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INVESTMENT IN ASSOCIATED COMPANIES (Narrative) (Details)
1 Months Ended 2 Months Ended 12 Months Ended
Aug. 26, 2021
subsidiary
Feb. 28, 2022
USD ($)
Sep. 30, 2021
USD ($)
Aug. 31, 2021
USD ($)
Feb. 28, 2021
Oct. 31, 2020
USD ($)
Oct. 31, 2013
USD ($)
Jun. 30, 2013
drillingRig
May 31, 2013
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
drillingRig
Dec. 31, 2019
USD ($)
Dec. 31, 2017
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
drillingRig
Aug. 27, 2021
USD ($)
Mar. 31, 2021
drillingRig
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]                                        
Proportion of secured bank lenders in restructuring agreement with Seadrill Limited                                       97.00%
Proportion of bondholders in restructuring agreement with Seadrill Limited                                       40.00%
Number of drilling units | drillingRig                       3                
Bareboat charter revenues, per day       $ 64,700                                
Bareboat charter revenues, per day, after emergence date       60,000                                
Bareboat charter revenues, per day, other scenarios       $ 40,000                                
Loss on sale of recycling of the rig                     $ (39,405,000) $ (2,250,000) $ 0              
Gain on extinguishment of debt                     (727,000) 67,533,000 $ 1,802,000              
Long-term debt                   $ 1,663,394,000 1,903,755,000 1,663,394,000                
Subsequent Event                                        
Schedule of Equity Method Investments [Line Items]                                        
Bareboat charter revenues, per day   $ 55,000                                    
Financial Guarantee                                        
Schedule of Equity Method Investments [Line Items]                                        
Guarantor obligations, current carrying value                   $ 83,100,000 83,100,000 83,100,000           $ 83,100,000    
SFL Hercules                                        
Schedule of Equity Method Investments [Line Items]                                        
Final dividend distribution                     0                  
SFL Hercules | Financial Guarantee                                        
Schedule of Equity Method Investments [Line Items]                                        
Cash contribution                                   5,000,000    
Seadrill | Financial Guarantee                                        
Schedule of Equity Method Investments [Line Items]                                        
Accounts Payable                                   3,000,000    
River Box                                        
Schedule of Equity Method Investments [Line Items]                                        
Final dividend distribution                     2,200,000                  
Minimum | West Linus and West Hercules                                        
Schedule of Equity Method Investments [Line Items]                                        
Expected percentage of revenue to be collected under existing charter agreements (as percent)         65.00%         65.00%                    
Maximum | West Linus and West Hercules                                        
Schedule of Equity Method Investments [Line Items]                                        
Expected percentage of revenue to be collected under existing charter agreements (as percent)         75.00%         75.00%                    
SFL Linus & SFL Deepwater                                        
Schedule of Equity Method Investments [Line Items]                                        
Number of subsidiaries for which company is primary beneficiary | subsidiary 2                                      
SFL Deepwater                                        
Schedule of Equity Method Investments [Line Items]                                        
Participation in equity method investee (percent)                         100.00%       100.00%      
Number of main assets subject of leases which includes both fixed price call options and fixed price purchase obligations | drillingRig                                 2   1  
Debt amount             $ 390,000,000                          
Debt instrument, term             5 years                          
Term loan facility, extension term                           4 years            
Debt instrument, repurchased face amount           $ 176,100,000                            
Facility repurchased amount           110,000,000                            
Gain on extinguishment of debt           66,100,000                            
Long-term debt                   $ 0 0 $ 0                
SFL Deepwater | SFL Hercules                                        
Schedule of Equity Method Investments [Line Items]                                        
Number of main assets subject of leases which includes both fixed price call options and fixed price purchase obligations, transferred | drillingRig               1                        
SFL Linus                                        
Schedule of Equity Method Investments [Line Items]                                        
Participation in equity method investee (percent)                         100.00%   100.00%          
Debt amount             $ 475,000,000                          
Debt instrument, term             5 years                          
Term loan facility, extension term                           4 years            
Long-term debt           $ 216,000,000                            
SFL Hercules                                        
Schedule of Equity Method Investments [Line Items]                                        
Participation in equity method investee (percent)                       100.00% 100.00%     100.00%        
Debt amount                 $ 375,000,000                      
Debt instrument, term                 6 years                      
Term loan facility, extension term                           4 years            
Long-term debt                                   $ 175,000,000    
Extension term                           13 months            
West Taurus                                        
Schedule of Equity Method Investments [Line Items]                                        
Loss on sale of recycling of the rig     $ 600,000               $ 600,000