Asset retirement obligations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation [Line Items]
Asset retirement obligation, restoration assets, carrying value	$ 1.0	$ 0.7
Asset retirement obligation, restoration assets, amortization	0.1	$ 0.1
Accrual for environmental loss contingencies, gross	$ 1.4
Minimum
Asset Retirement Obligation [Line Items]
Accrual for environmental loss contingencies, discount rate	0.37%
Maximum
Asset Retirement Obligation [Line Items]
Accrual for environmental loss contingencies, discount rate	10.96%

Asset Retirement Obligation [Line Items]

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- Definition

Asset Retirement Obligation, Restoration Assets, Amortization

+ References

No definition available.

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- Definition

Asset Retirement Obligation, Restoration Assets, Carrying Value

+ References

No definition available.

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- Definition

Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.Y.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481931/410-30-50-7

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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.Y.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481931/410-30-50-7

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