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Off-Balance Sheet Arrangements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of factoring receivables | $ 566.4 | $ 452.2 | $ 630.3
WEX Europe Services |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gain (loss) on sale of factoring receivables | 2.8 | 2.4 | 3.5
Wex Bank |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of factoring receivables | 2,900.0 | 4,100.0 | 14,800.0
Gain (loss) on sale of factoring receivables | $ 0.0 | 0.0 | 3.7
WEX Latin America debt |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gain (loss) on sale of factoring receivables |  | $ 6.5 | $ 16.1

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