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v3.20.4

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.

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