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Share-based payments (Narrative) (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 11, 2018 USD ($) $ / shares | Mar. 01, 2018 USD ($) $ / shares | Dec. 31, 2020 USD ($) D item $ / shares shares | Dec. 31, 2019 USD ($) D $ / shares shares | Dec. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation costs, period for recognition |  |  | 2 years |  |
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 |  |  | 6,442,360 | 7,222,978 |
Weighted average share price of options exercised | $ / shares |  |  |  | $ 40.32 | $ 35.08
Weighted average grant date fair value of options granted | $ / shares |  |  | $ 8.69 | $ 7.52 | $ 7.69
Unrecognized compensation costs |  |  | $ 4,424,000 |  |
Unrecognized compensation costs, period for recognition |  |  | 2 years 2 months 12 days |  |
Proceeds from exercise of employee stock options |  |  | $ 44,128,000 | $ 41,094,000 | $ 28,524,000
Actual tax benefit realized from option exercise |  |  | 4,594,000 | 1,679,000 | 2,793,000
Performance Share Unit Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Market value of shares vested and released |  |  | $ 0 | $ 774,000 | $ 410,000
Share unit liability, fair value attributable to past service |  | $ 6,701,000 |  |  |
Incremental compensation |  | $ 0 |  |  |
Modified performance vesting conditions, weighted average fair value | $ / shares |  | $ 31.35 |  |  |
Modified performance vesting conditions, incremental compensation recognized |  | $ 1,400,000 |  |  |
Award vesting period |  |  | 3 years |  |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average share price of options exercised | $ / shares |  |  | $ 51.92 |  |
Number of plans | item |  |  | 3 |  |
Performance Share Units, Equity Classified Awards [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Average expected volatility of comparable companies |  |  |  |  | 34.10%
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 |  |  | $ 10,447,000 |  |
Unrecognized compensation costs, period for recognition |  |  | 2 years |  |
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Modified performance vesting conditions, weighted average fair value | $ / shares | $ 43.34 |  |  |  |
Modified performance vesting conditions, incremental compensation recognized | $ 838,000 |  |  |  |
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 |  |  | $ 1,980,000 |  |
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] |  |  |  |  |
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 |  |  | $ 9,597,000 | $ 5,130,000 |

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