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COMMITMENTS AND CONTINGENCIES - COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]      
Operating Leases, Rent Expense $ 82.0 $ 76.7 $ 70.7