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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
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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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