Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 299.0		$ 535.2	$ 451.3		$ 652.7
Short-term investments	14.5		81.4
Trade receivables, net	809.3		830.1
Intercompany receivables	0.0		0.0
Inventories	820.9		737.0
Prepaid expenses	62.0		65.7
Income taxes	66.5		73.4
Prepaid, income taxes and other current assets	348.5		324.7
Total current assets	2,292.2		2,508.4
Securities and other investments	96.9		96.8
Property, plant and equipment, net	338.3		364.5
Goodwill	998.6		1,117.1			998.3
Deferred income taxes	285.1		293.8
Finance lease receivables	12.8		14.4
Intangible assets, net	704.5		773.8
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0.0		0.0
Other assets	93.0		95.8
Assets	4,808.6		5,250.2
Liabilities, Current [Abstract]
Notes payable	68.5		66.7
Accounts payable	566.2		562.2
Intercompany payable	0.0		0.0
Deferred revenue	416.1		437.5
Payroll and other benefits liabilities	168.9		198.9
Other current liabilities	432.4		534.1
Total current liabilities	1,652.1		1,799.4
Long-term debt	1,816.6		1,787.1
Pensions, post-retirement and other benefits	255.8		266.4
Deferred income taxes	255.4		287.1
Other long-term liabilities	610.2		664.8
Commitments and contingencies
Redeemable noncontrolling interests	468.6		492.1	449.0		44.1
Total Diebold Nixdorf, Incorporated shareholders' equity	227.0	$ 426.9	470.0	587.2	$ 533.1	591.4
Noncontrolling interests	34.1	$ 36.2	36.8	37.5	$ 34.8	433.4
Total liabilities, redeemable noncontrolling interests and equity	4,808.6		5,250.2
Reportable Legal Entities [Member] | Parent Company [Member]
Cash and cash equivalents	9.0		58.5	6.5		138.4
Short-term investments	0.0		0.0
Trade receivables, net	158.6		140.7
Intercompany receivables	773.4		735.7
Inventories	202.2		167.6
Prepaid, income taxes and other current assets	76.1		35.4
Total current assets	1,219.3		1,137.9
Securities and other investments	96.9		96.8
Property, plant and equipment, net	83.8		89.6
Goodwill	55.5		55.5
Deferred income taxes	147.9		150.8
Intangible assets, net	35.4		37.5
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	2,063.5		2,518.5
Other assets	34.5		47.2
Assets	3,736.8		4,133.8
Liabilities, Current [Abstract]
Notes payable	54.2		49.9
Accounts payable	105.8		88.1
Intercompany payable	1,189.0		1,337.1
Deferred revenue	114.0		115.8
Payroll and other benefits liabilities	19.9		26.1
Other current liabilities	147.7		115.2
Total current liabilities	1,630.6		1,732.2
Long-term debt	1,674.8		1,710.6
Other long-term liabilities	204.4		221.0
Redeemable noncontrolling interests	0.0		0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	227.0		470.0
Noncontrolling interests	0.0		0.0
Total liabilities, redeemable noncontrolling interests and equity	3,736.8		4,133.8
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash and cash equivalents	3.3		2.3	2.2		2.3
Short-term investments	0.0		0.0
Trade receivables, net	0.5		1.4
Intercompany receivables	805.3		907.8
Inventories	0.0		0.0
Prepaid, income taxes and other current assets	15.9		17.0
Total current assets	825.0		928.5
Securities and other investments	0.0		0.0
Property, plant and equipment, net	1.1		2.1
Goodwill	0.0		0.0
Deferred income taxes	8.0		8.0
Intangible assets, net	0.0		0.0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0.0		0.0
Other assets	0.6		1.1
Assets	834.7		939.7
Liabilities, Current [Abstract]
Notes payable	0.2		0.3
Accounts payable	0.1		0.1
Intercompany payable	193.8		192.2
Deferred revenue	0.4		0.6
Payroll and other benefits liabilities	1.4		2.2
Other current liabilities	1.0		2.8
Total current liabilities	196.9		198.2
Long-term debt	0.0		0.1
Other long-term liabilities	0.0		0.0
Redeemable noncontrolling interests	0.0		0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	637.8		741.4
Noncontrolling interests	0.0		0.0
Total liabilities, redeemable noncontrolling interests and equity	834.7		939.7
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	286.7		474.4	442.6		512.0
Short-term investments	14.5		81.4
Trade receivables, net	650.2		688.0
Intercompany receivables	3,458.3		2,104.1
Inventories	618.7		569.4
Prepaid, income taxes and other current assets	294.1		294.1
Total current assets	5,322.5		4,211.4
Securities and other investments	0.0		0.0
Property, plant and equipment, net	253.4		272.8
Goodwill	943.1		1,061.6
Deferred income taxes	129.2		135.0
Intangible assets, net	669.1		736.3
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0.0		0.0
Other assets	76.3		74.0
Assets	7,393.6		6,491.1
Liabilities, Current [Abstract]
Notes payable	14.1		16.5
Accounts payable	460.3		474.0
Intercompany payable	3,654.2		2,218.3
Deferred revenue	301.7		321.1
Payroll and other benefits liabilities	147.6		170.6
Other current liabilities	321.3		437.9
Total current liabilities	4,899.2		3,638.4
Long-term debt	141.8		76.4
Other long-term liabilities	424.2		470.3
Redeemable noncontrolling interests	468.6		492.1
Total Diebold Nixdorf, Incorporated shareholders' equity	1,425.7		1,777.1
Noncontrolling interests	34.1		36.8
Total liabilities, redeemable noncontrolling interests and equity	7,393.6		6,491.1
Consolidation, 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		0.0
Intercompany receivables	(5,037.0)		(3,747.6)
Inventories	0.0		0.0
Prepaid, income taxes and other current assets	(37.6)		(21.8)
Total current assets	(5,074.6)		(3,769.4)
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
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(2,063.5)		(2,518.5)
Other assets	(18.4)		(26.5)
Assets	(7,156.5)		(6,314.4)
Liabilities, Current [Abstract]
Notes payable	0.0		0.0
Accounts payable	0.0		0.0
Intercompany payable	(5,037.0)		(3,747.6)
Deferred revenue	0.0		0.0
Payroll and other benefits liabilities	0.0		0.0
Other current liabilities	(37.6)		(21.8)
Total current liabilities	(5,074.6)		(3,769.4)
Long-term debt	0.0		0.0
Other long-term liabilities	(18.4)		(26.5)
Redeemable noncontrolling interests	0.0		0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(2,063.5)		(2,518.5)
Noncontrolling interests	0.0		0.0
Total liabilities, redeemable noncontrolling interests and equity	$ (7,156.5)		$ (6,314.4)