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Share-based payments (Narrative) (Details) |  | 12 Months Ended
--- | --- | ---
Aug. 12, 2021 $ / shares | Dec. 31, 2021 USD ($) D item $ / shares shares | Dec. 31, 2020 USD ($) D $ / shares shares | Dec. 31, 2019 USD ($) D $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
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% |  |
Stock Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award term |  | 10 years |  |
Remaining shares authorized for grant | shares |  | 4,705,117 | 6,442,360 |
Award vesting period |  | 3 years |  |
Weighted average share price of options exercised | $ / shares |  |  | $ 51.92 | $ 40.32
Weighted average grant date fair value of options granted | $ / shares |  | $ 12.72 | $ 8.69 | $ 7.52
Unrecognized compensation costs |  | $ 6,206,000 |  |
Unrecognized compensation costs, period for recognition |  | 2 years 1 month 6 days |  |
Proceeds from exercise of employee stock options |  | $ 16,250,000 | $ 44,128,000 | $ 41,094,000
Actual tax benefit realized from option exercise |  | 1,817,000 | 4,594,000 | 1,679,000
Performance Share Unit Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 11,206,000 |  |
Unrecognized compensation costs, period for recognition |  | 1 year 8 months 12 days |  |
Market value of shares vested and released |  | $ 0 | $ 0 | $ 774,000
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average share price of options exercised | $ / shares |  | $ 61.40 |  |
Number of plans | item |  | 3 |  |
Premium Priced Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average estimated grant date fair value | $ / shares |  | $ 8.59 |  |
Unrecognized compensation costs |  | $ 7,891,000 |  |
Unrecognized compensation costs, period for recognition |  | 2 years 9 months 18 days |  |
Performance Share Units [Member] |  |  |  |
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 | 20
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 5,030,000 |  |
Unrecognized compensation costs, period for recognition |  | 2 years 7 months 6 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% |  |  |
Restricted Share Units [Member] |  |  |  |
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 |  |
Restricted Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 2,316,000 |  |
Unrecognized compensation costs, period for recognition |  | 1 year 8 months 12 days |  |
Deferred Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 0 |  |
Number of trading days of volume weighted average price for fair value estimation | D |  | 20 |  |
Deferred Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] | Current Liabilities [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share unit liability |  | $ 10,056,000 | $ 9,597,000 |

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