Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash dividends declared on common shares (in usd per share)	$ 0.185	$ 0.185	$ 0.555	$ 0.525
Series D Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	12.50	12.50	37.50	37.50
Series E Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	0.382813	0.382813	1.148439	1.148439
Series F Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	0.353125	0.353125	1.059375	1.059375
Series G Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	$ 0.351563	$ 0.53125	$ 1.054689	$ 0.53125