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EARNINGS PER SHARE - Narrative (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock compensation plan        
Anti-dilutive securities        
Anti-dilutive securities excluded from the computation of earnings per share (in shares) 1.2 2.2 1.2 1.7
April 2018 Stock Repurchase Program        
Anti-dilutive securities        
Outstanding amount of contract (in shares) 0.3   0.3