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Net Income Attributable to Shareholders of Crawford & Company per Common Share - Schedule of Shares Issued and Included in Weighted-average Common Shares used to Compute Basic and Diluted Earnings per Share (Details) - Class A Non-Voting - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CRD-A Issued under the Non-Employee Director Stock Plan
Share-based Compensation Arrangement
Shares issued repurchased activity	(0)	3	67	70
CRD-A Issued under the U.K. ShareSave Scheme
Share-based Compensation Arrangement
Shares issued repurchased activity	5	1	70	2
Employee Stock Purchase Plan
Share-based Compensation Arrangement
Shares issued repurchased activity	159	114	159	114
International Plan
Share-based Compensation Arrangement
Shares issued repurchased activity		4		4

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