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v3.21.2

Share-based payments (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 12, 2021 $ / shares | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2021 USD ($) D | Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of trading days of volume weighted average price for fair value estimation | D |  |  | 20 |
Maximum employee contribution, percentage |  |  | 4.00% |
Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employer matching contribution, percentage |  |  | 50.00% |
Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employer matching contribution, percentage |  |  | 100.00% |
Performance Share Unit Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Market value of shares vested and released |  |  | $ 0 | $ 0
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 7,052,000 | $ 7,052,000 |
Unrecognized compensation costs, period for recognition |  |  | 2 years 2 months 12 days |
Premium Priced Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average estimated grant date fair value | $ / shares |  | $ 7.24 |  |
Unrecognized compensation costs |  | $ 4,988,000 | $ 4,988,000 |
Unrecognized compensation costs, period for recognition |  |  | 2 years 10 months 24 days |
Performance Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | 12,193,000 | $ 12,193,000 |
Unrecognized compensation costs, period for recognition |  |  | 1 year 10 months 24 days |
Performance Share Units With Market Conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Weighted average grant-date fair value of awards | $ / shares | $ 65.45 |  |  |
Award holding period | 1 year |  |  |
Discount value | $ / shares | $ 5.90 |  |  |
Effective tax rate | 35.00% |  |  |
Unrecognized compensation costs |  | 5,516,000 | $ 5,516,000 |
Unrecognized compensation costs, period for recognition |  |  | 2 years 10 months 24 days |
Restricted Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | 1,798,000 | $ 1,798,000 |
Unrecognized compensation costs, period for recognition |  |  | 1 year 6 months |
Number of trading days of volume weighted average price for fair value estimation | D |  |  | 20 |
Deferred Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | 0 | $ 0 |
Share unit liability |  | $ 9,501,000 | $ 9,501,000 | $ 9,597,000

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