Supplemental Guarantor Information (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents	$ 535.2	$ 652.7	$ 313.6	$ 326.1
Short-term investments	81.4	64.1
Trade receivables, net	830.1	835.9
Intercompany receivables	0.0	0.0
Inventories	737.0	737.7
Prepaid expenses	65.7	60.7
Income taxes	73.4	85.2
Other current assets	185.6	183.3
Total current assets	2,508.4	2,619.6
Securities and other investments	96.8	94.7
Property, plant and equipment, net	364.5	387.0
Goodwill	1,117.1	998.3	161.5
Deferred income taxes	293.8	309.5
Finance lease receivables	14.4	25.2
Intangible assets, net	773.8	772.9
Investment in subsidiary	0.0	0.0
Other assets	81.4	63.1
Assets	5,250.2	5,270.3
Notes payable	66.7	106.9
Accounts payable	562.2	560.5
Intercompany payable	0.0	0.0
Deferred revenue	437.5	404.2
Payroll and other benefits liabilities	198.9	172.5
Other current liabilities	534.1	580.4
Total current liabilities	1,799.4	1,824.5
Long-term debt	1,787.1	1,691.4
Pensions, post-retirement and other benefits	266.4	297.2
Deferred income taxes	287.1	300.6
Other liabilities	111.3	87.7
Commitments and contingencies
Redeemable noncontrolling interests	492.1	44.1	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	470.0	591.4
Noncontrolling interests	36.8	433.4
Total liabilities and equity	5,250.2	5,270.3
Parent Company [Member]
Cash and cash equivalents	58.5	138.9	20.3	14.7
Short-term investments	0.0	0.0
Trade receivables, net	140.7	140.1
Intercompany receivables	735.7	883.0
Inventories	167.6	147.9
Prepaid expenses	15.7	15.0
Income taxes	4.5	0.3
Other current assets	15.2	5.1
Total current assets	1,137.9	1,330.3
Securities and other investments	96.8	94.7
Property, plant and equipment, net	89.6	102.9
Goodwill	55.5	55.5
Deferred income taxes	150.8	173.7
Finance lease receivables	3.3	4.8
Intangible assets, net	37.5	1.8
Investment in subsidiary	2,518.5	2,609.5
Other assets	43.9	7.8
Assets	4,133.8	4,381.0
Notes payable	49.9	30.9
Accounts payable	88.1	109.1
Intercompany payable	1,337.1	1,421.2
Deferred revenue	115.8	122.3
Payroll and other benefits liabilities	26.1	22.9
Other current liabilities	115.2	156.1
Total current liabilities	1,732.2	1,862.5
Long-term debt	1,710.6	1,690.5
Pensions, post-retirement and other benefits	199.8	212.6
Deferred income taxes	10.0	13.4
Other liabilities	11.2	10.6
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	470.0	591.4
Noncontrolling interests	0.0	0.0
Total liabilities and equity	4,133.8	4,381.0
Guarantor Subsidiaries [Member]
Cash and cash equivalents	2.3	2.3	7.9	2.5
Short-term investments	0.0	0.0
Trade receivables, net	1.4	0.0
Intercompany receivables	907.8	783.7
Inventories	0.0	16.2
Prepaid expenses	1.0	1.1
Income taxes	15.2	25.4
Other current assets	0.8	1.6
Total current assets	928.5	830.3
Securities and other investments	0.0	0.0
Property, plant and equipment, net	2.1	9.0
Goodwill	0.0	0.0
Deferred income taxes	8.0	7.8
Finance lease receivables	1.1	4.8
Intangible assets, net	0.0	13.6
Investment in subsidiary	0.0	0.0
Other assets	0.0	0.1
Assets	939.7	865.6
Notes payable	0.3	1.3
Accounts payable	0.1	1.1
Intercompany payable	192.2	175.9
Deferred revenue	0.6	0.7
Payroll and other benefits liabilities	2.2	1.4
Other current liabilities	2.8	3.9
Total current liabilities	198.2	184.3
Long-term debt	0.1	0.4
Pensions, post-retirement and other benefits	0.0	0.0
Deferred income taxes	0.0	0.0
Other liabilities	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	741.4	680.9
Noncontrolling interests	0.0	0.0
Total liabilities and equity	939.7	865.6
Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	474.4	511.5	285.4	308.9
Short-term investments	81.4	64.1
Trade receivables, net	688.0	696.4
Intercompany receivables	2,104.1	497.0
Inventories	569.4	573.6
Prepaid expenses	49.0	44.6
Income taxes	68.8	84.9
Other current assets	176.3	176.6
Total current assets	4,211.4	2,648.7
Securities and other investments	0.0	0.0
Property, plant and equipment, net	272.8	275.1
Goodwill	1,061.6	942.8
Deferred income taxes	135.0	128.0
Finance lease receivables	10.0	15.6
Intangible assets, net	736.3	757.5
Investment in subsidiary	0.0	9.9
Other assets	64.0	55.2
Assets	6,491.1	4,832.8
Notes payable	16.5	74.7
Accounts payable	474.0	450.9
Intercompany payable	2,218.3	566.6
Deferred revenue	321.1	281.2
Payroll and other benefits liabilities	170.6	148.2
Other current liabilities	437.9	445.8
Total current liabilities	3,638.4	1,967.4
Long-term debt	76.4	0.5
Pensions, post-retirement and other benefits	66.6	84.6
Deferred income taxes	277.1	287.2
Other liabilities	126.6	77.1
Redeemable noncontrolling interests	492.1	44.1
Total Diebold Nixdorf, Incorporated shareholders' equity	1,777.1	1,938.5
Noncontrolling interests	36.8	433.4
Total liabilities and equity	6,491.1	4,832.8
Reclassifications And Eliminations [Member]
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
Short-term investments	0.0	0.0
Trade receivables, net	0.0	(0.6)
Intercompany receivables	(3,747.6)	(2,163.7)
Inventories	0.0	0.0
Prepaid expenses	0.0	0.0
Income taxes	(15.1)	(25.4)
Other current assets	(6.7)	0.0
Total current assets	(3,769.4)	(2,189.7)
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
Finance lease receivables	0.0	0.0
Intangible assets, net	0.0	0.0
Investment in subsidiary	(2,518.5)	(2,619.4)
Other assets	(26.5)	0.0
Assets	(6,314.4)	(4,809.1)
Notes payable	0.0	0.0
Accounts payable	0.0	(0.6)
Intercompany payable	(3,747.6)	(2,163.7)
Deferred revenue	0.0	0.0
Payroll and other benefits liabilities	0.0	0.0
Other current liabilities	(21.8)	(25.4)
Total current liabilities	(3,769.4)	(2,189.7)
Long-term debt	0.0	0.0
Pensions, post-retirement and other benefits	0.0	0.0
Deferred income taxes	0.0	0.0
Other liabilities	(26.5)	0.0
Redeemable noncontrolling interests	0.0	0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(2,518.5)	(2,619.4)
Noncontrolling interests	0.0	0.0
Total liabilities and equity	$ (6,314.4)	$ (4,809.1)