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Share Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 04, 2021 shares | Feb. 23, 2021 installment shares | Feb. 01, 2021 shares | Mar. 05, 2020 | Feb. 28, 2018 | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) | Jan. 20, 2021 $ / shares | Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Voluntary termination of employment age limit |  |  |  |  |  | 57 |  |  |
Number of vesting installments | installment |  | 3 |  |  |  |  |  |  |
Vesting acceleration period |  | 1 year |  |  |  |  |  |  |
Restricted Share Rights Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted share rights outstanding (in shares) | shares |  |  |  |  |  | 770,988 |  |  | 488,735
Unrecognized compensation expenses | $ |  |  |  |  |  | $ 3.3 |  |  |
Weighted average period over which options will be recognized |  |  |  |  |  | 2 years 3 days |  |  |
Share-based compensation expense | $ |  |  |  |  |  | $ 2.3 | $ 1.9 |  |
Share-based compensation expense, capitalized | $ |  |  |  |  |  | $ 0.3 | 0.3 |  |
Granted (in shares) | shares | 252,278 |  |  |  |  | 301,545 |  |  |
Ratio of restricted share right will get settled for common share | 1 |  |  |  |  |  |  |  |
Accumulated service period for voluntary termination |  |  |  |  |  | 15 years |  |  |
Restricted Share Rights Awards | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 1 year |  |  |
Restricted Share Rights Awards | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  | 3 years |  |  |
Restricted Performance Share Units Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |
Unrecognized compensation expenses | $ |  |  |  |  |  | $ 10.0 |  |  |
Weighted average period over which options will be recognized |  |  |  |  |  | 2 years 3 months 14 days |  |  |
Share-based compensation expense | $ |  |  |  |  |  | $ 0.8 | 0.6 |  |
Share-based compensation expense, capitalized | $ |  |  |  |  |  | $ 0.1 | $ 0.1 |  |
Common shares issued for share based compensation (in shares) | shares |  |  | 82,513 |  |  |  |  |  |
Dividends payable (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.19 |
Executive Officer | Restricted Performance Share Units Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted share rights outstanding (in shares) | shares |  |  |  |  |  | 906,626 |  |  | 525,669
Granted (in shares) | shares |  |  |  |  |  | 380,957 |  |  |
Performance earning potential |  |  |  | 200.00% |  |  |  |  |
Outperformance feature measurement term |  |  |  | 3 years |  | 3 years |  |  |
Vesting period after outperformance feature measurement term |  |  |  |  |  | 2 years |  |  |
Executive Officer | Restricted Performance Share Units Plan | 2021 Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards issuable under outperformance feature (in shares) | shares |  |  |  |  |  | 388,840 |  |  |
Share-based compensation expense recognized to date | $ |  |  |  |  |  | $ 0.0 |  |  |
Executive Officer | Restricted Performance Share Units Plan | 2020 Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards issuable under outperformance feature (in shares) | shares |  |  |  |  |  | 316,236 |  |  |
Share-based compensation expense recognized to date | $ |  |  |  |  |  | $ 0.0 |  |  |
Executive Officer | Restricted Performance Share Units Plan | 2019 Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards issuable under outperformance feature (in shares) | shares |  |  |  |  |  | 228,858 |  |  |
Share-based compensation expense recognized to date | $ |  |  |  |  |  | $ 0.2 |  |  |
Non Officer Employees | Restricted Performance Share Units Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted share rights outstanding (in shares) | shares |  | 49,267 |  |  |  |  |  |  |

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