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Share-based payments (Summary of Share Unit Activity) (Details) - Performance Share Unit Plans [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Performance Share Units [Member] | Equity Securities [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding beginning balance, Shares | 428,724 | 670,288 | 434,248
Granted, Shares | 303,829 | 170,208 | 240,803
Transferred to (from) equity awards on modification, Shares |  |  | 257,659
Vested and settled, Shares | (156,238) | (251,883) | (212,263)
Forfeited, Shares | (33,639) | (159,889) | (50,159)
Outstanding ending balance, Shares | 542,676 | 428,724 | 670,288
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ 32.89 | $ 31.46 | $ 27.83
Granted, Weighted average grant date fair value (per share) | 42.09 | 36.13 | 35.63
Transferred to (from) equity awards on modification, WA grant date fair value (per share) |  |  | 31.30
Vested and settled, Weighted average grant date fair value (per share) | 31.94 | 30.33 | 33.78
Forfeited, Weighted average grant date fair value (per share) | 36.60 | 33.21 | 31.41
Outstanding ending balance, Weighted average grant date fair value (per share) | $ 38.09 | $ 32.89 | $ 31.46
Performance Share Units [Member] | Debt securities |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding beginning balance, Shares |  |  | 259,241
Granted, Shares |  |  |
Transferred to (from) equity awards on modification, Shares |  |  | (257,659)
Vested and settled, Shares |  |  |
Forfeited, Shares |  |  | (1,582)
Outstanding ending balance, Shares |  |  |
Outstanding beginning balance, Weighted average grant date fair value (per share) |  |  | $ 26.38
Granted, Weighted average grant date fair value (per share) |  |  |
Transferred to (from) equity awards on modification, WA grant date fair value (per share) |  |  | 26.38
Vested and settled, Weighted average grant date fair value (per share) |  |  |
Forfeited, Weighted average grant date fair value (per share) |  |  | $ 26.45
Outstanding ending balance, Weighted average grant date fair value (per share) |  |  |
Restricted Share Units [Member] | Equity Securities [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding beginning balance, Shares | 237,420 | 207,986 | 125,152
Granted, Shares | 45,781 | 36,350 | 91,251
Transferred to (from) equity awards on modification, Shares |  |  |
Vested and settled, Shares | (98,542) | (265) |
Forfeited, Shares | (49,722) | (6,651) | (8,417)
Outstanding ending balance, Shares | 134,937 | 237,420 | 207,986
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ 29.72 | $ 28.99 | $ 26.93
Granted, Weighted average grant date fair value (per share) | 51.36 | 35.40 | 32.10
Transferred to (from) equity awards on modification, WA grant date fair value (per share) |  |  |
Vested and settled, Weighted average grant date fair value (per share) | 27.68 | 31.98 |
Forfeited, Weighted average grant date fair value (per share) | 28.14 | 34.27 | 32.00
Outstanding ending balance, Weighted average grant date fair value (per share) | $ 39.14 | $ 29.72 | $ 28.99
Restricted Share Units [Member] | Debt securities |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding beginning balance, Shares |  |  | 4,666
Granted, Shares |  |  | 66
Transferred to (from) equity awards on modification, Shares |  |  |
Vested and settled, Shares |  |  | (4,732)
Forfeited, Shares |  |  |
Outstanding ending balance, Shares |  |  |
Outstanding beginning balance, Weighted average grant date fair value (per share) |  |  | $ 26.42
Granted, Weighted average grant date fair value (per share) |  |  | 34.70
Transferred to (from) equity awards on modification, WA grant date fair value (per share) |  |  |
Vested and settled, Weighted average grant date fair value (per share) |  |  | $ 26.54
Forfeited, Weighted average grant date fair value (per share) |  |  |
Outstanding ending balance, Weighted average grant date fair value (per share) |  |  |
Deferred Share Units [Member] | Debt securities |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding beginning balance, Shares | 118,368 | 113,435 | 93,487
Granted, Shares | 19,146 | 24,810 | 26,553
Transferred to (from) equity awards on modification, Shares |  |  |
Vested and settled, Shares |  | (19,877) | (6,605)
Forfeited, Shares |  |  |
Outstanding ending balance, Shares | 137,514 | 118,368 | 113,435
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ 29.64 | $ 28.16 | $ 26.32
Granted, Weighted average grant date fair value (per share) | 47.01 | 35.99 | 33.42
Transferred to (from) equity awards on modification, WA grant date fair value (per share) |  |  |
Vested and settled, Weighted average grant date fair value (per share) |  | 27.45 | 23.16
Forfeited, Weighted average grant date fair value (per share) |  |  |
Outstanding ending balance, Weighted average grant date fair value (per share) | $ 32.06 | $ 29.64 | $ 28.16

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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Transfers to (from) Equity Awards + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Transfers to (from) Equity Awards, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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