Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common stock dividends, share	$ 0.42	$ 0.42	$ 1.26	$ 1.16
Series A [Member]
Preferred stock dividends declared per share	894.444	894.444	2,663.888	2,760.506
Series B [Member]
Preferred stock dividends declared per share	223.61	223.61	665.97	663.54
Series F [Member]
Preferred stock dividends declared per share	406.25	406.25	1,218.75	1,218.75
Series H [Member]
Preferred stock dividends declared per share	321.88	321.88	965.64	965.64
Series I [Member]
Preferred stock dividends declared per share			640.625	640.625
Series J [Member]
Preferred stock dividends declared per share	662.50	662.50	1,325.00	1,325.00
Series K [Member]
Preferred stock dividends declared per share	$ 343.75	$ 343.75	$ 1,031.25	$ 1,031.25