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Stock-based compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of stock option activity | A summary of stock option activity during the three months ended March 31, 2024 is set out below:
| Three Months Ended March 31, 2024
| Shares arising out of options |  | Weighted average exercise price |  | Weighted average remaining contractual life (years) |  | Aggregate intrinsic value
Outstanding as of January 1, 2024 | 5,998,148 |  | 35.77 |  |  | 5.5 |  | — |
Granted | — |  |  | — |  |  | — |  |  | — |
Forfeited | (205,251) |  |  | 45.16 |  |  | — |  |  | — |
Expired | — |  |  | — |  |  | — |  |  | — |
Exercised | (135,051) |  |  | 29.11 |  |  | — |  |  | 519
Outstanding as of March 31, 2024 | 5,657,846 |  | 35.59 |  |  | 5.2 |  | 12,471
Vested as of March 31, 2024 and expected to vest thereafter (Note a) | 5,502,879 |  | 35.28 |  |  | 5.2 |  | 12,471
Vested and exercisable as of March 31, 2024 | 4,377,654 |  | 32.28 |  |  | 4.7 |  | 12,471
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 three months ended March 31, 2024 is set out below:
| Three Months Ended March 31, 2024
| Number of Restricted Share Units |  | Weighted Average Grant Date Fair Value
Outstanding as of January 1, 2024 | 1,036,616 |  | 42.87
Granted | 1,493,235 |  | 33.90
Vested (Note a) | (314,504) |  |  | 43.12 |
Forfeited | (56,191) |  | 43.27
Outstanding as of March 31, 2024 | 2,159,156 |  | 36.62
Expected to vest (Note b) | 1,910,656 |  |
(a)314,504 RSUs vested during the three months ended March 31, 2024 in respect of which 200,833 shares (net of minimum statutory tax withholding) were issued during the three months ended March 31, 2024. (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 2024 PU granted to employees was estimated on the date of grant using the following valuation assumptions:
|  | Three months ended March 31, 2024
Dividend yield |  | 1.81 | %
Expected life (years) |  | 2.80
Risk-free rate for expected life |  | 4.37 | %
Volatility for expected life |  | 24.24 | %
Schedule of performance units activity | A summary of PU activity during the three months ended March 31, 2024 is set out below:
| Three Months Ended March 31, 2024
| Number of Performance Units |  | Weighted Average Grant Date Fair Value |  | Maximum Shares Eligible to Receive
Outstanding as of January 1, 2024 | 3,649,599 |  |  | 44.32 |  | 4,977,057
Granted | 1,169,617 |  |  | 32.22 |  | 2,807,081
Vested (Note a) | (1,362,776) |  |  | 44.13 |  | (1,362,776)
Forfeited | (154,151) |  |  | 44.39 |  | (257,022)
Outstanding as of March 31, 2024 | 3,302,289 |  |  | 40.11 |  | 6,164,340
Expected to vest (Note b) | 3,324,581 |  |  |  |  |
(a)1,362,776 PUs vested during the three months ended March 31, 2024, in respect of which 869,713 shares (net of minimum statutory tax withholding) were issued during the three months ended March 31, 2024. (b) The number of PUs expected to vest reflects the application of 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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://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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