Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2023
Accounting Policies [Abstract]
Description of Business	Description of Business: CBIZ, Inc. is a diversified services company which, acting through its subsidiaries, has been providing professional business services since 1996, primarily to small and medium-sized businesses, as well as individuals, governmental entities, and not-for-profit enterprises throughout the United States and parts of Canada. CBIZ, Inc. manages and reports its operations along three practice groups: Financial Services, Benefits and Insurance Services and National Practices. A further description of products and services offered by each of the practice groups is provided in Note 12, Segment Disclosures, to the accompanying unaudited condensed consolidated financial statements.Effective April 1, 2023, CBIZ formed Rockside Insurance Company, Inc. ("Rockside"), a captive insurance company licensed in Vermont. Rockside, wholly owned by CBIZ, provides insurance coverages for a portion of the retention deductibles from CBIZ's certain insurance programs with third party insurers.
Basis of Consolidation	Basis of Consolidation: The accompanying unaudited condensed consolidated financial statements include the operations of CBIZ, Inc. and all of its wholly-owned subsidiaries (“CBIZ”, the “Company”, “we”, “us”, or “our”), after elimination of all intercompany balances and transactions. These unaudited condensed consolidated financial statements do not reflect the operations or accounts of variable interest entities as the impact is not material to the financial condition, results of operations or cash flows of CBIZ.
Unaudited Interim Financial Statements	Unaudited Interim Financial Statements: The unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and applicable rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022. In the opinion of CBIZ management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial condition, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2023.
Use of Estimates	Use of Estimates: The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Changes in circumstances could cause actual results to differ materially from these estimates.
Changes in Accounting Policies	Changes in Accounting Policies: We have consistently applied the accounting policies for the periods presented as described in Note 1, Basis of Presentation and Significant Accounting Policies, to the consolidated financial statements contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022.
Reclassifications	Reclassifications: Certain prior period amounts have been reclassified to conform to current year's presentation.
New Accounting Pronouncements and Accounting Standards Adopted in 2023	NEW ACCOUNTING PRONOUNCEMENTS The FASB ASC is the sole source of authoritative GAAP other than the SEC issued rules and regulations that apply only to SEC registrants. The FASB issues an ASU to communicate changes to the FASB ASC. We assess and review the impact of all issued ASUs. During the nine months ended September 30, 2023, we have implemented all new ASUs that are in effect and that may impact our consolidated financial statements. Accounting Standards Adopted in 2023 In August 2023, the FASB issued ASU No. 2023-04, Liabilities (Topic 405): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 121, which amended and added various SEC paragraphs in the ASC to reflect the issuance of SEC Staff Bulletin No. 121. We adopted ASU No. 2023-04 upon issuance and the adoption had no material impact on our condensed consolidated financial statements and related disclosures. In July 2023, the FASB issued ASU No. 2023-03, Presentation of Financial Statements (Topic 205), Income Statement - Reporting Comprehensive Income (Topic 220), Distinguishing Liabilities from Equity (Topic 480), Equity (Topic 505), and Compensation - Stock Compensation (Topic 718): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 120, SEC Staff Announcement at the March 24, 2022 EITF Meeting, and Staff Accounting Bulletin Topic 6.B, Accounting Series Release 280 - General Revision of Regulation S-X: Income or Loss Applicable to Common Stock, which amended and added various SEC paragraphs in the ASC to reflect the issuance of SEC Staff Bulletin No. 120. We adopted ASU No. 2023-04 upon issuance and the adoption had no material impact on our condensed consolidated financial statements and related disclosures.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2023

Description of Business: CBIZ, Inc. is a diversified services company which, acting through its subsidiaries, has been providing professional business services since 1996, primarily to small and medium-sized businesses, as well as individuals, governmental entities, and not-for-profit enterprises throughout the United States and parts of Canada. CBIZ, Inc. manages and reports its operations along three practice groups: Financial Services, Benefits and Insurance Services and National Practices. A further description of products and services offered by each of the practice groups is provided in Note 12, Segment Disclosures, to the accompanying unaudited condensed consolidated financial statements.Effective April 1, 2023, CBIZ formed Rockside Insurance Company, Inc. ("Rockside"), a captive insurance company licensed in Vermont. Rockside, wholly owned by CBIZ, provides insurance coverages for a portion of the retention deductibles from CBIZ's certain insurance programs with third party insurers.

Basis of Consolidation

Basis of Consolidation: The accompanying unaudited condensed consolidated financial statements include the operations of CBIZ, Inc. and all of its wholly-owned subsidiaries (“CBIZ”, the “Company”, “we”, “us”, or “our”), after elimination of all intercompany balances and transactions. These unaudited condensed consolidated financial statements do not reflect the operations or accounts of variable interest entities as the impact is not material to the financial condition, results of operations or cash flows of CBIZ.

Unaudited Interim Financial Statements

Unaudited Interim Financial Statements: The unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and applicable rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022.

In the opinion of CBIZ management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial condition, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2023.

Use of Estimates

Use of Estimates: The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Changes in circumstances could cause actual results to differ materially from these estimates.

Changes in Accounting Policies

Changes in Accounting Policies: We have consistently applied the accounting policies for the periods presented as described in Note 1, Basis of Presentation and Significant Accounting Policies, to the consolidated financial statements contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022.

Reclassifications

Reclassifications: Certain prior period amounts have been reclassified to conform to current year's presentation.

New Accounting Pronouncements and Accounting Standards Adopted in 2023

NEW ACCOUNTING PRONOUNCEMENTS

The FASB ASC is the sole source of authoritative GAAP other than the SEC issued rules and regulations that apply only to SEC registrants. The FASB issues an ASU to communicate changes to the FASB ASC. We assess and review the impact of all issued ASUs. During the nine months ended September 30, 2023, we have implemented all new ASUs that are in effect and that may impact our consolidated financial statements.

Accounting Standards Adopted in 2023

In August 2023, the FASB issued ASU No. 2023-04, Liabilities (Topic 405): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 121, which amended and added various SEC paragraphs in the ASC to reflect the issuance of SEC Staff Bulletin No. 121. We adopted ASU No. 2023-04 upon issuance and the adoption had no material impact on our condensed consolidated financial statements and related disclosures.

In July 2023, the FASB issued ASU No. 2023-03, Presentation of Financial Statements (Topic 205), Income Statement - Reporting Comprehensive Income (Topic 220), Distinguishing Liabilities from Equity (Topic 480), Equity (Topic 505), and Compensation - Stock Compensation (Topic 718): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 120, SEC Staff Announcement at the March 24, 2022 EITF Meeting, and Staff Accounting Bulletin Topic 6.B, Accounting Series Release 280 - General Revision of Regulation S-X: Income or Loss Applicable to Common Stock, which amended and added various SEC paragraphs in the ASC to reflect the issuance of SEC Staff Bulletin No. 120. We adopted ASU No. 2023-04 upon issuance and the adoption had no material impact on our condensed consolidated financial statements and related disclosures.