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Financial instruments - North american natural gas forward contracts (Details)
MMBTU in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
MMBTU
Dec. 31, 2023
USD ($)
MMBTU
Disclosure of financial assets [line items]    
Amounts reclassified on discontinuation of hedging relationship $ 11,702,000 $ 0
Accumulated other comprehensive income    
Disclosure of financial assets [line items]    
Reclassification of hedge gain (loss) in cash flow hedge (76,000,000.0) (22,500,000)
North american natural gas forward contract    
Disclosure of financial assets [line items]    
Amounts reclassified on discontinuation of hedging relationship $ 11,700,000 $ 0
North american natural gas forward contract | Cash flow hedges    
Disclosure of financial assets [line items]    
Hedging instrument, energy (in mmbtu) | MMBTU 310,520 347,190
Notional amount $ 1,048,973,000 $ 1,183,319,000
Assets, fair value 89,632,000 29,925,000
North american natural gas forward contract | Cash flow hedges | Other current assets    
Disclosure of financial assets [line items]    
Assets, fair value 25,760,000 470,000
North american natural gas forward contract | Cash flow hedges | Other non-current assets    
Disclosure of financial assets [line items]    
Assets, fair value 100,683,000 120,638,000
North american natural gas forward contract | Cash flow hedges | Other current liabilities    
Disclosure of financial assets [line items]    
Liabilities, fair value (14,708,000) (60,532,000)
North american natural gas forward contract | Cash flow hedges | Other long-term liabilities    
Disclosure of financial assets [line items]    
Liabilities, fair value $ (22,103,000) $ (30,651,000)
North american natural gas forward contract | Cash flow hedges | Bottom of range    
Disclosure of financial assets [line items]    
Hedging instrument, daily energy annualized (in mmbtu) | MMBTU 50 50
North american natural gas forward contract | Cash flow hedges | Top of range    
Disclosure of financial assets [line items]    
Hedging instrument, daily energy annualized (in mmbtu) | MMBTU 210 170