Equity and Accumulated Other Comprehensive Loss, Net (6.625% Series F Cumulative Convertible Preferred Stock Narrative) (Details) - Series F Preferred Stock and Unit $ / shares in Units, $ in Millions		12 Months Ended
	Jun. 29, 2012 $ / shares	Dec. 31, 2015 USD ($) quarter $ / shares shares	Dec. 31, 2014 $ / shares shares
Class of Stock [Line Items]
Preferred stock, shares issued (in shares) | shares		7,300,000	7,300,000
Preferred stock, dividend rate		6.625%	6.625%
Gross proceeds from issuance of redeemable preferred stock | $		$ 176.2
Annual rate of dividend per share (in dollars per share)		$ 1.65625
Preferred stock, liquidation preference per share/unit		25.00	$ 25
Preferred stock, dividends in arrears per share	$ 0.395660
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		0.6843