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Shareholders' Equity - Roll-forward of changes in issued and outstanding common shares (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 31, 2018
Apr. 30, 2018
Common Shares:          
Shares issued, beginning of year 574,617,195 570,737,283 549,872,226    
Shares issued [1] 2,646,164 2,835,994 2,757,506    
Conversion of Series D preferred shares [2] 0 0 17,022,600    
Restricted shares issued, net of cancellations 1,737,482 1,043,918 1,084,951    
Shares issued, end of year 579,000,841 574,617,195 570,737,283    
Common shares held in treasury, end of year (172,280,199) (168,997,994) (168,282,449)    
Common shares outstanding, end of year 406,720,642 405,619,201 402,454,834    
Authorized and Issued:          
Common shares authorized 1,800,000,000     1,800,000,000 600,000,000
Common shares, par value per share $ 0.0011 $ 0.0011   $ 0.0011 $ 0.0033
Preferred shares authorized 50,000,000        
Preferred shares, par value per share $ 0.01        
[1] Includes shares issued from the exercise of stock options and stock appreciation rights, the vesting of restricted share units and shares issued from the employee share purchase plan.
[2] Such shares represent common shares that were issued upon conversion of the non-voting common equivalent preference shares issued in connection with the AIG acquisition.