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COMMON SHARE CAPITAL - Dividends on common shares (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Feb. 16, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
COMMON SHARE CAPITAL              
Dividend declared and paid, per share   $ 0.03 $ 0.03 $ 0.03 $ 0.03   $ 0.03
Dividend declared and paid, Total amount paid   $ 37.6 $ 37.8 $ 37.9 $ 37.8 $ 151.1 $ 75.5
Dividend declared, per share $ 0.03            
Dividend declared and unpaid   $ 0.0       $ 0.0 $ 0.0