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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Feb. 17, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair value of financial instruments        
Restricted Cash   $ 3.9 $ 5.3 $ 5.3
CCF - cash on deposit $ 100.0 518.2    
Carrying value        
Fair value of financial instruments        
Cash and cash equivalents   249.8 282.4  
Restricted Cash   3.9 5.3  
Capital construction fund   518.2    
Fixed rate debt   517.5 629.0  
Fair Value Measurement        
Fair value of financial instruments        
Cash and cash equivalents   249.8 282.4  
Restricted Cash   3.9 5.3  
Capital construction fund   518.2    
Fixed rate debt   427.3 615.1  
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)        
Fair value of financial instruments        
Cash and cash equivalents   249.8 282.4  
Restricted Cash   3.9 5.3  
Capital construction fund   518.2    
Fair Value Measurement | Significant Observable Inputs (Level 2)        
Fair value of financial instruments        
Fixed rate debt   $ 427.3 $ 615.1