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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 15, 2016
Jun. 30, 2016
Jun. 15, 2016
Mar. 31, 2016
Mar. 15, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Aug. 02, 2016
Class of Stock [Line Items]                      
Dividends declared per common share (in usd per share)             $ 0.31 $ 0.30 $ 0.93 $ 0.9  
Dividends declared and paid, Preference shares             $ 5,595,000 $ 5,595,000 $ 16,786,000 $ 16,786,000  
Retained Earnings                      
Class of Stock [Line Items]                      
Dividends declared and paid, Preference shares                 16,786,000 16,786,000  
Dividends declared and paid, Common shares                 $ 38,886,000 $ 40,883,000  
Common Shares                      
Class of Stock [Line Items]                      
Dividends declared per common share (in usd per share)   $ 0.31   $ 0.31   $ 0.31          
Dividends paid per common share (in usd per share) $ 0.31   $ 0.31   $ 0.31            
Share repurchase program, Authorized amount                     $ 500,000,000
Common shares repurchased during period, Number of shares                 2.7    
Common shares repurchased during period, Aggregate amount                 $ 309,400,000    
Common shares repurchased during period, Average cost per share, in usd per share                 $ 112.87    
Share repurchase program, Remaining authorized aggregate amount $ 500,000,000           $ 500,000,000   $ 500,000,000