Equity and Accumulated Other Comprehensive Loss, Net (5.875% Series G Cumulative Convertible Preferred Stock Narrative) (Details) - Series G Preferred Stock and Unit $ / shares in Units, $ in Millions			12 Months Ended
	Jun. 28, 2013 $ / shares	Apr. 09, 2013 USD ($) shares	Dec. 31, 2015 quarter $ / shares shares	Dec. 31, 2014 $ / shares shares
Class of Stock [Line Items]
Preferred stock, shares issued (in shares) | shares		10,000,000	10,000,000	10,000,000
Preferred stock, dividend rate		5.875%	5.875%	5.875%
Gross proceeds from issuance of redeemable preferred stock | $		$ 250.0
Annual rate of dividend per share (in dollars per share)	$ 0.334550		$ 1.46875
Preferred stock, liquidation preference per share/unit			25	$ 25
Preferred stock, redemption price per share (in dollars per share)			$ 25.00
Number of quarters with no dividends triggering voting rights | quarter			6
Shares issued upon conversion | shares			0.7532