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Commitments and contingencies (Details)
6 Months Ended
Nov. 30, 2018
plaintiff
Aug. 14, 2017
plaintiff
Oct. 05, 2016
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 13, 2016
USD ($)
Mar. 13, 2015
USD ($)
LTIP              
Loss Contingencies [Line Items]              
Amount accrued for long-term incentive plan       $ 0      
Payments for long-term incentive plan       $ 0      
Lone Star | Affiliated Entities              
Loss Contingencies [Line Items]              
Certain covered tax benefits paid by related party, percentage       85.00%      
Accrued liabilities related to tax receivable agreement       $ 77,400,000 $ 77,400,000    
Payments of liability related to tax receivable agreement       0      
Heidelberg              
Loss Contingencies [Line Items]              
Business acquisition, possible maximum earn out           $ 100,000,000.0 $ 100,000,000.0
Delaware Action | Pending Litigation              
Loss Contingencies [Line Items]              
Loss contingency, damages sought     $ 100,000,000.0        
Loss contingency liability       $ 0      
Securities Action and Derivative Actions              
Loss Contingencies [Line Items]              
Loss contingency, number of plaintiffs | plaintiff 2 4