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Accounts Receivable - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maximum undivided ownership interest pooled accounts receivable amount sold | $ 950,000,000
Securitization Facility |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Securitized accounts receivable facility | $ 950,000,000

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- Definition Maximum undivided ownership interest pooled accounts receivable amount sold. + References No definition available. + Details
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Namespace Prefix: | flt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=flt_ReceivablesSecuritizationFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |