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Subsequent events (Details) - $ / shares
12 Months Ended
Jul. 21, 2021
Jun. 30, 2021
Jun. 30, 2020
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share)   $ 0.48 $ 0.44
2020 Annual Dividend [Member]      
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share)   $ 0.48  
Subsequent Event [Member] | 2021 Q4 Dividend [Member]      
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share) $ 0.13    
Dividends payable, date declared Jul. 21, 2021    
Dividends payable, date of record Aug. 16, 2021    
Dividends payable, date paid Aug. 31, 2021    
Subsequent Event [Member] | 2021 Annual Dividend [Member]      
Dividends [Abstract]      
Common stock, dividends declared (in dollars per share) $ 0.52    
Percentage of increase in cash dividend rate 8.30%