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Shareholders' Equity (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended
Jun. 13, 2014
Mar. 14, 2014
Jun. 30, 2014
director
period
Jun. 30, 2013
Jun. 30, 2014
director
period
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Retained Earnings
Jun. 30, 2013
Retained Earnings
May 20, 2014
Common Shares
Jun. 30, 2014
Common Shares
Jun. 27, 2013
Series C Preferred Stock
Mar. 31, 2004
Series C Preferred Stock
Jun. 30, 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
Jun. 30, 2014
Series E Preferred Stock
Jun. 30, 2013
Series E Preferred Stock
Class of Stock [Line Items]                                        
Dividends declared, Per common share $ 0.29 $ 0.29   $ 0.28 $ 0.58 $ 0.56                            
Dividends paid, Per common share $ 0.29 $ 0.29                                    
Dividends declared and paid, Preference shares     $ 5,596,000 $ 7,483,000 $ 11,191,000 $ 13,758,000   $ 11,191,000 $ 13,758,000                      
Dividends declared and paid, Common shares               23,550,000 24,658,000                      
Common shares repurchased during period, Number of shares                     3,400,000                  
Common shares repurchased during period, Aggregate amount               313,312,000 117,520,000   314,500,000                  
Common shares repurchased during period, Average cost per share                     $ 93.53                  
Share repurchase program, Authorized aggregate amount                   500,000,000                    
Share repurchase program, Remaining authorized aggregate amount                     500,000,000                  
Preferred shares, Proceeds from issuance                         250,000,000       300,000,000 275,000,000 0 265,655,000
Preferred shares, Shares issued                         10,000,000       12,000,000 11,000,000    
Preferred shares, Issued value per share     $ 1   $ 1   $ 1           $ 25       $ 25 $ 25    
Preferred shares, Number of shares redeemed or called                       5,000,000     6,000,000 6,000,000        
Preferred shares, Redemption price per share                           $ 25         $ 25  
Preferred 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   6                              
Preferred shares, Preferred stock dividends in arrears, triggered shareholder election right, number of directors     2   2                              
Preferred shares, Redemption amount                       $ 125,000,000     $ 150,000,000 $ 150,000,000        
Preferred shares, Shares outstanding     16,000,000   16,000,000   16,000,000         5,000,000     0 6,000,000