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Financial instruments and derivatives - Additional Information (Details) $ in Thousands, BTU in Millions		12 Months Ended
	Jan. 11, 2022 USD ($)	Dec. 31, 2022 USD ($) BTU t	Jan. 21, 2022 USD ($)	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Gain (loss) on settlement	$ 5,201
Anticipated usage percentage covered by a swap contract for the current fiscal year (percent)		$ (8,692)		$ 92
Unsecured Debt
Derivative [Line Items]
Debt			$ 150,000,000
Principal Amount			$ 1,200,000
Unsecured Debt | 2032 Notes
Derivative [Line Items]
Stated interest rate (percent)			2.85%
Principal Amount			$ 500,000
Cash Flow Hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Fair value of commodity cash flow hedges		(172)		1,491
Commodity gain (loss) expected to be reclassified to the income statement during the next 12 months		(145)
Fair value of foreign currency cash flow hedges		(299)		336
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months		$ (299)
Natural gas swaps
Derivative [Line Items]
Approximate amount of commodity covered by swap contracts outstanding (btu) | BTU		7.3
Natural gas swaps | Derivatives designated as hedging instruments
Derivative [Line Items]
Anticipated usage percentage covered by a swap contract for the next fiscal year (percent)		0.69
Derivative Nonmonetary Notional Amount Percent Of Required Need Coverage Year Two		17.00%
Natural gas swaps | Cash Flow Hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Approximate amount of commodity covered by swap contracts outstanding (btu) | BTU		0.2
Anticipated usage percentage covered by a swap contract for the next fiscal year (percent)		0.01
Forward Contracts | Cash Flow Hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Fair value of foreign currency cash flow hedges		$ (564)		$ (457)
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months		(564)
Foreign currency gain (loss) reclassified to the income statement		(875)
Interest Rate Lock Contract
Derivative [Line Items]
Gain or (Loss) Recognized		$ (550)
Aluminum Swaps | Cash Flow Hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Anticipated usage percentage covered by a swap contract for the next fiscal year (percent)		0.13
Approximate amount of commodity covered by swap contracts outstanding (tonne) | t		983

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