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Risk management and financial instruments - Derivative Financial Instruments (Details) - Interest rate cap - USD ($)
Jun. 30, 2021
Dec. 31, 2020
May 11, 2018
Level 2 | Fair value, recurring basis      
Derivatives, Fair Value [Line Items]      
Derivative asset $ 0 $ 0  
Other Assets      
Derivatives, Fair Value [Line Items]      
Outstanding principal $ 3,500,000,000    
LIBOR cap      
Derivatives, Fair Value [Line Items]      
Applicable rate     2.87%