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Off-Balance Sheet Arrangements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of factoring receivables | $ 1,300.0 | $ 800.0 | $ 1,900.0 | $ 3,700.0 |
WEX Europe Services |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of factoring receivables | 148.0 | 122.6 | 411.6 | 327.2 |
Gain (loss) on sale of factoring receivables | 0.7 | $ 0.0 | 2.0 | $ 1.7 |
Outstanding receivables in excess of credit limit | $ 0.6 |  | $ 0.6 |  | $ 0.0

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