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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%

X

- 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

X

- 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