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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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