Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Prior Period Adjustment [Abstract]
Loss (gain) on sale of assets, net	$ 1.3	$ 7.5	$ 30.2
Net loss attributable to Diebold Nixdorf, Incorporated	$ 78.8	$ 269.1	$ 341.3
Basic and diluted loss per share	$ (1.01)	$ (3.47)	$ (4.45)
Other current assets	$ 203.1	$ 227.0
Goodwill	743.6	800.4	$ 764.0
Deferred income taxes	95.7	97.5
Current assets held for sale	73.4	64.7
Current liabilities held for sale	20.3	15.4
Trade receivables, net	595.2	646.9	619.3
Deferred revenue	322.4	346.8	320.5
Revenue, Remaining Performance Obligation, Amount	1,800.0
Advertising expense	7.1	7.2	7.5
Research, development and engineering expense	126.3	133.4	147.1
Restricted Cash and Cash Equivalents	$ 0.0
Expected rate of return period	20 years
Amortization of unrecognized net gain (loss)	5.00%
Cash equivalents, maturity period	3 months
Accounts Receivable, Related Parties	$ 3.9
Accounts Payable, Related Parties	34.9
Equity in earnings (loss) of unconsolidated subsidiaries, net	0.3	0.7	1.0
Proceeds from Noncontrolling Interests	12.7	0.0	0.0
CloudComputingArrangementsAdditions	50.7	27.1
Balance at January 1	37.5	42.2	58.2
Charged to costs and expenses	9.8	10.1	5.2
Charged to other accounts (1)	0.0	(1.2)	(0.9)
Deductions (2)	(12.0)	(13.6)	(20.3)
Balance at December 31	$ 35.3	37.5	42.2
Minimum
Prior Period Adjustment [Abstract]
Past Due Period Of Financing Receivable Accruing Interest	90 days
Kony, Inc. [Member]
Prior Period Adjustment [Abstract]
Proceeds from Noncontrolling Interests		21.3
Cost Method Investments			$ 14.0
Gain on Sale of Investments		$ 7.3
Inspur (Suzhou) Financial Technology Service Co Ltd [Member]
Prior Period Adjustment [Abstract]
Equity Method Investment, Ownership Percentage	48.10%	40.00%
Aisino-Wincor Retail And Banking Systems (Shanghai) Co.,Ltd [Member]
Prior Period Adjustment [Abstract]
Equity Method Investment, Ownership Percentage	49.00%