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Subsequent events (Details) - $ / shares
3 Months Ended 9 Months Ended
Apr. 21, 2021
Jan. 20, 2021
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dividends [Abstract]            
Common stock, dividends declared (in dollars per share)     $ 0.12 $ 0.11 $ 0.36 $ 0.33
2021 Annual Dividend [Member]            
Dividends [Abstract]            
Common stock, dividends declared (in dollars per share)   $ 0.48        
Subsequent Event [Member] | 2021 Annual Dividend [Member]            
Dividends [Abstract]            
Common stock, dividends declared (in dollars per share) $ 0.48          
Subsequent Event [Member] | 2021 Q3 Dividend [Member]            
Dividends [Abstract]            
Dividends payable, date declared Apr. 21, 2021          
Common stock, dividends declared (in dollars per share) $ 0.12          
Dividends payable, date of record May 15, 2021          
Dividends payable, date to be paid May 28, 2021