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Financing and Other Debt - Narrative (Details)		1 Months Ended	12 Months Ended
	Jul. 01, 2020 USD ($) trading_day $ / shares shares	Jun. 30, 2020	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Principal			$ 3,132,090,000	$ 2,972,674,000
Prepayment percentage			25.00%
Proceeds from issuance of convertible notes			$ 299,150,000	0	$ 0
Sale of stock, consideration received on transaction	$ 90,000,000
Consent fees amount			2,900,000
Loss on debt extinguishment				1,300,000	1,100,000
General and administrative expenses incurred				10,600,000	3,800,000
Debt issuance costs capitalized				3,400,000	$ 5,800,000
Debt discount				11,000,000.0
Borrowed federal funds			$ 50,000,000.0	$ 50,000,000.0
Average interest rate on borrowed federal funds			1.01%	2.36%
Pledged receivables held as collateral			$ 249,800,000
Common Stock Issued | Private Placement
Debt Instrument [Line Items]
Sale of stock, number of shares Issued in transaction (in shares) | shares	577,254
Sale of stock, consideration received on transaction	$ 90,000,000.0
Sale of stock, price per share (in dollars per share) | $ / shares	$ 155.91
Minimum
Debt Instrument [Line Items]
Prepayment percentage			0.00%
Maximum
Debt Instrument [Line Items]
Prepayment percentage			50.00%
Revolving line-of-credit facility under 2016 Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, Increase (decrease)			$ 50,000,000.0
Revolving line-of-credit facility under 2016 Credit Agreement | Federal Reserve Bank
Debt Instrument [Line Items]
Current borrowing capacity			188,400,000
Letters of credit			0	$ 0
Loan Participations and Assignments
Debt Instrument [Line Items]
Principal			0	$ 50,000,000
Initial carrying value			$ 60,000,000
Weighted average effective interest rate (as a percent)				4.17%
Tranche A term loan
Debt Instrument [Line Items]
Interest coverage ratio (no less than)			2.75
Tranche A term loan | March 31, 2021
Debt Instrument [Line Items]
Interest coverage ratio (no less than)			3.00
Consolidated leverage ratio			7.50
Tranche A term loan | June 30, 2021
Debt Instrument [Line Items]
Consolidated leverage ratio			7.00
Tranche A term loan | September 30, 2021
Debt Instrument [Line Items]
Consolidated leverage ratio			6.50
Tranche A term loan | December 31, 2021
Debt Instrument [Line Items]
Consolidated leverage ratio			6.00
Tranche A term loan | September 30, 2022 and thereafter
Debt Instrument [Line Items]
Consolidated leverage ratio			5.00
Tranche A term loan | Credit Facility and Term Loans
Debt Instrument [Line Items]
Mandatory quarterly payments			$ 12,500,000
Tranche B term loan | Credit Facility and Term Loans
Debt Instrument [Line Items]
Mandatory quarterly payments			$ 3,700,000
2016 Credit Agreement
Debt Instrument [Line Items]
Weighted average effective interest rate (as a percent)			2.30%	4.00%
Commitment fee percentage			0.40%
2016 Credit Agreement | Minimum
Debt Instrument [Line Items]
Commitment fee percentage			0.30%
2016 Credit Agreement | Maximum
Debt Instrument [Line Items]
Commitment fee percentage			0.50%
2016 Credit Agreement | Revolving line-of-credit facility under 2016 Credit Agreement
Debt Instrument [Line Items]
Remaining borrowing capacity on revolving credit facility				$ 870,000,000.0
Letters of credit outstanding, amount			$ 51,628,000
Capitalized debt issuance costs			$ 4,300,000
Securitization Facility
Debt Instrument [Line Items]
Securitization facility, percentage of receivables used as collateral			85.00%
Interest rate during period, percent			0.97%	1.80%
Securitization facility			$ 62,600,000	$ 78,600,000
European Securitization Facility
Debt Instrument [Line Items]
Debt instrument, term			5 years
Interest rate during period, percent			0.98%	0.63%
Securitized debt			$ 23,400,000	$ 25,700,000
WEX Latin America debt
Debt Instrument [Line Items]
Principal			$ 0	2,660,000
Interest rate during period, percent			35.04%
Letter of Credit | 2016 Credit Agreement | Revolving line-of-credit facility under 2016 Credit Agreement
Debt Instrument [Line Items]
Remaining borrowing capacity on revolving credit facility				250,000,000.0
Swingline Loans | 2016 Credit Agreement | Revolving line-of-credit facility under 2016 Credit Agreement
Debt Instrument [Line Items]
Remaining borrowing capacity on revolving credit facility				20,000,000.0
Senior Notes | 4.75 percent senior notes
Debt Instrument [Line Items]
Long-term deposits			$ 400,000,000.0
Interest rate, stated percentage			4.75%
Line of Credit
Debt Instrument [Line Items]
Remaining borrowing capacity on revolving credit facility			$ 376,000,000.0	355,000,000.0
Borrowed federal funds			20,000,000.0	35,000,000.0
Convertible Debt
Debt Instrument [Line Items]
Principal				0
Proceeds from issuance of convertible notes	$ 389,200,000
Convertible Debt | Convertible Senior Notes Due 2027
Debt Instrument [Line Items]
Aggregate amount	310,000,000.0
Principal			310,000,000
Initial carrying value	$ 237,500,000		$ 240,887,000
Interest rate, stated percentage	6.50%		0.065%
Proceeds from issuance of convertible notes	$ 299,200,000
Debt instrument, term	7 years
Conversion price (in dollars per share) | $ / shares	$ 200.00
Threshold percentage	200.00%
Number trading days | trading_day	20
Number of consecutive trading days | trading_day	30
Proceeds from private placement and issuance of convertible debt	$ 389,200,000
Convertible debt, fair value, equity component	94,000,000.0
Convertible debt, fair value, liability component	295,200,000
Capitalized debt issuance costs	4,000,000.0
Debt issuance costs gross liability component	2,500,000
Debt issuance costs gross equity component	$ 1,500,000
Effective percentage	11.20%
Equity component	$ 54,700,000		$ 54,689,000
If-converted value in excess of principal			5,500,000
Debt issuance costs capitalized			2,358,000
Redemption price as percentage of principal amount	105.00%
Convertible Debt | Convertible Senior Notes Due 2027 | Minimum
Debt Instrument [Line Items]
Number trading days | trading_day	5
Secured debt
Debt Instrument [Line Items]
Principal			85,945,000	104,261,000
Secured debt | Tranche A term loan | Line of Credit
Debt Instrument [Line Items]
Aggregate amount				1,030,000,000.0
Principal			873,777,000	923,707,000
Secured debt | Tranche B term loan | Line of Credit
Debt Instrument [Line Items]
Aggregate amount				1,485,000,000.0
Principal			1,442,368,000	1,457,048,000
Secured debt | 2016 Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Principal			$ 2,316,145,000	$ 2,380,755,000
Base Rate | Tranche B term loan | Credit Facility and Term Loans
Debt Instrument [Line Items]
Margin on variable rate, percent			1.25%
Eurocurrency Rate | Revolving line-of-credit facility under 2016 Credit Agreement
Debt Instrument [Line Items]
Margin on variable rate, percent			1.00%
Eurocurrency Rate | Tranche B term loan | Credit Facility and Term Loans
Debt Instrument [Line Items]
Margin on variable rate, percent			2.25%
London Interbank Offered Rate (LIBOR) | Revolving line-of-credit facility under 2016 Credit Agreement
Debt Instrument [Line Items]
Margin on variable rate, percent		0.75%
London Interbank Offered Rate (LIBOR) | Loan Participations and Assignments
Debt Instrument [Line Items]
Margin on variable rate, percent			2.25%
Fed Funds Effective Rate Overnight Index Swap Rate | Revolving line-of-credit facility under 2016 Credit Agreement
Debt Instrument [Line Items]
Margin on variable rate, percent			0.50%

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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