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COMMITMENTS AND CONTINGENCIES - Legal Proceedings (Narrative) (Details) $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Mar. 12, 2024 USD ($) | Dec. 19, 2016 USD ($) | Sep. 30, 2024 defendant claim
CBIZ Operations and a former employee of CBIZ MMP |  |  |
Commitments And Contingencies [Line Items] |  |  |
Total transaction price |  | $ 200.0 |
Litigation settlement, amount awarded | $ 3.1 |  |
CBIZ Operations and a former employee of CBIZ MMP | Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Amount of damages sought (up to) |  | $ 177.0 |
MOVEit Customer Data Security Breach Litigation |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of claims filed | claim |  |  | 180
Number of defendants | defendant |  |  | 100

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