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Commitments and Contingencies - Legal Proceedings (Details) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Dec. 19, 2016 USD ($) | Sep. 16, 2016 USD ($) | Mar. 31, 2021 USD ($) plaintiff
Baldino Group |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of plaintiffs | plaintiff |  |  | 2
Damages sought amount |  |  | $ 16.0
Altoona Regional Health System | Minimum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | $ 124.0 |
Altoona Regional Health System | Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount |  | $ 266.0 |
CBIZ Operations and a former employee of CBIZ MMP |  |  |
Commitments And Contingencies [Line Items] |  |  |
Total transaction price | $ 200.0 |  |
CBIZ Operations and a former employee of CBIZ MMP | Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Damages sought amount | $ 177.0 |  |

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