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DEBT AND FINANCING COSTS - Uncommitted Lines of Credit (Details) - Uncommitted Lines of Credit - Line of Credit
£ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
GBP (£)
Debt Instrument [Line Items]        
Line of credit outstanding $ 0   $ 0  
Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount $ 2,000,000 £ 296 $ 17,000,000 £ 199