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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
May 31, 2016
May 31, 2015
Statement of Stockholders' Equity [Abstract]        
Dividends paid (USD per share) $ 0.02 $ 0.04 $ 0.04 $ 0.04