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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 09, 2019	Jul. 29, 2017
Class A Non-Voting
Equity, Class of Treasury Stock
Shares repurchased (shares)	0	401,892	155,351	1,103,398
Average cost (USD per share)		$ 9.72	$ 8.42	$ 9.33
Class B Voting
Equity, Class of Treasury Stock
Shares repurchased (shares)	0	231,137	161,459	1,680,377
Average cost (USD per share)		$ 9.43	$ 8.42	$ 9.16
Repurchase Authorization 2017 | Common Stock
Equity, Class of Treasury Stock
Number of shares authorized to be repurchased (shares)						2,000,000
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)	642,097		642,097
Stock Purchase Agreement | Class A Non-Voting
Equity, Class of Treasury Stock
Shares repurchased (shares)				421,427
Stock Purchase Agreement | Class B Voting
Equity, Class of Treasury Stock
Shares repurchased (shares)				1,376,889

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