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Long-term incentive plan (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-term incentive plan      
Threshold cash return on investment upon termination event to determine vesting of performance shares     $ 1,515.0
Amount contributed for cash payments to employees $ 7.0    
Amount agreed to pay employees upon achievement of the plan conditions 7.0 $ 5.9  
Recognized compensation expense $ 0.0 $ 0.0