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Stock-based compensation (Tables) | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of stock option activity | A summary of stock option activity during the six months ended June 30, 2025 is set out below:
| Six Months Ended June 30, 2025
| Shares arising out of options |  | Weighted average exercise price |  | Weighted average remaining contractual life (years) |  | Aggregate intrinsic value
Outstanding as of January 1, 2025 | 5,347,556 |  | $ | 35.31 |  |  | 4.4 |  | — |
Granted | — |  |  | — |  |  | — |  |  | — |
Forfeited | (53,600) |  |  | 44.90 |  |  | — |  |  | — |
Expired | — |  |  | — |  |  | — |  |  | — |
Exercised | (95,920) |  |  | 42.45 |  |  | — |  |  | 760
Outstanding as of June 30, 2025 | 5,198,036 |  | 35.08 |  |  | 3.9 |  | 51,271
Vested as of June 30, 2025 and expected to vest thereafter (Note a) | 5,150,532 |  | 34.96 |  |  | 3.9 |  | 51,245
Vested and exercisable as of June 30, 2025 | 4,370,186 |  | 33.05 |  |  | 3.5 |  | 50,293
Weighted average grant date fair value of grants during the period | — |  |  |  |  |  |  |
(a)Options expected to vest reflect an estimated forfeiture rate.
Schedule of restricted share units activity | A summary of RSU activity during the six months ended June 30, 2025 is set out below:
| Six Months Ended June 30, 2025
| Number of Restricted Share Units |  | Weighted Average Grant Date Fair Value
Outstanding as of January 1, 2025 | 2,134,269 |  | $ | 36.71 |
Granted | 1,104,063 |  | 48.14
Vested (Note a) | (786,502) |  |  | 37.25 |
Forfeited | (132,588) |  | 38.77
Outstanding as of June 30, 2025 | 2,319,242 |  | 41.85
Expected to vest (Note b) | 2,073,709 |  |
(a)784,514 RSUs vested during the six months ended June 30, 2025, in respect of which 485,218 shares (net of minimum statutory tax withholding) were issued. 1,988 RSUs vested in the six months ended June 30, 2025, shares in respect of which will be issued in 2025 after withholding shares to the extent of minimum statutory withholding taxes. (b)The number of RSUs expected to vest reflects the application of an estimated forfeiture rate.
Schedule of significant assumptions used in determining fair value of performance units | The fair value of each PU granted to employees in the six months ended June 30, 2024 and June 30, 2025 was estimated on the date of grant using the following valuation assumptions:
|  | Six months ended June 30, 2024 |  | Six months ended June 30, 2025
Dividend yield |  | 1.81% |  | 1.37 | %
Expected life (years) |  | 2.80 |  | 2.81
Risk-free rate for expected life |  | 4.37% |  | 3.89 | %
Volatility for expected life |  | 24.24% |  | 25.78 | %
Schedule of performance units activity | A summary of PU activity during the six months ended June 30, 2025 is set out below:
| Six months ended June 30, 2025
| Number of Performance Units |  | Weighted Average Grant Date Fair Value |  | Maximum Shares Eligible to Receive
Outstanding as of January 1, 2025 | 3,257,804 |  |  | $ | 39.77 |  |  | 6,204,877
Granted | 855,094 |  |  | 54.05 |  | 2,052,226
Vested (Note a) | (1,152,320) |  |  | 44.50 |  | (1,152,320)
Forfeited | (191,088) |  |  | 39.02 |  | (458,611)
Outstanding as of June 30, 2025 | 2,769,490 |  |  | 42.27 |  | 6,646,172
Expected to vest (Note b) | 2,864,300 |  |  |  |  |
(a)1,152,320 PUs vested during the six months ended June 30, 2025, in respect of which 737,027 shares (net of minimum statutory tax withholding) were issued during the six months ended June 30, 2025. (b)The number of PUs expected to vest is based on the probable achievement of the performance targets after considering an estimated forfeiture rate.

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- Definition Disclosure of components of Performance stock awards granted to employees, comprised of changes in the quantity of the shares granted, vested and allotted, forfeited and outstanding during the reporting period along with weighted average grant date fair value. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 50 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718-50/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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