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Shareholders' Equity - Preferred shares (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 4 Months Ended 12 Months Ended
Jan. 01, 2018
Sep. 29, 2016
Nov. 30, 2017
Aug. 31, 2017
Nov. 30, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 02, 2018
Class of Stock [Line Items]                  
Preferred shares, par value per share           $ 0.01      
Average cost per share           $ 29.29 $ 25.96 $ 26.78  
Redemption of preferred shares           $ 0 $ 0 $ 92,555  
Series C Preferred Shares                  
Class of Stock [Line Items]                  
Preferred shares, dividend rate (as a percent) 6.75%                
Preferred shares, redemption price per share                 $ 25
Series E preferred shares                  
Class of Stock [Line Items]                  
Non-cumulative preferred shares   $ 450,000              
Preferred shares, dividend rate (as a percent)   5.25%              
Preferred shares, par value per share   $ 0.01              
Liquidation preference per share   25,000              
Preferred shares, redemption price per share   $ 25,000              
Series E depositary share equivalent                  
Class of Stock [Line Items]                  
Preference shares, number of shares issued   18.0              
Proportionate interest of preference shares, per depositary share   0.10%              
Liquidation preference per share   $ 25              
Preferred shares, redemption price per share   $ 25              
Series F Preferred Shares                  
Class of Stock [Line Items]                  
Preferred shares issued     $ 100,000 $ 230,000 $ 330,000        
Preferred shares, dividend rate (as a percent)         5.45%        
Preferred shares, par value per share     $ 0.01   $ 0.01        
Liquidation preference per share     25,000   25,000        
Preferred shares, redemption price per share     $ 25,000   $ 25,000        
Series F depositary share equivalent                  
Class of Stock [Line Items]                  
Preference shares, number of shares issued     13.2   13.2        
Proportionate interest of preference shares, per depositary share     0.10%   0.10%        
Liquidation preference per share     $ 25   $ 25        
Preferred shares, redemption price per share     $ 25   $ 25