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Acquisitions - Schedule of Business Acquisitions (Details) - USD ($)		12 Months Ended
	Apr. 13, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Business Acquisition [Line Items]
Adjustments to additional paid in capital		$ 6,123,000
Non-controlling interest	$ 0	0	$ 13,022,000		$ 9,575,000
Expenses related to acquisitions		2,400,000	$ 97,900,000	$ 13,000,000
WEX Europe Services
Business Acquisition [Line Items]
Purchase price	96,992,000
Non-controlling interest	(13,077,000)
Accumulated other comprehensive income	(2,284,000)
Adjustments to additional paid in capital	$ (81,631,000)
Expenses related to acquisitions		$ 538,000

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