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Fair Value of Financial Instruments - Additional Information (Details) - Long-Term Credit Facility - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Line of credit facility amendment costs | $ 6.5 | $ 0.0 | $ 0.0
Net change in unrealized (appreciation) depreciation on debt | $ (2.3) | $ (4.9) |

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- Definition Line of credit facility amendment costs. + References No definition available. + Details
Name: | pflt_LineOfCreditFacilityAmendmentCosts
Namespace Prefix: | pflt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net change in unrealized (appreciation) depreciation on debt. + References No definition available. + Details
Name: | pflt_NetChangeInUnrealizedAppreciationDepreciationOnDebt
Namespace Prefix: | pflt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=pflt_LongTermCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |