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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair value of financial instruments    
Restricted Cash $ 8.9  
Carrying value    
Fair value of financial instruments    
Cash and cash equivalents 15.4 $ 19.6
Restricted Cash 8.9 4.9
Variable rate debt 255.0 235.0
Fixed rate debt 613.1 621.4
Fair Value Measurement    
Fair value of financial instruments    
Cash and cash equivalents 15.4 19.6
Restricted Cash 8.9 4.9
Variable rate debt 255.0 235.0
Fixed rate debt 594.1 584.5
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)    
Fair value of financial instruments    
Cash and cash equivalents 15.4 19.6
Restricted Cash 8.9 4.9
Fair Value Measurement | Significant Observable Inputs (Level 2)    
Fair value of financial instruments    
Variable rate debt 255.0 235.0
Fixed rate debt $ 594.1 $ 584.5