Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 304.4		$ 535.2
Restricted cash	139.3		8.0
Short-term investments	5.0		81.4
Trade receivables, net	818.1		830.1
Intercompany receivables	0.0		0.0
Inventories	846.5		728.9
Prepaid expenses	60.4		65.7
Income taxes	66.5		73.4
Prepaid, income taxes and other current assets	328.3		316.7
Total current assets	2,441.6		2,500.3
Securities and other investments	24.1		96.8
Property, plant and equipment, net	320.8		364.5
Goodwill	883.3		1,117.1			$ 998.3
Deferred income taxes	256.2		293.8
Finance lease receivables	14.9		14.4
Intangible assets, net	671.6		773.8
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0.0		0.0
Other assets	100.2		95.8
Assets	4,697.8		5,242.1
Liabilities, Current [Abstract]
Notes payable	52.7		66.7
Accounts payable	554.7		562.2
Intercompany payable	0.0		0.0
Deferred revenue	365.3		437.5
Payroll and other benefits liabilities	173.8		198.9
Other current liabilities	433.1		531.4
Total current liabilities	1,579.6		1,796.7
Long-term debt	2,337.0		1,787.1
Pensions, post-retirement and other benefits	260.7		266.4
Deferred income taxes	240.7		287.1
Other long-term liabilities	604.3		664.8
Commitments and contingencies
Redeemable noncontrolling interests	154.2		492.1	$ 485.7		44.1
Total Diebold Nixdorf, Incorporated shareholders' equity	(7.4)	$ 220.4	464.6	567.6	$ 583.2	588.7
Noncontrolling interests	30.1	$ 34.1	36.8	$ 39.5	$ 37.5	$ 433.4
Total liabilities, redeemable noncontrolling interests and equity	4,697.8		5,242.1
Reportable Legal Entities [Member] | Parent Company [Member]
Cash and cash equivalents	10.3		58.5
Restricted cash	0.0		0.0
Short-term investments	0.0		0.0
Trade receivables, net	136.7		140.7
Intercompany receivables	204.1		735.7
Inventories	221.4		159.5
Prepaid, income taxes and other current assets	32.8		35.4
Total current assets	605.3		1,129.8
Securities and other investments	24.1		96.8
Property, plant and equipment, net	79.9		89.6
Goodwill	55.5		55.5
Deferred income taxes	125.0		150.8
Intangible assets, net	33.6		37.5
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	2,828.4		2,518.5
Other assets	34.1		47.2
Assets	3,785.9		4,125.7
Liabilities, Current [Abstract]
Notes payable	35.9		49.9
Accounts payable	117.2		88.1
Intercompany payable	1,004.0		1,337.1
Deferred revenue	87.1		115.8
Payroll and other benefits liabilities	24.6		26.1
Other current liabilities	142.1		112.5
Total current liabilities	1,410.9		1,729.5
Long-term debt	2,179.1		1,710.6
Other long-term liabilities	203.3		221.0
Redeemable noncontrolling interests	0.0		0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(7.4)		464.6
Noncontrolling interests	0.0		0.0
Total liabilities, redeemable noncontrolling interests and equity	3,785.9		4,125.7
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Cash and cash equivalents	3.9		2.3
Restricted cash	0.0		0.0
Short-term investments	0.0		0.0
Trade receivables, net	0.2		1.4
Intercompany receivables	605.0		907.8
Inventories	0.0		0.0
Prepaid, income taxes and other current assets	21.3		17.0
Total current assets	630.4		928.5
Securities and other investments	0.0		0.0
Property, plant and equipment, net	1.0		2.1
Goodwill	0.0		0.0
Deferred income taxes	2.4		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	0.4		1.1
Assets	634.2		939.7
Liabilities, Current [Abstract]
Notes payable	0.1		0.3
Accounts payable	0.0		0.1
Intercompany payable	23.9		192.2
Deferred revenue	0.1		0.6
Payroll and other benefits liabilities	1.1		2.2
Other current liabilities	1.0		2.8
Total current liabilities	26.2		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	608.0		741.4
Noncontrolling interests	0.0		0.0
Total liabilities, redeemable noncontrolling interests and equity	634.2		939.7
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	290.2		474.4
Restricted cash	139.3		8.0
Short-term investments	5.0		81.4
Trade receivables, net	681.2		688.0
Intercompany receivables	399.2		2,104.1
Inventories	625.1		569.4
Prepaid, income taxes and other current assets	299.6		286.1
Total current assets	2,439.6		4,211.4
Securities and other investments	0.0		0.0
Property, plant and equipment, net	239.9		272.8
Goodwill	827.8		1,061.6
Deferred income taxes	128.8		135.0
Intangible assets, net	638.0		736.3
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0.0		0.0
Other assets	82.5		74.0
Assets	4,356.6		6,491.1
Liabilities, Current [Abstract]
Notes payable	16.7		16.5
Accounts payable	437.5		474.0
Intercompany payable	180.4		2,218.3
Deferred revenue	278.1		321.1
Payroll and other benefits liabilities	148.1		170.6
Other current liabilities	314.2		437.9
Total current liabilities	1,375.0		3,638.4
Long-term debt	157.9		76.4
Other long-term liabilities	419.0		470.3
Redeemable noncontrolling interests	154.2		492.1
Total Diebold Nixdorf, Incorporated shareholders' equity	2,220.4		1,777.1
Noncontrolling interests	30.1		36.8
Total liabilities, redeemable noncontrolling interests and equity	4,356.6		6,491.1
Consolidation, Eliminations [Member]
Cash and cash equivalents	0.0		0.0
Restricted cash	0.0		0.0
Short-term investments	0.0		0.0
Trade receivables, net	0.0		0.0
Intercompany receivables	(1,208.3)		(3,747.6)
Inventories	0.0		0.0
Prepaid, income taxes and other current assets	(25.4)		(21.8)
Total current assets	(1,233.7)		(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	(2,828.4)		(2,518.5)
Other assets	(16.8)		(26.5)
Assets	(4,078.9)		(6,314.4)
Liabilities, Current [Abstract]
Notes payable	0.0		0.0
Accounts payable	0.0		0.0
Intercompany payable	(1,208.3)		(3,747.6)
Deferred revenue	0.0		0.0
Payroll and other benefits liabilities	0.0		0.0
Other current liabilities	(24.2)		(21.8)
Total current liabilities	(1,232.5)		(3,769.4)
Long-term debt	0.0		0.0
Other long-term liabilities	(18.0)		(26.5)
Redeemable noncontrolling interests	0.0		0.0
Total Diebold Nixdorf, Incorporated shareholders' equity	(2,828.4)		(2,518.5)
Noncontrolling interests	0.0		0.0
Total liabilities, redeemable noncontrolling interests and equity	$ (4,078.9)		$ (6,314.4)