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Shareholders' Equity - Roll-forward of changes in issued and outstanding common shares (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2018
Apr. 30, 2018
Common Shares:          
Shares issued, beginning of year 570,737,283 549,872,226 523,932,303    
Shares issued [1] 2,835,994 2,757,506 3,388,344    
Conversion of Series D preferred shares [2] 0 17,022,600 21,265,860    
Restricted shares issued, net of cancellations 1,043,918 1,084,951 1,285,719    
Shares issued, end of year 574,617,195 570,737,283 549,872,226    
Common shares held in treasury, end of year (168,997,994) (168,282,449) (156,938,409)    
Common shares outstanding, end of year 405,619,201 402,454,834 392,933,817    
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, 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.