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Expenses - Finance costs and income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
FINANCE INCOME
Interest income	$ 6.9	$ 7.5
FINANCE COSTS
Interest on senior unsecured notes	30.0	30.0
Accretion	4.7	4.7
Other finance costs	9.3	6.2
Total finance costs	44.0	40.9
Less: amounts included in cost of qualifying assets	(26.9)	(27.7)
Total finance costs	$ 17.1	$ 13.2

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 1
-IssueDate 2024-01-01
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X

- Definition

The amount of income associated with interest and other financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2024-01-01
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- Definition

The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2024-01-01
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X

- Definition

The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

+ References

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-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
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X

- Definition

It represents the accretion expense on decommissioning obligations.

+ References

No definition available.

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- Definition

Cost to Qualify Assets

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- Definition

Finance Costs, Gross

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