Consolidated Statements of Equity (Parenthetical)		12 Months Ended
	Sep. 03, 2019	Dec. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares
Common dividends, per share amount (in usd per share)		$ 0.900	$ 1.500	$ 1.782
Reverse stock split ratio, common stock	0.3333
Series A Preferred Stock
Preferred dividends, per share amount (in usd per share)		1.375	1.375	1.375
Series L Preferred Stock
Preferred dividends, per share amount (in usd per share)		1.560	$ 1.738
Special Dividend
Common dividends, per share amount (in usd per share)		$ 42.00		$ 8.970