Line Of Credit Facility Additional Available Borrowing Capacity

No definition available.

Name:	flt_LineOfCreditFacilityAdditionalAvailableBorrowingCapacity
Namespace Prefix:	flt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt - Summary of Debt Instruments Narrative (Details) - USD ($)			3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Jan. 22, 2019
Debt Instrument [Line Items]
Unused facility fee, as percentage of unused portion			0.30%
Securitization Facility
Debt Instrument [Line Items]
Amended securitization facility	$ 1,200,000,000		$ 1,200,000,000
Unused facility fee, as percentage of unused portion			0.40%	0.40%
Program fee			one month LIBOR
Term Loan B
Debt Instrument [Line Items]
Effective interest rate			4.50%
Revolving C Credit Facility
Debt Instrument [Line Items]
Effective interest rate			4.00%
Revolving line of credit	35,000,000	$ 35,000,000	$ 35,000,000	$ 35,000,000
Revolving line of credit A Facility
Debt Instrument [Line Items]
Effective interest rate			4.00%
Revolving line of credit	490,000,000	655,000,000	$ 490,000,000	655,000,000
Revolving line of credit B Facility—foreign
Debt Instrument [Line Items]
Effective interest rate			2.23%
Revolving line of credit B Facility—foreign \| US Dollar Borrowings
Debt Instrument [Line Items]
Revolving line of credit	70,000,000		$ 70,000,000
Revolving line of credit B Facility—foreign \| GBP Borrowings
Debt Instrument [Line Items]
Effective interest rate			3.99%
Revolving line of credit	90,000,000		$ 90,000,000
Revolving line of credit B Facility—foreign swing line
Debt Instrument [Line Items]
Effective interest rate			2.17%
Revolving line of credit	$ 30,749,000	$ 0	$ 30,749,000	$ 0
Commercial Paper \| Securitization Facility
Debt Instrument [Line Items]
Basis spread on variable rate		0.89%	0.80%
Program fee rate	2.53%	2.52%
Secured Debt
Debt Instrument [Line Items]
Additional borrowing capacity	$ 750,000,000		$ 750,000,000
Secured Debt \| Term A Loan Facility
Debt Instrument [Line Items]
Amended securitization facility	1,285,000,000.000		1,285,000,000.000
Secured Debt \| Term Loan A
Debt Instrument [Line Items]
Amended securitization facility	2,525,000,000.000		2,525,000,000.000
Secured Debt \| Term Loan B
Debt Instrument [Line Items]
Amended securitization facility	350,000,000.0		350,000,000.0
Secured Debt \| Revolving A Facility
Debt Instrument [Line Items]
Amended securitization facility	800,000,000		800,000,000
Secured Debt \| Revolving B Facility
Debt Instrument [Line Items]
Amended securitization facility	450,000,000		450,000,000
Secured Debt \| Revolving C Facility
Debt Instrument [Line Items]
Amended securitization facility	35,000,000		35,000,000
Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt	$ 2,000,000,000		$ 2,000,000,000		$ 2,000,000,000
Eurodollar \| Secured Debt \| Term Loan B
Debt Instrument [Line Items]
Basis spread on variable rate			2.00%
Base Rate \| Secured Debt \| Term Loan B
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
London Interbank Offered Rate (LIBOR) \| Commercial Paper \| Securitization Facility
Debt Instrument [Line Items]
Basis spread on variable rate			0.90%
Blended Rate Of LIBOR And Commercial Paper Rates Based On Weighted Average Advance \| Commercial Paper \| Securitization Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.88%
Minimum \| Secured Debt
Debt Instrument [Line Items]
Unused facility fee, as percentage of unused portion			0.20%
Minimum \| Federal Funds Rate Plus \| Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Maximum \| Secured Debt
Debt Instrument [Line Items]
Unused facility fee, as percentage of unused portion			0.40%
Maximum \| Eurodollar \| Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%