Condensed Consolidated Statements Of Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Common dividend per share	$ 0.325	$ 0.305
6.75% Series D Preferred Shares [Member]
Preferred dividend per share		$ 13.08
6.5% Series F Preferred Shares [Member]
Preferred dividend per share	$ 40.63	$ 40.63