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Share-based compensation - Summary of changes in share based compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restricted stock units |  |  |  |
Shares |  |  |  |
Outstanding, beginning of period (in shares) | 236,191 | 203,441 | 193,939 | 207,641
Granted (in shares) | 4,894 | 916 | 132,492 | 78,595
Vested (in shares) | (292) | 0 | (79,280) | (77,719)
Forfeited (in shares) | (11,018) | 0 | (17,376) | (4,160)
Outstanding, end of period (in shares) | 229,775 | 204,357 | 229,775 | 204,357
Total weighted-average grant-date fair value | $ 0.2 | $ 0.0 | $ 4.6 | $ 3.8
Weighted-average grant-date fair value per share |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 37.91 | $ 40.67 | $ 40.89 | $ 35.36
Granted (in dollars per share) | 44.61 | 37.90 | 34.37 | 47.99
Vested (in dollars per share) | 38.77 | 0 | 38.51 | 34.19
Forfeited (in dollars per share) | 38.74 | 0 | 40.01 | 35.81
Outstanding, end of period (in dollars per share) | $ 38.02 | $ 40.65 | $ 38.02 | $ 40.65
LTIP linked to TRS |  |  |  |
Shares |  |  |  |
Outstanding, beginning of period (in shares) | 100,053 | 90,616 | 89,222 | 96,402
Granted (in shares) | 1,533 | 0 | 45,743 | 24,630
Vested (in shares) | 0 | 0 | (32,355) | (29,409)
Forfeited (in shares) | (10,427) | 0 | (11,451) | (1,007)
Outstanding, end of period (in shares) | 91,159 | 90,616 | 91,159 | 90,616
Total weighted-average grant-date fair value | $ 0.1 | $ 0.0 | $ 1.9 | $ 1.2
Weighted-average grant-date fair value per share |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 42.89 | $ 42.08 | $ 42.10 | $ 39.62
Granted (in dollars per share) | 41.12 | 0 | 41.12 | 48.62
Vested (in dollars per share) | 0 | 0 | 38.20 | 39.51
Forfeited (in dollars per share) | 42.82 | 0 | 43.10 | 41.72
Outstanding, end of period (in dollars per share) | $ 42.87 | $ 42.08 | $ 42.87 | $ 42.08
LTIP awards linked to other performance conditions |  |  |  |
Shares |  |  |  |
Outstanding, beginning of period (in shares) | 335,702 | 336,344 | 220,715 | 403,768
Granted (in shares) | 6,133 | 0 | 182,977 | 98,522
Vested (in shares) | 0 | 0 | (43,155) | (135,804)
Increase above target (cancelled) (in shares) | 15,881 | (38,821) | 1,277 | (64,932)
Forfeited (in shares) | (41,711) | 0 | (45,809) | (4,031)
Outstanding, end of period (in shares) | 316,005 | 297,523 | 316,005 | 297,523
Total weighted-average grant-date fair value | $ 0.3 | $ 0.0 | $ 6.3 | $ 4.7
Weighted-average grant-date fair value per share |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 38.04 | $ 39.64 | $ 41.03 | $ 35.15
Granted (in dollars per share) | 44.49 | 0 | 34.33 | 48.10
Vested (in dollars per share) | 0 | 0 | 34.12 | 33.48
Increase above target (in dollars per share) | 42.92 | 34.12 | 31.71 | 34.12
Forfeited (in dollars per share) | 38.27 | 0 | 38.82 | 39.67
Outstanding, end of period (in dollars per share) | $ 38.38 | $ 40.37 | $ 38.38 | $ 40.37

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- Definition Represents the 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 during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan or when performance conditions met. + References No definition available. + Details
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- Definition Represents the total 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 No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Increase Above Target in Period (Cancelled) + 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 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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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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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