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Subsequent event (Details) - $ / shares
3 Months Ended 6 Months Ended
Jan. 26, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2021
Jan. 01, 2021
Subsequent Event [Line Items]          
Cash dividends declared per ordinary share (in dollars per share)   $ 0.70 $ 0.67 $ 1.37 $ 1.32
Common Stock | Subsequent Event          
Subsequent Event [Line Items]          
Cash dividends declared per ordinary share (in dollars per share) $ 0.70        
Dividends payable date Apr. 06, 2022        
Dividends payable, date of record Mar. 22, 2022