Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Due to Affiliate, Noncurrent		$ 0.0
Cash, cash equivalents and restricted cash	$ 512.1	280.9
Short-term investments	13.5	10.0
Trade receivables, net	594.5	619.3
Intercompany receivables	0.0	0.0
Inventories	475.5	466.5
Prepaid, income taxes and other current assets	449.8	515.3
Total current assets	2,045.4	1,892.0
Securities and other investments	18.1	21.4
Property, plant and equipment, net	216.1	231.5
Goodwill	736.2	764.0		$ 798.2
Deferred income taxes	118.9	120.8
Customer relationships, net	467.5	502.3
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	285.6	313.2
Assets	3,838.8	3,790.6
Current liabilities
Notes payable	103.4	32.5
Accounts payable	499.2	471.5
Intercompany payable	0.0	0.0
Deferred revenue	371.4	320.5
Payroll and other benefits liabilities	170.3	224.7
Other current liabilities	501.4	550.4
Total current liabilities	1,645.7	1,599.6
Long-term debt	2,353.4	2,108.7
Pensions, post-retirement and other benefits	221.4	237.7
Long-term intercompany payable	0.0	0.0
Other long-term liabilities	529.7	330.0
Redeemable noncontrolling interests	20.6	20.9	$ 99.8	$ 130.4
Total Diebold Nixdorf, Incorporated shareholders' equity	(727.9)	(530.3)
Noncontrolling interests	17.3	24.0
Total liabilities, redeemable noncontrolling interests and equity	3,838.8	3,790.6
Reportable Legal Entities [Member] | Parent Company [Member]
Due to Affiliate, Noncurrent		0.0
Cash, cash equivalents and restricted cash	312.4	3.6
Short-term investments	0.0	0.0
Trade receivables, net	123.1	109.0
Intercompany receivables	587.1	632.6
Inventories	117.6	122.4
Prepaid, income taxes and other current assets	31.1	42.1
Total current assets	1,171.3	909.7
Securities and other investments	18.1	21.4
Property, plant and equipment, net	56.7	61.9
Goodwill	55.5	55.5
Deferred income taxes	53.5	51.1
Investment in subsidiary	1,580.5	1,676.8
Long-term intercompany receivables	602.6
Other assets	57.0	64.3
Assets	3,595.2	3,458.6
Current liabilities
Notes payable	93.3	26.6
Accounts payable	106.0	55.3
Intercompany payable	1,269.5	1,302.3
Deferred revenue	128.0	133.7
Payroll and other benefits liabilities	34.9	49.4
Other current liabilities	141.9	109.5
Total current liabilities	1,773.6	1,676.8
Long-term debt	2,342.9	2,107.4
Pensions, post-retirement and other benefits		160.3
Long-term intercompany payable	0.0	617.9
Other long-term liabilities	206.6	42.7
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(727.9)	(528.6)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	3,595.2	3,458.6
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Due to Affiliate, Noncurrent		0.0
Cash, cash equivalents and restricted cash	2.7	1.8
Short-term investments	0.0	0.0
Trade receivables, net	0.0	0.0
Intercompany receivables	554.1	559.3
Inventories	0.0	0.0
Prepaid, income taxes and other current assets	8.0	7.8
Total current assets	564.8	568.9
Securities and other investments	0.0	0.0
Property, plant and equipment, net	0.1	0.5
Goodwill	0.0	0.0
Deferred income taxes	6.4	6.4
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	1.6	0.1
Assets	572.9	575.9
Current liabilities
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	48.8	46.7
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	2.1
Other current liabilities	0.8	1.0
Total current liabilities	49.6	49.8
Long-term debt	0.0	0.0
Pensions, post-retirement and other benefits		0.0
Long-term intercompany payable	0.0	0.0
Other long-term liabilities	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	523.3	526.1
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	572.9	575.9
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Due to Affiliate, Noncurrent		617.9
Cash, cash equivalents and restricted cash	197.0	275.5
Short-term investments	13.5	10.0
Trade receivables, net	471.4	510.3
Intercompany receivables	715.4	747.6
Inventories	359.4	346.4
Prepaid, income taxes and other current assets	418.5	473.2
Total current assets	2,175.2	2,363.0
Securities and other investments	0.0	0.0
Property, plant and equipment, net	159.3	169.1
Goodwill	680.7	708.5
Deferred income taxes	59.0	63.3
Investment in subsidiary	0.0	0.0
Long-term intercompany receivables	0.0
Other assets	227.0	248.8
Assets	3,719.7	4,000.4
Current liabilities
Notes payable	10.1	5.9
Accounts payable	393.2	416.2
Intercompany payable	538.3	590.5
Deferred revenue	243.4	186.8
Payroll and other benefits liabilities	135.4	173.2
Other current liabilities	366.5	447.7
Total current liabilities	1,686.9	1,820.3
Long-term debt	10.5	1.3
Pensions, post-retirement and other benefits		77.4
Long-term intercompany payable	602.6	0.0
Other long-term liabilities	323.1	287.3
Redeemable noncontrolling interests	20.6	20.9
Total Diebold Nixdorf, Incorporated shareholders' equity	1,058.7	1,151.3
Noncontrolling interests	17.3	24.0
Total liabilities, redeemable noncontrolling interests and equity	3,719.7	4,000.4
Consolidation, Eliminations [Member]
Due to Affiliate, Noncurrent		(617.9)
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	(1,856.6)	(1,939.5)
Inventories	(1.5)	(2.3)
Prepaid, income taxes and other current assets	(7.8)	(7.8)
Total current assets	(1,865.9)	(1,949.6)
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
Investment in subsidiary	(1,580.5)	(1,676.8)
Long-term intercompany receivables	(602.6)
Other assets	0.0	0.0
Assets	(4,049.0)	(4,244.3)
Current liabilities
Notes payable	0.0	0.0
Accounts payable	0.0	0.0
Intercompany payable	(1,856.6)	(1,939.5)
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	0.0
Other current liabilities	(7.8)	(7.8)
Total current liabilities	(1,864.4)	(1,947.3)
Long-term debt	0.0	0.0
Pensions, post-retirement and other benefits		0.0
Long-term intercompany payable	(602.6)	(617.9)
Other long-term liabilities	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(1,582.0)	(1,679.1)
Noncontrolling interests	0.0	0.0
Total liabilities, redeemable noncontrolling interests and equity	(4,049.0)	(4,244.3)
Customer Relationships [Member]
Customer relationships, net	418.5	447.7
Customer Relationships [Member] | Reportable Legal Entities [Member] | Parent Company [Member]
Customer relationships, net	0.0	0.0
Customer Relationships [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Customer relationships, net	0.0	0.0
Customer Relationships [Member] | Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Customer relationships, net	418.5	447.7
Customer Relationships [Member] | Consolidation, Eliminations [Member]
Customer relationships, net	$ 0.0	$ 0.0