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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Carrying value    
Fair value of financial instruments    
Cash and cash equivalents $ 19.5 $ 13.9
Accounts receivable, net 197.9 189.5
CCF - cash on deposit 31.2 31.2
Variable rate debt 99.0 55.0
Fixed rate debt 681.3 683.9
Fair Value Measurement    
Fair value of financial instruments    
Cash and cash equivalents 19.5 13.9
Accounts receivable, net 197.9 189.5
CCF - cash on deposit 31.2 31.2
Variable rate debt 99.0 55.0
Fixed rate debt 674.9 685.2
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)    
Fair value of financial instruments    
Cash and cash equivalents 19.5 13.9
Fair Value Measurement | Significant Observable Inputs (Level 2)    
Fair value of financial instruments    
Accounts receivable, net 197.9 189.5
CCF - cash on deposit 31.2 31.2
Variable rate debt 99.0 55.0
Fixed rate debt $ 674.9 $ 685.2