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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Related Party Transaction, Revenues from Transactions with Related Party $ 0.3 $ 0.5 $ 0.6 $ 1.0  
Related Party Transaction, Due from (to) Related Party 0.2   0.2   $ 0.4
Related Party Transaction, Expenses from Transactions with Related Party $ 0.5 0.3 $ 1.0 $ 0.7  
Equity Method Investment, Ownership Percentage 21.40%   21.40%    
OTR Group [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Purchases from Related Party $ 0.0 $ 0.1 $ 0.3    
Valuepart and Track Solutions PTY Ltd. [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Revenues from Transactions with Related Party $ 0.1   $ 0.2