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INVESTMENTS IN ASSOCIATED COMPANIES (Summary) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) drillingRig Rate | Jun. 30, 2020 USD ($) Rate | Dec. 31, 2020 USD ($) Rate | Dec. 31, 2019 numberOfDrillingUnits
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of drilling units | drillingRig | 2 |  |  |
SFL Hercules Ltd (“SFL Hercules”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from dividends received | $ | $ 0 |  |  |
SFL Deepwater, SFL Hercules And SFL Linus |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from dividends received | $ |  | $ 0 | $ 0 |
Number of drilling units | numberOfDrillingUnits |  |  |  | 3
River Box Holding Inc. ("River Box") |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Participation in equity method investee (in percentage) | 49.90% |  | 49.90% |
SFL Deepwater Ltd (“SFL Deepwater”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Participation in equity method investee (in percentage) |  | 100.00% |  |
SFL Hercules Ltd (“SFL Hercules”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Participation in equity method investee (in percentage) | 100.00% | 100.00% | 100.00% |
SFL Linus Ltd (“SFL Linus”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Participation in equity method investee (in percentage) |  | 100.00% |  |

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