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Shareholders' equity - Equity incentive plan (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation expense | $	$ 20.4	$ 17.0
RSU's
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of RSU's granted (shares)	63,128	372,000
Trust acquired shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares held by the Trust at the beginning of the period (shares)	630,431	774,405
Acquired (shares)	154,131	180,594
Released on vesting (shares)	(331,672)	(324,568)
Number of shares held by the Trust at the end of the period (shares)	452,890	630,431

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

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-IssueDate 2023-01-01
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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

+ References

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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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Number Of Treasury Shares Purchased For Other Equity Instruments In Share-Based Payment Arrangement

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