Document and Entity Information - USD ($) $ in Billions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Feb. 12, 2026 |
Jun. 30, 2025 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | Dec. 31, 2025 | ||
| Document Fiscal Year Focus | 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Trading Symbol | DFIN | ||
| Entity Registrant Name | Donnelley Financial Solutions, Inc. | ||
| Entity Central Index Key | 0001669811 | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Shell Company | false | ||
| Entity Common Stock, Shares Outstanding | 25,619,983 | ||
| Entity Public Float | $ 1.6 | ||
| Title of 12(b) Security | Common Stock (Par Value $0.01) | ||
| Security Exchange Name | NYSE | ||
| Entity File Number | 1-37728 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 36-4829638 | ||
| Entity Address, Address Line One | 391 Steel Way | ||
| Entity Address, City or Town | Lancaster | ||
| Entity Address, State or Province | PA | ||
| Entity Address, Postal Zip Code | 17601 | ||
| City Area Code | 800 | ||
| Local Phone Number | 823-5304 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Documents Incorporated by Reference | Portions of the registrant’s proxy statement related to its annual meeting of stockholders scheduled to be held on May 13, 2026 are incorporated by reference into Part III of this Form 10-K. |
||
| Auditor Name | Deloitte & Touche LLP | ||
| Auditor Location | Chicago, Illinois | ||
| Auditor Firm ID | 34 | ||
| Auditor Opinion [Text Block] | Opinion on Internal Control over Financial Reporting We have audited the internal control over financial reporting of Donnelley Financial Solutions, Inc. and subsidiaries (the “Company”) as of December 31, 2025, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control — Integrated Framework (2013) issued by COSO. We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2025, of the Company and our report dated February 17, 2026, expressed an unqualified opinion on those financial statements. |