Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash dividends declared on Common Shares (in usd per share)	$ 0.185	$ 0.185	$ 0.370	$ 0.370
Series D Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	12.50	12.50	25.00	25.00
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	0.706250	0.706250
Series G Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	$ 0.351563	$ 0.53125	$ 0.703126	$ 0.703126