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Acquisitions - Schedule of Business Acquisitions (Details) - USD ($)
Apr. 13, 2021
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Non-controlling interest $ 0 $ 0 $ 13,022,000
WEX Europe Services      
Business Acquisition [Line Items]      
Purchase price 96,992,000    
Change in value of redeemable non-controlling interest (13,077,000)    
Accumulated other comprehensive income (2,284,000)    
Additional paid-in capital $ (81,631,000)