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EARNINGS PER SHARE AND DIVIDEND PER SHARE - Schedule of dividend per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DIVIDEND PER SHARE      
Dividend for the year $ 7.4 $ 0.0 $ 1.2
Number of shares, end of period 74.7 74.2 62.3
Dividend per share $ 0.10 $ 0.00 $ 0.02