Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Dividends on common stock and dividend equivalents declared (in dollars per share)	$ 0.73	$ 0.59
Series E Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)		$ 667.1875
Series F Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)	$ 656.25