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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CRD-A Issued under the Non-Employee Director Stock Plan
Share-based Compensation Arrangement
Stock issued during period	3	2	70	87
CRD-A Issued under the U.K. ShareSave Scheme
Share-based Compensation Arrangement
Stock issued during period	1	14	2	280
CRD-A Issued under the Executive Stock Bonus Plan
Share-based Compensation Arrangement
Stock issued during period				30
2016 Omnibus Stock and Incentive Plan
Share-based Compensation Arrangement
Stock issued during period		3		62
CRD-A Issued under the Employee Stock Purchase Plan
Share-based Compensation Arrangement
Stock issued during period	114	131	114	131
CRD-A Issued under the International Plan
Share-based Compensation Arrangement
Stock issued during period	4	4	4	4

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