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Net Income Attributable to Shareholders of Crawford & Company per Common Share - Additional Information (Details) - $ / shares | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | May 09, 2019
Class A Non-Voting |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |
Shares repurchased (shares) | 274,385 | 0 | 530,598 | 155,351 |
Average cost (USD per share) | $ 10.13 |  | $ 9.63 | $ 8.42 |
Class B Voting |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |
Shares repurchased (shares) | 30,547 | 0 | 111,499 | 161,459 |
Average cost (USD per share) | $ 9.72 |  | $ 8.68 | $ 8.42 |
Repurchase Authorization 2019 | Common Stock |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |
Number of shares authorized to be repurchased (shares) |  |  |  |  | 2,000,000

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