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Off-Balance Sheet Arrangements (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Renewal term |  |  |  | 1 year |  |
HSA assets amount serving as custodian |  | $ 4,200.0 |  | $ 4,200.0 |  |
HSA assets deposited and managed by third party depository partners |  | 1,000.0 |  | 1,000.0 |  |
HSA deposits |  | 3,270.0 |  | 3,270.0 |  | $ 3,020.0
WEX Europe Services |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Losses on factoring |  | 3.3 | $ 2.6 | 6.5 | $ 4.5 |
Proceeds from sale of factoring receivables |  | 137.1 | 142.9 | 267.7 | 283.4 |
WEX Bank |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Proceeds from sale of factoring receivables |  | $ 5,300.0 | 3,300.0 | $ 9,800.0 | 5,200.0 |
WEX Health |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Proceeds from sale of factoring receivables |  |  | $ 82.2 |  | $ 82.2 |
WEX Health | Revolving Credit Facility | Securitized debt |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Borrowing capacity | $ 35.0 |  |  |  |  |
Additional extension period | 3 years |  |  |  |  |
Termination notice period | 30 days |  |  |  |  |

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