SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]
Description of Business	Description of Business: CBIZ, Inc., together with all of its wholly-owned subsidiaries ("CBIZ", the "Company", "we", "us", or "our"), 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. In December of 2024, the Company formed CBIZ CC, LLC and CBIZ Campus One Cell, LLC (collectively “Captive Insurance Company”). CBIZ CC, LLC, a sponsored captive core, is not expected to have any underwriting activities. CBIZ Campus One Cell, LLC, a sponsored captive cell, provides stop-loss coverages to a group of higher education institutions who self-insure their medical and prescription drug benefits. The term of the insurance policy is one year, and the insured is billed at the beginning of each month for that month’s coverage. Registered in the State of Vermont, the Captive Insurance Company commenced operation on January 1, 2025. The Captive Insurance Company recognizes premium as revenue monthly as monthly coverage expires. For the three months ended March 31, 2025, revenue from the Captive Insurance Company was not material.
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 after elimination of all intercompany balances and transactions. We have determined that our relationship with certain CPA firms with which we maintain ASAs qualify as variable interest entities ("VIEs"), and we are the primary beneficiary of such VIE. The accompanying unaudited condensed consolidated financial statements do not reflect the operations or accounts of the VIEs 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 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 year ended December 31, 2024. 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, 2025.
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 year ended December 31, 2024. Certain prior period amounts have been reclassified to conform to current year presentation.
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTSThe 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 three months ended March 31, 2025, we have implemented all new ASUs that are in effect and that may impact our consolidated financial statements.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2025

Description of Business: CBIZ, Inc., together with all of its wholly-owned subsidiaries ("CBIZ", the "Company", "we", "us", or "our"), 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.

In December of 2024, the Company formed CBIZ CC, LLC and CBIZ Campus One Cell, LLC (collectively “Captive Insurance Company”). CBIZ CC, LLC, a sponsored captive core, is not expected to have any underwriting activities. CBIZ Campus One Cell, LLC, a sponsored captive cell, provides stop-loss coverages to a group of higher education institutions who self-insure their medical and prescription drug benefits. The term of the insurance policy is one year, and the insured is billed at the beginning of each month for that month’s coverage. Registered in the State of Vermont, the Captive Insurance Company commenced operation on January 1, 2025.

The Captive Insurance Company recognizes premium as revenue monthly as monthly coverage expires. For the three months ended March 31, 2025, revenue from the Captive Insurance Company was not material.

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 after elimination of all intercompany balances and transactions. We have determined that our relationship with certain CPA firms with which we maintain ASAs qualify as variable interest entities ("VIEs"), and we are the primary beneficiary of such VIE. The accompanying unaudited condensed consolidated financial statements do not reflect the operations or accounts of the VIEs 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 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 year ended December 31, 2024.

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, 2025.

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 year ended December 31, 2024.

Certain prior period amounts have been reclassified to conform to current year presentation.

New Accounting Pronouncements

NEW ACCOUNTING PRONOUNCEMENTSThe 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 three months ended March 31, 2025, we have implemented all new ASUs that are in effect and that may impact our consolidated financial statements.