable	533.7	136.4
Deferred revenue	251.5	261.5
Payroll and other benefits liabilities	140.6	156.3
Other current liabilities	370.1	352.4
Total current liabilities	1,727.2	1,351.7
Long-term debt	31.4	17.5
Long-term intercompany payable	625.9
Other long-term liabilities	430.3	398.6
Redeemable noncontrolling interests	21.7	130.4
Total Diebold Nixdorf, Incorporated shareholders' equity	1,339.6	2,259.1
Noncontrolling interests	24.8	26.8
Total liabilities, redeemable noncontrolling interests and equity	4,200.9	4,184.1
Consolidation, Eliminations [Member]
Cash and cash equivalents	0.0	0.0
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.0
Intercompany receivables	(1,896.3)	(1,348.1)
Inventories	(1.6)	(2.2)
Prepaid, income taxes and other current assets	(12.2)	(25.8)
Total current assets	(1,910.1)	(1,376.1)
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	(2,866.3)	(3,830.5)
Long-term intercompany receivables	(625.9)
Other assets		(13.5)
Other Long-Term Assets	0.0
Assets	(5,402.3)	(5,220.1)
Liabilities, Current [Abstract]
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	(1,896.3)	(1,348.1)
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	0.0
Other current liabilities	(12.2)	(21.2)
Total current liabilities	(1,908.5)	(1,369.3)
Long-term debt	0.0	0.0
Long-term intercompany payable	(625.9)
Other long-term liabilities	0.0	(18.0)
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(2,867.9)	(3,832.8)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	$ (5,402.3)	$ (5,220.1)