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Net Income (Loss) Attributable to Shareholders of Crawford & Company per Common Share - Additional Information (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	May 09, 2019
Class A Non-Voting
Equity, Class of Treasury Stock
Shares repurchased (shares)	90,062	155,351
Average cost (USD per share)	$ 8.05	$ 8.42
Class B Voting
Equity, Class of Treasury Stock
Shares repurchased (shares)	58,837	161,459
Average cost (USD per share)	$ 7.90	$ 8.42
Repurchase Authorization 2019 | Common Stock
Equity, Class of Treasury Stock
Number of shares authorized to be repurchased (shares)			2,000,000
Number of shares remaining to be repurchased (shares)	493,198

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