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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Fair value of financial instruments      
Restricted Cash $ 5.3   $ 3.0
Carrying value      
Fair value of financial instruments      
Cash and cash equivalents 17.4 $ 14.4  
Restricted Cash 5.3 5.3  
Variable rate debt   71.8  
Fixed rate debt 661.5 688.3  
Fair Value Measurement      
Fair value of financial instruments      
Cash and cash equivalents 17.4 14.4  
Restricted Cash 5.3 5.3  
Variable rate debt   71.8  
Fixed rate debt 648.9 686.7  
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)      
Fair value of financial instruments      
Cash and cash equivalents 17.4 14.4  
Restricted Cash 5.3 5.3  
Fair Value Measurement | Significant Observable Inputs (Level 2)      
Fair value of financial instruments      
Variable rate debt   71.8  
Fixed rate debt $ 648.9 $ 686.7