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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Millions
7 Months Ended 12 Months Ended
Dec. 31, 2016
May 31, 2016
May 31, 2015
May 31, 2014
Commitments and Contingencies Disclosure [Abstract]        
Operating Leases, Rent Expense, Net $ 19.2 $ 19.7 $ 17.5 $ 16.0