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Financial risk management - D.1.2. Interest rate swap contracts (Details) - Interest rate swap - Interest rate risk
$ in Millions, kr in Billions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
SEK (kr)
Dec. 31, 2019
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Derivative notional amount $ 211.0 kr 2  
Derivative financial assets held for hedging 23.0    
Derivative financial liabilities held for hedging     $ (0.2)
El Salvador      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Derivative financial liabilities held for hedging (3.0)    
Costa Rica      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Derivative financial assets held for hedging 1.0    
Derivative financial liabilities held for hedging (5.0)   (14.0)
Colombia      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Derivative financial liabilities held for hedging $ (7.0)   $ 0.0