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Capital disclosures (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of liquidity and capitalization [Line Items]      
Cash and cash equivalents $ 833,841,000 $ 416,763,000 $ 256,077,000
Total liquidity 1,760,841,000 1,516,763,000  
Total debt 2,363,372,000 1,768,853,000  
Non-controlling interests 292,357,000 298,675,000  
Shareholders’ equity 1,149,100,000 1,331,685,000  
Total capitalization $ 3,804,829,000 $ 3,399,213,000  
Total debt to capitalization 62.00% 52.00%  
Net debt to capitalization 51.00% 45.00%  
Revolving credit facility      
Disclosure of liquidity and capitalization [Line Items]      
Undrawn credit facilities $ 300,000,000 $ 300,000,000  
Construction facilities      
Disclosure of liquidity and capitalization [Line Items]      
Undrawn credit facilities 627,000,000 800,000,000  
Total debt 173,000,000    
G3 construction facility      
Disclosure of liquidity and capitalization [Line Items]      
Total debt 176,335,000 0  
Unsecured notes      
Disclosure of liquidity and capitalization [Line Items]      
Total debt 1,979,125,000 1,535,662,000  
Egypt limited recourse debt facilities      
Disclosure of liquidity and capitalization [Line Items]      
Total debt $ 46,948,000 75,165,000  
Ownership of subsidiary, percentage of inclusion 100.00%    
Other limited recourse debt facilities      
Disclosure of liquidity and capitalization [Line Items]      
Total debt $ 160,964,000 $ 158,026,000