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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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Amount of gain (loss) on sale of accounts receivable.

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-Publisher FASB
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-SubTopic 20
-Section 50
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The cash inflow associated with the proceeds from sale and collection of receivables during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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