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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Fair value of financial instruments      
Restricted Cash $ 3.0   $ 8.7
Carrying value      
Fair value of financial instruments      
Cash and cash equivalents 19.5 $ 21.2  
Restricted Cash 3.0 7.2  
Variable rate debt 178.0 379.1  
Fixed rate debt 712.0 579.3  
Fair Value Measurement      
Fair value of financial instruments      
Cash and cash equivalents 19.5 21.2  
Restricted Cash 3.0 7.2  
Variable rate debt 178.0 379.1  
Fixed rate debt 708.9 585.9  
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)      
Fair value of financial instruments      
Cash and cash equivalents 19.5 21.2  
Restricted Cash 3.0 7.2  
Fair Value Measurement | Significant Observable Inputs (Level 2)      
Fair value of financial instruments      
Variable rate debt 178.0 379.1  
Fixed rate debt $ 708.9 $ 585.9