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Off-Balance Sheet Arrangements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of receivables sold | $ 452.2 | $ 630.3 |
Gain (loss) on factoring | (2.4) | (3.5) |
WEX Europe Services |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of receivables sold | 4,100.0 | 14,800.0 |
Gain (loss) on factoring | (3.7) | (3.7) |
WEX Latin America debt |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gain (loss) on factoring | $ 6.5 | $ 16.1 |
WEX Latin America Securitization Facility | WEX Latin America debt |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Contribution to investment fund |  |  | $ 2.8
Operating interest |  |  | $ 4.4

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