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Net Income (Loss) 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
	Mar. 31, 2021	Mar. 31, 2020
CRD-A Issued under the Non-Employee Director Stock Plan
Share-based Compensation Arrangement
Stock issued during period	92	81
CRD-A Issued under the U.K. ShareSave Scheme
Share-based Compensation Arrangement
Stock issued during period	1	1

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Number of new stock issued during the period.

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