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General | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
General | Basis of Presentation — The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and the rules of the Securities and Exchange Commission ("SEC"). The consolidated financial statements include the accounts of ASGN Incorporated and its wholly-owned subsidiaries ("ASGN" or the "Company"). The results of operations for acquired companies are included in the consolidated results of the Company from the date of acquisition (see Note 6. Acquisitions). All intercompany accounts and transactions have been eliminated. Use of Estimates — The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Those estimates determined to be most critical to the preparation of the financial statements are discussed below in Note 2. Summary of Significant Accounting Policies. Actual results could differ from those estimates.

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- Definition The entire disclosure for the basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 235 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//235/tableOfContent + Details
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