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Acquisitions - Narrative (Details) $ in Thousands, € in Millions									3 Months Ended			6 Months Ended	10 Months Ended	11 Months Ended	12 Months Ended
	Jun. 01, 2021 USD ($)	Apr. 13, 2021 USD ($)	Dec. 15, 2020 USD ($)	Jul. 01, 2019 USD ($)	Jul. 01, 2019 EUR (€)	Mar. 05, 2019 USD ($)	Feb. 14, 2019 USD ($)	Jan. 24, 2019 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Expenses related to acquisitions															$ 2,400	$ 97,900	$ 13,000
Expenses related to acquisitions in process															0	0	4,800
Purchase price of acquisition, net of cash acquired															558,784	220,704	882,417
Legal settlement costs											$ 162,500					162,500
Goodwill											2,688,138	$ 2,441,201	$ 2,441,201	$ 2,441,201	2,908,057	2,688,138	$ 2,441,201
WEX Europe Services
Business Acquisition [Line Items]
Ownership percentage		100.00%
Discovery Benefits, Inc.
Business Acquisition [Line Items]
Ownership percentage by noncontrolling interest						4.90%
WEX Europe Services
Business Acquisition [Line Items]
Expenses related to acquisitions															538
Percentage of voting interests acquired		25.00%
Purchase price		$ 96,992
Benefitexpress
Business Acquisition [Line Items]
Purchase price	$ 275,000
Purchase price of acquisition, net of cash acquired															259,061
Total revenues															24,200
Net income (loss) before taxes															(2,100)
Goodwill															168,424
PO Holding
Business Acquisition [Line Items]
Purchase price of acquisition, net of cash acquired	262,500
PO Holding | Affiliated Entity
Business Acquisition [Line Items]
Payments to acquire businesses and interest in affiliates	$ 12,500
Original Purchase Agreement
Business Acquisition [Line Items]
Purchase price			$ 577,500
Purchase price of acquisition, net of cash acquired															383,323	383,204
Cash to be paid			$ 615,500
Working Capital Adjustment Received									$ 2,000	$ 1,900
Additional borrowing capacity added											415,000					415,000
Legal settlement											162,500
Goodwill											$ 291,884				$ 370,310	$ 291,884
Discovery Benefits, Inc.
Business Acquisition [Line Items]
Purchase price						$ 526,100
Total revenues													94,700
Net income (loss) before taxes													$ 300
Fair value of equity interests acquired						$ 100,000
Noventis
Business Acquisition [Line Items]
Purchase price								$ 338,700
Total revenues														43,800
Net income (loss) before taxes														$ 8,200
Amount of accelerated vesting of options								$ 5,500
Pavestone Capital
Business Acquisition [Line Items]
Purchase price of acquisition, net of cash acquired							$ 28,000
Go Fuel Card
Business Acquisition [Line Items]
Purchase price				$ 266,000	€ 235.0
Total revenues												10,500
Net income (loss) before taxes												$ (9,100)

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