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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2018
Mar. 31, 2019
COMMITMENTS AND CONTINGENCIES    
Purchase orders outstanding for equipment, parts and supplies   $ 20.1
Contingencies    
Contingent gains recognized in consolidated financial statements   0.0
Litigation settlement $ 21.0  
Legal settlement paid   10.5
Litigation accrual   $ 10.5