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COMMON SHARE CAPITAL - Public equity offering (Details) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 18, 2016 USD ($) | Mar. 15, 2016 $ / shares shares | Mar. 04, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2017 shares
COMMON SHARE CAPITAL |  |  |  |  |
Equity issuance (shares) | shares |  |  |  | 1,245,049,712 | 1,247,003,940
Gross proceeds | $ 287.7 |  |  |  |
Transaction costs | 12.0 |  |  |  |
Net proceeds | $ 275.7 |  |  | $ 275.7 |
Equity offering |  |  |  |  |
COMMON SHARE CAPITAL |  |  |  |  |
Equity issuance (shares) | shares |  |  | 83,400,000 |  |
Common stock par value (in dollars per share) | $ / shares |  |  | $ 3.00 |  |
Gross proceeds |  |  | $ 250.0 |  |
Over-allotment |  |  |  |  |
COMMON SHARE CAPITAL |  |  |  |  |
Equity issuance (shares) | shares |  | 12,500,000 |  |  |
Common stock par value (in dollars per share) | $ / shares |  | $ 3.00 |  |  |
Percentage of additional shares purchased due to options exercised by underwriters |  | 15 |  |  |

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