SHAREHOLDERS' EQUITY (Dividends) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Cash dividends declared per common share (in usd per share)	$ 0.41	$ 0.40	$ 1.23	$ 1.20
Dividends paid in period of declaration (in usd per share)	0	0	0.82	0.80
Dividends paid in period following declaration (in usd per share)	0.41	0.40	0.41	0.40
Series D preferred shares
Class of Stock [Line Items]
Cash dividends declared per preferred share (in usd per share)		0.34		1.03
Dividends paid in period of declaration (in usd per share)		0		0.69
Dividends paid in period following declaration (in usd per share)		0.34		0.34
Series E preferred shares
Class of Stock [Line Items]
Cash dividends declared per preferred share (in usd per share)	34.38	34.38	103.13	103.13
Dividends paid in period of declaration (in usd per share)	0	0	68.75	68.75
Dividends paid in period following declaration (in usd per share)	$ 34.38	$ 34.38	$ 34.38	$ 34.38