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SHAREHOLDERS' EQUITY - Dividends (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Common shares, dividends declared per share (in usd per share) | $ 1.61 | $ 1.57 | $ 1.53
Common shares, dividends paid per share (in usd per share) | 1.20 | 1.17 | 1.14
Series C 6.875% Preferred Shares |  |  |
Class of Stock [Line Items] |  |  |
Preferred shares, dividend declared per share (in usd per share) |  |  | 0.43
Preferred shares, dividends paid per share (in usd per share) |  |  | 0.43
Dividends paid in year following declaration (in usd per share) |  |  | 0
Series D 5.50% Preferred Shares |  |  |
Class of Stock [Line Items] |  |  |
Preferred shares, dividend declared per share (in usd per share) | 1.21 | 1.38 | 1.38
Preferred shares, dividends paid per share (in usd per share) | 1.03 | 1.03 | 1.03
Dividends paid in year following declaration (in usd per share) | 0.18 | 0.34 | 0.34
Series E 5.50% Preferred Shares |  |  |
Class of Stock [Line Items] |  |  |
Preferred shares, dividend declared per share (in usd per share) | 137.50 | 137.50 | 137.50
Preferred shares, dividends paid per share (in usd per share) | 103.13 | 103.13 | 103.13
Dividends paid in year following declaration (in usd per share) | 34.38 | 34.38 | 34.38
Common shares |  |  |
Class of Stock [Line Items] |  |  |
Dividends paid in year following declaration (in usd per share) | $ 0.41 | $ 0.40 | $ 0.39

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