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Share-based payments (Summary of Share Unit Activity) (Details) | 9 Months Ended
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Sep. 30, 2021 $ / shares shares
Performance Share Units [Member] | Equity Securities [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Outstanding beginning balance, Shares | shares | 542,676
Granted, Shares | shares | 142,847
Vested and settled, Shares | shares | (161,248)
Forfeited, Shares | shares | (16,878)
Outstanding ending balance, Shares | shares | 507,397
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares | $ 38.09
Granted, Weighted average grant date fair value (per share) | $ / shares | 56.55
Vested and settled, Weighted average grant date fair value (per share) | $ / shares | 31.14
Forfeited, Weighted average grant date fair value (per share) | $ / shares | 47.36
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares | $ 45.18
Performance Share Units With Market Conditions [Member] | Equity Securities [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted, Shares | shares | 88,305
Outstanding ending balance, Shares | shares | 88,305
Granted, Weighted average grant date fair value (per share) | $ / shares | $ 65.45
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares | $ 65.45
Restricted Share Units [Member] | Equity Securities [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Outstanding beginning balance, Shares | shares | 134,937
Granted, Shares | shares | 29,805
Vested and settled, Shares | shares | (88,348)
Forfeited, Shares | shares | (6,347)
Outstanding ending balance, Shares | shares | 70,047
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares | $ 39.14
Granted, Weighted average grant date fair value (per share) | $ / shares | 56.55
Vested and settled, Weighted average grant date fair value (per share) | $ / shares | 33.20
Forfeited, Weighted average grant date fair value (per share) | $ / shares | 58.58
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares | $ 52.28
Deferred Share Units [Member] | Debt securities |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Outstanding beginning balance, Shares | shares | 137,514
Granted, Shares | shares | 14,569
Outstanding ending balance, Shares | shares | 152,083
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares | $ 32.06
Granted, Weighted average grant date fair value (per share) | $ / shares | 56.42
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares | $ 34.39

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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Exercises In Period, 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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