Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	Commitments and Contingencies Indirect Tax Contingencies The Company accrues for indirect tax matters when management believes that a loss is probable and the amounts can be reasonably estimated, while contingent gains are recognized only when realized. In the event any losses are sustained in excess of accruals, they are charged against income. In evaluating indirect tax matters, management takes into consideration factors such as historical experience with matters of similar nature, specific facts and circumstances and the likelihood of prevailing. Management evaluates and updates accruals as matters progress over time. It is reasonably possible that some of the matters for which accruals have not been established could be decided unfavorably to the Company and could require recognizing future expenditures. Also, statutes of limitations could expire without the Company paying the taxes for matters for which accruals have been established, which could result in the recognition of future gains upon reversal of accruals at that time. At September 30, 2021, the Company was a party to several routine indirect tax claims from various taxing authorities globally that were incurred in the normal course of business, which neither individually nor in the aggregate are considered material by management in relation to the Company’s financial position or results of operations. In management’s opinion, the condensed consolidated financial statements would not be materially affected by the outcome of these indirect tax claims and/or proceedings or asserted claims. A loss contingency is reasonably possible if it has a more than remote but less than probable chance of occurring. Although management believes the Company has valid defenses with respect to its indirect tax positions, it is reasonably possible that a loss could occur in excess of the estimated liabilities. The Company estimated the aggregate risk at September 30, 2021 to be up to $76.3 for its material indirect tax matters. The aggregate risk related to indirect taxes is adjusted as the applicable statutes of limitations expire. Legal Contingencies At September 30, 2021, the Company was a party to several lawsuits that were incurred in the normal course of business, which neither individually nor in the aggregate were considered material by management in relation to the Company’s financial position or results of operations. In management’s opinion, the Company's condensed consolidated financial statements would not be materially affected by the outcome of these legal proceedings or asserted claims. In addition to these normal course of business litigation matters, the Company is a party to the proceedings described below: In January 2020, the Company’s Board of Directors received a demand letter from alleged shareholders to investigate and pursue claims for breach of fiduciary duty against certain current and former directors and officers based on the Company’s statements regarding its business and operations. In July 2021, the alleged shareholders informed the Company that they withdrew the demand letter and the matter was completely resolved in favor of the Company and its current and former officers. Diebold Nixdorf Holding Germany GmbH, formerly Diebold Nixdorf Holding Germany Inc. & Co. KGaA (Diebold KGaA), is a party to two separate appraisal proceedings (Spruchverfahren) in connection with the purchase of all shares in its former listed subsidiary, Diebold Nixdorf AG. Both proceedings are pending at the same Chamber for Commercial Matters (Kammer für Handelssachen) at the District Court (Landgericht) of Dortmund (Germany). The first appraisal proceeding relates to the Domination and Profit Loss Transfer Agreement (DPLTA) entered into by Diebold KGaA and former Diebold Nixdorf AG, which became effective on February 17, 2017. The DPLTA appraisal proceeding was filed by minority shareholders of Diebold Nixdorf AG challenging the adequacy of both the cash exit compensation of €55.02 per Diebold Nixdorf AG share (of which 6.9 million shares were then outstanding) and the annual recurring compensation of €2.82 per Diebold Nixdorf AG share offered in connection with the DPLTA. The second appraisal proceeding relates to the cash merger squeeze-out of minority shareholders of Diebold Nixdorf AG in 2019. The squeeze-out appraisal proceeding was filed by minority shareholders of Diebold Nixdorf AG challenging the adequacy of the cash exit compensation of €54.80 per Diebold Nixdorf AG share (of which 1.4 million shares were then outstanding) in connection with the merger squeeze-out. In both appraisal proceedings, a court ruling would apply to all Diebold Nixdorf AG shares outstanding at the time when the DPLTA or the merger squeeze-out, respectively, became effective. Any cash compensation received by former Diebold Nixdorf AG shareholders in connection with the merger squeeze-out would be netted with any higher cash compensation such shareholder may still claim in connection with the DPLTA appraisal proceeding. While the Company believes that the compensation offered in connection with the DPLTA and the merger squeeze-out was in both cases fair, it notes that German courts often adjudicate increases of the cash compensation to plaintiffs in varying amounts in connection with German appraisal proceedings. Therefore, the Company cannot rule out that the first instance court or an appellate court may increase the cash compensation also in these appraisal proceedings. The Company, however, is convinced that its defense in both appraisal proceedings is supported by strong sets of facts and the Company will continue to vigorously defend itself in these matters. Bank Guarantees, Standby Letters of Credit, and Surety Bonds In the ordinary course of business, the Company may issue performance guarantees on behalf of its subsidiaries to certain customers and other parties. Some of those guarantees may be backed by standby letters of credit, surety bonds, or similar instruments. In general, under the guarantees, the Company would be obligated to perform, or cause performance, over the term of the underlying contract in the event of an unexcused, uncured breach by its subsidiary, or some other specified triggering event, in each case as defined by the applicable guarantee. At September 30, 2021, the maximum future contractual obligations relative to these various guarantees totaled $180.0, of which $25.8 represented standby letters of credit to insurance providers, and no associated liability was recorded. At December 31, 2020, the maximum future payment obligations relative to these various guarantees totaled $177.3, of which $25.8 represented standby letters of credit to insurance providers, and no associated liability was recorded.