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Shareholders' Equity (Details) (USD $)
 0 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended
Mar. 14, 2014
Mar. 31, 2014
director
period
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Retained Earnings
Mar. 31, 2013
Retained Earnings
Mar. 14, 2014
Common Shares
Nov. 14, 2013
Common Shares
Mar. 31, 2014
Common Shares
Jun. 27, 2013
Series C Preferred Stock
Mar. 31, 2004
Series C Preferred Stock
Mar. 31, 2014
Series C Preferred Stock
Jun. 27, 2013
Series D Preferred Stock
Dec. 27, 2012
Series D Preferred Stock
Dec. 31, 2006
Series D Preferred Stock
May 31, 2013
Series E Preferred Stock
Mar. 31, 2014
Series E Preferred Stock
Class of Stock [Line Items]                                  
Dividends declared, Per common share (usd per share)   $ 0.29 $ 0.28       $ 0.29                    
Dividends paid, Per common share (usd per share) $ 0.29                                
Dividends declared and paid, Preference shares   $ 5,595,000 $ 6,275,000   $ 5,595,000 $ 6,275,000                      
Dividends declared and paid, Common shares         11,899,000 12,329,000                      
Repurchase of shares                 3,000,000                
Repurchase of shares         278,252,000 109,501,000     277,100,000                
Common shares repurchased during period, Average cost per share                 $ 93.04                
Share repurchase program, Authorized aggregate amount               500,000,000                  
Share repurchase program, Remaining authorized aggregate amount                 408,710,000                
Proceeds from issuance of preference shares                     250,000,000       300,000,000 275,000,000  
Preference shares issued, Shares                     10,000,000       12,000,000 11,000,000  
Preferred Stock, No Par Value                     $ 25       $ 25 $ 25  
Stock Redeemed or Called During Period, Shares                   5,000,000     6,000,000 6,000,000      
Redemption price per share, on or after March 23, 2009                       $ 25         $ 25
Preference shares, Dividend rate                       6.08%       5.375%  
Preferred shares, Redemption amount, shares                         6,000,000        
Preferred shares, Amount of preferred dividends in arrears, equivalent number of periods, trigger   6                              
Preferred shares, Preferred stock dividends in arrears, triggered shareholder election right, number of directors   2                              
Preferred shares, Redemption amount                   $ 125,000,000     $ 150,000,000 $ 150,000,000      
Preferred shares, Shares outstanding   16,000,000   16,000,000           5,000,000     0 6,000,000