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Subsequent events (Details) - $ / shares
3 Months Ended
Oct. 20, 2020
Jul. 21, 2020
Sep. 30, 2020
Sep. 30, 2019
Dividends [Abstract]        
Common stock, dividends declared (in dollars per share)     $ 0.12 $ 0.11
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 Q1 Dividend [Member]        
Dividends [Abstract]        
Dividends payable, date declared Oct. 20, 2020      
Common stock, dividends declared (in dollars per share) $ 0.12      
Dividends payable, date of record Nov. 13, 2020      
Dividends payable, date to be paid Nov. 30, 2020