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Long-term debt - Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 2,158,192 $ 2,363,372
Other limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 176,993 160,964
Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,981,199 $ 1,979,125
Carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 2,180,007  
Carrying amount | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 11,775  
Carrying amount | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 12,424  
Carrying amount | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 312,576  
Carrying amount | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 13,654  
Carrying amount | 2026    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 13,785  
Carrying amount | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,815,793  
Carrying amount | Other limited recourse debt facilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 180,007  
Carrying amount | Other limited recourse debt facilities | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 11,775  
Carrying amount | Other limited recourse debt facilities | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 12,424  
Carrying amount | Other limited recourse debt facilities | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 12,576  
Carrying amount | Other limited recourse debt facilities | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 13,654  
Carrying amount | Other limited recourse debt facilities | 2026    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 13,785  
Carrying amount | Other limited recourse debt facilities | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 115,793  
Carrying amount | Unsecured notes    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 2,000,000  
Carrying amount | Unsecured notes | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 300,000  
Carrying amount | Unsecured notes | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | 2026    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 0  
Carrying amount | Unsecured notes | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 1,700,000