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Cumulative Preferred Stock (Characteristics of the First Preferred Shares) (Details) - $ / shares
 12 Months Ended
Aug. 15, 2020
Jul. 16, 2020
Dec. 31, 2020
Dec. 31, 2019
Series A Preferred Stock        
Class of Stock [Line Items]        
Initial Yield   2.182% 4.40%  
Current Annual Dividend $ 0.5456   $ 0.6388  
Earliest Redemption and/or Conversion Option Date     Aug. 15, 2025  
Redemption Value     $ 25  
Preferred Stock, Conversion Basis     Right to Convert on a one for one basis  
Conversion of Stock, Type of Stock Converted     Series B  
Series A Preferred Stock | Minimum        
Class of Stock [Line Items]        
Initial Yield     1.84%  
Series A Preferred Stock | Maximum        
Class of Stock [Line Items]        
Redemption Value     $ 25  
Series C Preferred Stock        
Class of Stock [Line Items]        
Initial Yield     4.10%  
Current Annual Dividend 1.1802   $ 1.1802 $ 1.0505
Earliest Redemption and/or Conversion Option Date     Aug. 15, 2023  
Redemption Value     $ 25  
Preferred Stock, Conversion Basis     Right to Convert on a one for one basis  
Conversion of Stock, Type of Stock Converted     Series D  
Series C Preferred Stock | Minimum        
Class of Stock [Line Items]        
Initial Yield     2.65%  
Series C Preferred Stock | Maximum        
Class of Stock [Line Items]        
Redemption Value     $ 25  
Series F Preferred Stock        
Class of Stock [Line Items]        
Initial Yield     4.202%  
Current Annual Dividend $ 1.0505   $ 1.0625  
Earliest Redemption and/or Conversion Option Date     Feb. 15, 2025  
Redemption Value     $ 25  
Preferred Stock, Conversion Basis     Right to Convert on a one for one basis  
Conversion of Stock, Type of Stock Converted     Series G  
Right to Convert on a one for one basis     The holders of the Series F Shares have the right, at their option, to convert all or any of their Series F Shares, on a one-for-one basis, into Cumulative Floating Rate First Preferred Shares, Series G of the Company on February 15, 2020, or to continue to hold their Series F Shares.  
Series F Preferred Stock | Minimum        
Class of Stock [Line Items]        
Initial Yield     2.63%  
Series F Preferred Stock | Maximum        
Class of Stock [Line Items]        
Redemption Value     $ 25  
Series B Preferred Stock        
Class of Stock [Line Items]        
Initial Yield   2.021% 2.393%  
Earliest Redemption and/or Conversion Option Date     Aug. 15, 2025  
Redemption Value     $ 25  
Preferred Stock, Conversion Basis     Right to Convert on a one for one basis  
Conversion of Stock, Type of Stock Converted     Series A  
Series B Preferred Stock | Minimum        
Class of Stock [Line Items]        
Initial Yield     1.84%  
Series H Preferred Stock        
Class of Stock [Line Items]        
Initial Yield     4.90%  
Current Annual Dividend     $ 1.225  
Earliest Redemption and/or Conversion Option Date     Aug. 15, 2023  
Redemption Value     $ 25  
Preferred Stock, Conversion Basis     Right to Convert on a one for one basis  
Conversion of Stock, Type of Stock Converted     Series I  
Series H Preferred Stock | Minimum        
Class of Stock [Line Items]        
Initial Yield     4.90%  
Series H Preferred Stock | Maximum        
Class of Stock [Line Items]        
Redemption Value     $ 25  
Series I Preferred Stock | Minimum        
Class of Stock [Line Items]        
Initial Yield     2.54%  
Perpetual fixed rate Series E Preferred Stock        
Class of Stock [Line Items]        
Initial Yield     4.50%  
Current Annual Dividend     $ 1.125  
Redemption Value     $ 25.75