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Accounts and Other Receivables - Narrative (Details) - USD ($) $ in Billions | Sep. 30, 2022 | Aug. 18, 2022 | Aug. 17, 2022
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Securitization Facility |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Securitized accounts receivable facility | $ 1.7 | $ 1.7 | $ 1.6

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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
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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: |