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Subsequent events (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 01, 2021
Aug. 26, 2021
May 26, 2021
Feb. 25, 2021
Nov. 25, 2020
Sep. 02, 2020
May 26, 2020
Feb. 25, 2020
Mar. 31, 2022
Sep. 30, 2021
Dec. 31, 2020
Oct. 22, 2021
Dividend Payment [Abstract]                        
Per common share (in dollars per share)   $ 0.02 $ 0.04 $ 0.05 $ 0.20 $ 0.48 $ 0.35 $ 0.32   $ 0.11 $ 1.35  
Subsequent events [Member]                        
Dividend Payment [Abstract]                        
Amount of distribution of equity to be returned to members by DNK                       $ 300.0
Per common share (in dollars per share) $ 0.02                      
Dividend payable date Nov. 23, 2021                      
Dividend payable, record date Nov. 16, 2021                      
Forecast [Member] | Bottom of range [member]                        
Dividend Payment [Abstract]                        
Amount of distribution of equity expected to be received                 $ 5.5      
Forecast [Member] | Top of range [member]                        
Dividend Payment [Abstract]                        
Amount of distribution of equity expected to be received                 $ 6.5