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Subsequent events (Details) - $ / shares
 9 Months Ended 12 Months Ended
Nov. 02, 2020
Sep. 02, 2020
May 26, 2020
Feb. 25, 2020
Nov. 14, 2019
Aug. 29, 2019
May 28, 2019
Feb. 26, 2019
Sep. 30, 2020
Dec. 31, 2019
Dividend Payment [Abstract]                    
Per common share (in dollars per share)   $ 0.48 $ 0.35 $ 0.32 $ 0.05 $ 0.02 $ 0.08 $ 0.05 $ 1.15 $ 0.20
Subsequent events [Member]                    
Dividend Payment [Abstract]                    
Per common share (in dollars per share) $ 0.20                  
Dividend payable, record date Nov. 18, 2020                  
Dividend payable date Nov. 25, 2020