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Equity (Details 2) (Series J Preferred Stock, USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Series J Preferred Stock
      
Class of Stock [Line Items]      
Preferred stock issued $ 200.0    
Preferred stock, stated percentage 4.50%    
Preferred Stock Series, liquidation preference per share (in dollars per share) $ 50 $ 0 $ 50
Convertible preferred stock, shares issued upon conversion 3.9087    
Convertible preferred stock, conversion price (in dollars per share) $ 12.79