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Long-term loans (Details) - Term loan facility and revolving loan facility agreement - USD ($)
Jun. 02, 2021
Dec. 31, 2022
Dec. 31, 2021
Long-term loans      
Maturity term 5 years    
Aggregate commitments $ 1,000,000,000.0    
Commitment fee 0.20%    
Borrowings outstanding   $ 500,000,000.0 $ 200,000,000.0
Pledge   $ 0 $ 0
LIBOR      
Long-term loans      
Basis points 0.85%