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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Fair value of financial instruments      
Restricted Cash $ 3.0   $ 8.7
Carrying value      
Fair value of financial instruments      
Cash and cash equivalents 12.7 $ 21.2  
Restricted Cash 3.0 7.2  
Variable rate debt 123.0 379.1  
Fixed rate debt 700.6 579.3  
Fair Value Measurement      
Fair value of financial instruments      
Cash and cash equivalents 12.7 21.2  
Restricted Cash 3.0 7.2  
Variable rate debt 123.0 379.1  
Fixed rate debt 697.7 585.9  
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)      
Fair value of financial instruments      
Cash and cash equivalents 12.7 21.2  
Restricted Cash 3.0 7.2  
Fair Value Measurement | Significant Observable Inputs (Level 2)      
Fair value of financial instruments      
Variable rate debt 123.0 379.1  
Fixed rate debt $ 697.7 $ 585.9