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Fair Value Measurements (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 14, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 1991
Dec. 31, 1990
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Percentage of stock redeemed 54.50%          
Preferred stock dividend rate per annum   12.00% 12.00%      
Senior Redeemable Preferred Stock [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Redemption price of senior preferred stock $ 2.0          
Carrying amount of senior redeemable preferred stock   $ 2.0       $ 2.0
Preferred stock dividend rate per annum   14.125% 14.125%      
Public Preferred Stock [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Preferred stock dividend rate per annum   12.00% 12.00% 6.00% 6.00%  
Public preferred stock par value (in dollar per share)   $ 0.01        
Carrying value of public preferred stock   $ 123.9 $ 120.1      
Estimate of Fair Value, Fair Value Disclosure [Member] | Public Preferred Stock [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Public preferred stock   $ 32.3 $ 43.0