Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 377.9	$ 458.4
Short-term investments	31.5	33.5
Trade receivables, net	697.7	737.2
Intercompany receivables	0.0	0.0
Inventories	663.0	610.1
Prepaid expenses	60.9	57.4
Prepaid, income taxes and other current assets	367.2	364.2
Total current assets	2,137.3	2,203.4
Securities and other investments	18.7	22.4
Property, plant and equipment, net	294.5	304.1
Goodwill	813.6	827.1		$ 1,117.1
Deferred income taxes	208.4	243.9
Intangible assets, net	588.8	624.6
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	92.7	86.4
Other Long-Term Assets	266.0
Assets	4,327.3	4,311.9
Liabilities, Current [Abstract]
Notes payable	47.2	49.5
Accounts payable	491.8	509.5
Intercompany payable	0.0	0.0
Deferred revenue	443.2	378.2
Payroll and other benefits liabilities	167.2	184.3
Other current liabilities	505.1	446.9
Total current liabilities	1,654.5	1,568.4
Long-term debt	2,191.2	2,190.0
Long-term intercompany payable	0.0
Other long-term liabilities	656.5	582.7
Commitments and contingencies
Redeemable noncontrolling interests	99.8	130.4	$ 509.6	$ 492.1
Total Diebold Nixdorf, Incorporated shareholders' equity	(301.4)	(186.4)
Noncontrolling interests	26.7	26.8
Total liabilities, redeemable noncontrolling interests and equity	4,327.3	4,311.9
Reportable Legal Entities [Member] | Parent Company [Member]
Cash and cash equivalents	14.1	17.3
Short-term investments	0.0	0.0
Trade receivables, net	117.2	105.7
Intercompany receivables	660.3	205.3
Inventories	161.7	164.8
Prepaid, income taxes and other current assets	32.8	36.8
Total current assets	986.1	529.9
Securities and other investments	18.7	22.4
Property, plant and equipment, net	75.5	76.9
Goodwill	55.5	58.1
Deferred income taxes	106.5	139.9
Intangible assets, net	28.9	30.8
Investment in subsidiary	1,738.7	2,702.1
Long-term intercompany receivables	617.9
Other assets		30.2
Other Long-Term Assets	53.5
Assets	3,681.3	3,590.3
Liabilities, Current [Abstract]
Notes payable	26.9	25.7
Accounts payable	79.6	88.1
Intercompany payable	1,192.2	1,030.8
Deferred revenue	124.6	116.6
Payroll and other benefits liabilities	25.0	26.7
Other current liabilities	151.6	114.2
Total current liabilities	1,599.9	1,402.1
Long-term debt	2,164.5	2,172.5
Long-term intercompany payable	0.0
Other long-term liabilities	218.3	202.1
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(301.4)	(186.4)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	3,681.3	3,590.3
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash and cash equivalents	3.0	2.7
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.1
Intercompany receivables	589.3	606.3
Inventories	0.0	0.0
Prepaid, income taxes and other current assets	12.6	12.7
Total current assets	604.9	621.8
Securities and other investments	0.0	0.0
Property, plant and equipment, net	0.7	0.8
Goodwill	0.0	0.0
Deferred income taxes	6.2	6.2
Intangible assets, net	0.0	0.0
Investment in subsidiary	(1.6)	(0.6)
Long-term intercompany receivables	0.0
Other assets		0.4
Other Long-Term Assets	0.3
Assets	610.5	628.6
Liabilities, Current [Abstract]
Notes payable	0.0	0.1
Accounts payable	0.1	0.0
Intercompany payable	59.8	60.8
Deferred revenue	0.0	0.1
Payroll and other benefits liabilities	0.5	1.3
Other current liabilities	0.1	1.5
Total current liabilities	60.5	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	550.0	564.8
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	610.5	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	419.7	1,129.0
Long-term intercompany receivables	0.0
Other assets		0.0
Other Long-Term Assets	0.0
Assets	419.7	1,129.0
Liabilities, Current [Abstract]
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	122.5	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	122.5	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	297.2	1,008.9
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	419.7	1,129.0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	360.8	438.4
Short-term investments	31.5	33.5
Trade receivables, net	580.5	631.4
Intercompany receivables	724.4	536.5
Inventories	505.4	447.5
Prepaid, income taxes and other current assets	334.0	340.5
Total current assets	2,536.6	2,427.8
Securities and other investments	0.0	0.0
Property, plant and equipment, net	218.3	226.4
Goodwill	758.1	769.0
Deferred income taxes	95.7	97.8
Intangible assets, net	559.9	593.8
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets		69.3
Other Long-Term Assets	212.2
Assets	4,380.8	4,184.1
Liabilities, Current [Abstract]
Notes payable	20.3	23.7
Accounts payable	412.1	421.4
Intercompany payable	599.5	136.4
Deferred revenue	318.6	261.5
Payroll and other benefits liabilities	141.7	156.3
Other current liabilities	365.6	352.4
Total current liabilities	1,857.8	1,351.7
Long-term debt	26.7	17.5
Long-term intercompany payable	617.9
Other long-term liabilities	438.2	398.6
Redeemable noncontrolling interests	99.8	130.4
Total Diebold Nixdorf, Incorporated shareholders' equity	1,313.7	2,259.1
Noncontrolling interests	26.7	26.8
Total liabilities, redeemable noncontrolling interests and equity	4,380.8	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	(1,974.0)	(1,348.1)
Inventories	(4.1)	(2.2)
Prepaid, income taxes and other current assets	(12.2)	(25.8)
Total current assets	(1,990.3)	(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	(2,156.8)	(3,830.5)
Long-term intercompany receivables	(617.9)
Other assets		(13.5)
Other Long-Term Assets	0.0
Assets	(4,765.0)	(5,220.1)
Liabilities, Current [Abstract]
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	(1,974.0)	(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	(1,986.2)	(1,369.3)
Long-term debt	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	(2,160.9)	(3,832.8)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	$ (4,765.0)	$ (5,220.1)