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SHORT-TERM AND LONG-TERM DEBT (Interest rate information) (Details) | Jun. 30, 2021 Rate | Dec. 31, 2020 Rate
--- | --- | ---
Debt Disclosure [Abstract] |  |
Weighted average interest rate | 2.85% | 2.91%
US Dollar London Interbank Offered Rate ("LIBOR"), 3-Month, closing rate | 0.15% | 0.24%
Norwegian Interbank Offered Rate ("NIBOR"), 3-Month, closing rate | 0.20% | 0.49%

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- Definition The three month Norwegian interbank offered rate (NIBOR) which is the reference rate related to existing floating rate debt denominated in Norwegian kroner. + References No definition available. + Details
Name: | sfl_ThreeMonthNorwegianKronerNiborRate
Namespace Prefix: | sfl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The three month London interbank offered rate (LIBOR) which is the reference rate related to existing floating rate debt denominated in US dollars. + References No definition available. + Details
Name: | sfl_ThreeMonthUSDollarLiborRate
Namespace Prefix: | sfl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant