Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Trade receivables, net	$ 737.2				$ 827.9				$ 737.2	$ 827.9
Tax Act Of 2017 Income Tax Expense Benefit										81.7
Restatement of Prior Year Income, Tax Effects		$ (0.5)	$ (0.2)	$ (0.2)	(0.5)	$ (0.4)	$ (0.2)	$ (0.4)
Restatement of Prior Year Income, Net of Tax		$ (25.9)	$ 5.1	$ (2.3)	$ (1.9)	$ (3.8)	$ (0.4)	$ (2.4)
Impact of Restatement on Earnings Per Share, Basic		$ (0.34)	$ 0.07	$ (0.03)	$ (0.03)	$ (0.05)	$ (0.01)	$ (0.03)
Impact of Restatement on Earnings Per Share, Diluted		$ (0.34)	$ 0.07	$ (0.03)	$ (0.03)	$ (0.05)	$ (0.01)	$ (0.03)
Net sales	1,289.8	$ 1,119.0	$ 1,105.6	$ 1,064.2	$ 1,249.9	$ 1,122.7	$ 1,133.9	$ 1,102.8	4,578.6	4,609.3	$ 3,316.3
Gross profit (loss)	207.8	227.0	217.7	238.4	286.1	236.8	237.1	239.8	890.9	999.8	711.7
Loss from continuing operations, net of tax									(566.0)	(213.9)	(179.3)
Income from discontinued operations, net of tax									0.0	0.0	143.7
Income (loss) from discontinued operations, net of tax											143.7
Net loss	(127.5)	(244.6)	(128.3)	(65.6)	(102.7)	(32.6)	(24.1)	(54.5)	(566.0)	(213.9)	(35.6)
Net (loss) income attributable to noncontrolling interests	(3.9)	(6.1)	5.1	7.6	7.4	6.6	7.0	6.6	2.7	27.6	6.0
Net income (loss) attributable to Diebold Nixdorf, Incorporated	$ (123.6)	$ (238.5)	$ (133.4)	$ (73.2)	$ (110.1)	$ (39.2)	$ (31.1)	$ (61.1)	$ (568.7)	$ (241.5)	$ (41.6)
Basic and diluted earnings (loss) per share
Income (loss) from continuing operations, net of tax									$ (7.48)	$ (3.20)	$ (2.68)
Income from discontinued operations, net of tax									0.00	0.00	2.08
Net (loss) income attributable to Diebold, Incorporated (USD per share)	$ (1.62)	$ (3.13)	$ (1.76)	$ (0.97)	$ (1.46)	$ (0.52)	$ (0.41)	$ (0.81)	(7.48)	(3.20)	(0.60)
Diluted earnings (loss) per share
Income (loss) before discontinued operations, net of tax									(7.48)	(3.20)	(2.68)
Income from discontinued operations, net of tax									0.00	0.00	2.08
Net (loss) income attributable to Diebold, Incorporated	$ (1.62)	$ (3.13)	$ (1.76)	$ (0.97)	$ (1.46)	$ (0.52)	$ (0.41)	$ (0.81)	$ (7.48)	$ (3.20)	$ (0.60)
Basic weighted-average shares outstanding	76.1	76.1	76.0	75.8	75.5	75.5	75.5	75.3	76.0	75.5	69.1
Diluted weighted-average shares outstanding	76.1	76.1	76.0	75.8	75.5	75.5	75.5	75.3	76.0	75.5	69.1
Undistributed earnings	$ 20.6				$ 16.0				$ 20.6	$ 16.0
Valuation allowance	175.4				105.6				175.4	105.6
Impairment loss	0.0	$ 0.0	$ 83.1						217.5
Inventories	610.1				714.5				610.1	714.5
Other current assets	306.8				247.5				306.8	247.5
Goodwill	827.1				1,117.1				827.1	1,117.1	$ 998.3
Deferred revenue	378.2				436.5				378.2	436.5
Other current liabilities	446.9				531.4				446.9	531.4
Redeemable noncontrolling interests	130.4				492.1				130.4	492.1	44.1	$ 0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (159.6)				482.3				(159.6)	482.3	1,008.7	$ 428.0
NA Electronic Security [Member]
Income (loss) from discontinued operations, net of tax											(1.3)
Diluted earnings (loss) per share
Gain (loss) on sale of discontinued operations before taxes									239.5		239.5
Inventory Error Correction [Member]
Trade receivables, net		(2.3)	(2.3)	$ (2.3)	(2.2)	$ (2.1)	$ (2.0)	$ (2.0)		(2.2)
Restatement of Prior Year Income, Tax Effects										(1.5)	(1.4)
Restatement of Prior Year Income, Net of Tax										$ (8.4)	$ (8.6)
Impact of Restatement on Earnings Per Share, Basic										$ (0.11)	$ (0.12)
Diluted earnings (loss) per share
Inventories		(18.5)	(26.6)	(24.9)	(22.5)	(20.5)	(16.7)	(16.3)		$ (22.5)
Other current assets		(3.9)	(3.8)	(3.5)	(3.5)	(3.4)	(3.1)	(2.7)		(3.5)
Goodwill		(18.2)	6.9	0.0	0.0	0.0	0.0	0.0		0.0
Deferred revenue		(1.0)	(1.0)	(1.0)	(1.0)	(1.0)	(1.0)	(1.0)		(1.0)
Other current liabilities		(3.0)	(2.9)	(2.8)	(2.7)	(2.5)	(2.1)	(1.8)		(2.7)
Redeemable noncontrolling interests		17.1	13.6	1.1	0.0	0.0	0.0	0.0		0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(56.0)	(35.5)	(28.0)	(24.5)	(22.5)	(18.7)	(18.2)		(24.5)
Service [Member]
Net sales									2,789.5	2,785.3	$ 1,908.0
Product [Member]
Net sales									$ 1,789.1	1,824.0	1,408.3
Cost of sales - services | Inventory Error Correction [Member]
Restatement of Prior Year Income, Gross		0.5	1.6	1.7	1.9	2.8	0.4	2.3		8.4	8.0
Cost of sales - product | Inventory Error Correction [Member]
Restatement of Prior Year Income, Gross		0.8	0.4	0.8	0.4	0.4	0.3	0.4		$ 1.5	$ 2.0
Asset Impairment Charges [Member] | Inventory Error Correction [Member]
Restatement of Prior Year Income, Gross		$ 25.1	$ (6.9)	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0