Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash dividends declared on common shares (in usd per share)	$ 0.185	$ 0.17	$ 0.370	$ 0.34
Series D Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	12.50	12.50	25	25
Series E Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	0.382813	0.382813	0.765626	0.765626
Series F Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	0.353125	$ 0.353125	0.70625	$ 0.70625
Series G Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	$ 0.351563		$ 0.703126