Condensed Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Common dividend (in dollars per share)	$ 0.690	$ 0.650
6.5% Series F Preferred Shares [Member]
Preferred dividend (in dollars per share)	$ 64.55	$ 81.25