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RELATED PARTY TRANSACTIONS (Schedule of interest income on related party loan notes) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Front Circassia | Frontline Shipping
Related Party Transaction [Line Items]
Interest income	$ 0	$ 82
Front Page, Front Stratus, Front Serenade, Front Ariake | Frontline
Related Party Transaction [Line Items]
Interest income	$ 0	$ 97

X

- Definition

Amount of interest income earned from interest-bearing assets owed to the entity by related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=sfl_FrontlineShippingMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	sfl_VesselNameAxis=sfl_FrontPageFrontStratusFrontSerenadeFrontAriakeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type: