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Share-based compensation - Changes in Share Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Restricted stock units |  |  |  |
Shares |  |  |  |
Outstanding, beginning of period (in shares) | 90,903 | 202,133 | 189,024 | 182,528
Granted (in shares) | 0 | 0 | 0 | 100,088
Vested (in shares) | (1,034) | (1,035) | (98,084) | (81,112)
Forfeited (in shares) | 0 | (1,968) | (1,071) | (2,374)
Outstanding, end of period (in shares) | 89,869 | 199,130 | 89,869 | 199,130
Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) | $ 0.0 | $ 0.0 | $ 0.0 | $ 4.2
Weighted-average grant-date fair value per share |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 42.11 | $ 41.25 | $ 41.23 | $ 39.75
Granted (in dollars per share) | 0 | 0 | 0 | 42.41
Vested (in dollars per share) | 44.31 | 44.31 | 40.43 | 39.37
Forfeited (in dollars per share) | 0 | 42.49 | 41.97 | 41.79
Outstanding, end of period (in dollars per share) | $ 42.08 | $ 41.22 | $ 42.08 | $ 41.22
LTIP linked to TRS |  |  |  |
Shares |  |  |  |
Outstanding, beginning of period (in shares) | 109,643 | 80,006 | 76,477 | 71,574
Granted (in shares) | 0 | 0 | 62,152 | 27,123
Vested (in shares) | 0 | 0 | (28,577) | (18,691)
Forfeited (in shares) | (381) | (722) | (790) | (722)
Outstanding, end of period (in shares) | 109,262 | 79,284 | 109,262 | 79,284
Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) | $ 0.0 | $ 0.0 | $ 1.1 | $ 1.5
Weighted-average grant-date fair value per share |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 33.82 | $ 50.27 | $ 50.11 | $ 47.67
Granted (in dollars per share) | 0 | 0 | 17.28 | 55.98
Vested (in dollars per share) | 0 | 0 | 41.12 | 48.62
Forfeited (in dollars per share) | 55.66 | 48.92 | 55.64 | 48.92
Outstanding, end of period (in dollars per share) | $ 33.75 | $ 50.28 | $ 33.75 | $ 50.28
LTIP awards linked to other performance conditions |  |  |  |
Shares |  |  |  |
Outstanding, beginning of period (in shares) | 574,744 | 355,310 | 327,085 | 309,589
Granted (in shares) | 0 | 0 | 362,963 | 108,499
Vested (in shares) | 0 | 0 | (113,118) | (62,778)
Increase above target (cancelled) (in shares) | (11,407) | 6,001 | (11,953) | 6,001
Forfeited (in shares) | (1,525) | (3,834) | (3,165) | (3,834)
Outstanding, end of period (in shares) | 561,812 | 357,477 | 561,812 | 357,477
Total weighted-average grant-date fair value of shares granted (at target performance levels) (in millions) | $ 0.0 | $ 0.0 | $ 4.8 | $ 4.6
Weighted-average grant-date fair value per share |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 23.68 | $ 38.87 | $ 39.44 | $ 39.50
Granted (in dollars per share) | 0 | 0 | 13.09 | 42.41
Vested (in dollars per share) | 0 | 0 | 34.93 | 48.07
Increase above target (cancelled) (in dollars per share) | 42.37 | 36.08 | 42.32 | 36.08
Forfeited (in dollars per share) | 42.07 | 43.53 | 42.06 | 43.53
Outstanding, end of period (in dollars per share) | $ 23.25 | $ 38.78 | $ 23.25 | $ 38.78

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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 The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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