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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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