Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Prior Period Adjustment [Abstract]
Impairment of assets									$ 30.2	$ 180.2	$ 3.1
Net loss attributable to Diebold Nixdorf, Incorporated	$ 122.6	$ 35.7	$ 50.3	$ 132.7	$ 123.6	$ 213.6	$ 121.0	$ 73.2	$ 341.3	$ 531.4	$ 241.5
Basic and diluted loss per share	$ (1.60)	$ (0.46)	$ (0.66)	$ (1.74)	$ (1.62)	$ (2.81)	$ (1.59)	$ (0.97)	$ (4.45)	$ (6.99)	$ (3.20)
Other current assets	$ 230.7				$ 225.3				$ 230.7	$ 225.3
Goodwill	764.0				798.2				764.0	798.2	$ 1,045.7
Deferred income taxes	120.8				243.9				120.8	243.9
Total equity	(506.3)				(122.9)				(506.3)	(122.9)	482.3	$ 1,008.7
Current assets held for sale	233.3				79.0				233.3	79.0
Current liabilities held for sale	113.4				33.2				113.4	33.2
Trade receivables, net	619.3				737.2				619.3	737.2	827.9
Deferred revenue	320.5				378.2				320.5	378.2	436.5
Contract with Customer, Asset, Credit Loss Expense										24.4	22.8
Deferred Revenue, Revenue Recognized									314.0
Revenue, Remaining Performance Obligation, Amount	1,700.0								1,700.0
Advertising expense									7.5	10.1	11.0
Research, development and engineering expense									$ 147.1	157.4	155.5
Cash equivalents, maturity period									3 months
Restricted Cash and Cash Equivalents	3.6				$ 105.3				$ 3.6	105.3
Expected rate of return period									20 years
Amortization of unrecognized net gain (loss)									5.00%
Accounts Receivable, Related Parties	10.3								$ 10.3
Accounts Payable, Related Parties	11.8								11.8
Equity in earnings (loss) of unconsolidated subsidiaries, net									1.0	(13.2)	6.3
Aisino JV [Domain]
Prior Period Adjustment [Abstract]
Equity in earnings (loss) of unconsolidated subsidiaries, net										19.2
Kony, Inc. [Member]
Prior Period Adjustment [Abstract]
Proceeds from Noncontrolling Interests									21.3
Cost Method Investments	$ 14.0	$ 14.0							14.0
Gain on Sale of Investments									7.3
Cash Flow Depreciation presentation reclassification [Member]
Prior Period Adjustment [Abstract]
Cash Flow Depreciation Reclassification									$ 10.9
Cost of sales - services
Prior Period Adjustment [Abstract]
Service Cost of Sales Error Correction										$ 7.9
Inspur (Suzhou) Financial Technology Service Co Ltd [Member]
Prior Period Adjustment [Abstract]
Equity Method Investment, Ownership Percentage	40.00%								40.00%
Aisino-Wincor Retail And Banking Systems (Shanghai) Co.,Ltd [Member]
Prior Period Adjustment [Abstract]
Equity Method Investment, Ownership Percentage	43.60%								43.60%
Restatement Adjustment [Member]
Prior Period Adjustment [Abstract]
Impairment of assets									$ (37.3)
Net loss attributable to Diebold Nixdorf, Incorporated									$ (37.3)
Basic and diluted loss per share									$ (0.49)
Other current assets	$ (2.5)								$ (2.5)
Goodwill	(28.9)								(28.9)
Deferred income taxes	(68.1)								(68.1)
Total equity	$ 36.7								$ 36.7
Accounting Standards Update 2017-09 [Member]
Prior Period Adjustment [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification											$ 4.6