Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	CBIZ, INC. AND SUBSIDIARIES NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Unaudited) (Continued) Note 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Selected Terms Used in Notes to the Consolidated Financial Statements ASA – Administrative Service Agreement. ASC – Accounting Standards Codification. ASU – Accounting Standards Update CPA firm – Certified Public Accounting firm. FASB – The Financial Accounting Standards Board. GAAP – United States Generally Accepted Accounting Principles. LIBOR – London Interbank Offered Rate. Legacy ASC Topic 840 – ASC Topic 840, Leases. New Lease Standard – ASU No. 2016-12, Leases. ROU – Right-of-Use Asset. SEC – United States Securities and Exchange Commission. Tax Act – Tax Cuts and Jobs Act of 2017. Topic 220 – ASU No. 2018-02, Income Statement – Reporting Comprehensive Income. Topic 606 – ASU No. 2014-09, Revenue from Contracts with Customers. Topic 815 – ASU No. 2017-12, Derivatives and Hedging. 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 16, Segment Disclosures, to the accompanying consolidated financial statements. 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 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: The condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“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, 2018. In our opinion, the accompanying 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, 2018. Use of Estimates: The preparation of 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: 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, 2018. Effective January 1, 2019, we have changed our accounting policy for the New Lease Standard as described below in Note 2, New Accounting Pronouncements. Revision of Previously Reported Financial Information: The Company has corrected an immaterial error related to the presentation of cash equivalents on the condensed Consolidated Statement of Cash Flows related to amounts included within funds held for clients. The correction resulted in a decrease of $57.2 million of cash used in investing activities for the period ended March 31, 2018, an increase of $148.8 million of cash, cash equivalents and restricted cash at January 1, 2018 and an increase of $91.6 million of cash, cash equivalents and restricted cash as of March 31, 2018 as reflected on the Consolidated Statement of Cash Flows.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Summary of Significant Accounting Policies

CBIZ, INC. AND SUBSIDIARIES

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Unaudited) (Continued)

Note 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Selected Terms Used in Notes to the Consolidated Financial Statements

ASA – Administrative Service Agreement.

ASC – Accounting Standards Codification.

ASU – Accounting Standards Update

CPA firm – Certified Public Accounting firm.

FASB – The Financial Accounting Standards Board.

GAAP – United States Generally Accepted Accounting Principles.

LIBOR – London Interbank Offered Rate.

Legacy ASC Topic 840 – ASC Topic 840, Leases.

New Lease Standard – ASU No. 2016-12, Leases.

ROU – Right-of-Use Asset.

SEC – United States Securities and Exchange Commission.

Tax Act – Tax Cuts and Jobs Act of 2017.

Topic 220 – ASU No. 2018-02, Income Statement – Reporting Comprehensive Income.

Topic 606 – ASU No. 2014-09, Revenue from Contracts with Customers.

Topic 815 – ASU No. 2017-12, Derivatives and Hedging.

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 16, Segment Disclosures, to the accompanying consolidated financial statements.

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 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: The condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“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, 2018.

In our opinion, the accompanying 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, 2018.

Use of Estimates: The preparation of 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: 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, 2018. Effective January 1, 2019, we have changed our accounting policy for the New Lease Standard as described below in Note 2, New Accounting Pronouncements.

Revision of Previously Reported Financial Information: The Company has corrected an immaterial error related to the presentation of cash equivalents on the condensed Consolidated Statement of Cash Flows related to amounts included within funds held for clients. The correction resulted in a decrease of $57.2 million of cash used in investing activities for the period ended March 31, 2018, an increase of $148.8 million of cash, cash equivalents and restricted cash at January 1, 2018 and an increase of $91.6 million of cash, cash equivalents and restricted cash as of March 31, 2018 as reflected on the Consolidated Statement of Cash Flows.