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Related party transactions (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
[1]
Nov. 14, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]          
Financial Designation Successor Successor Predecessor Predecessor Predecessor
Warrants outstanding (in shares) 41,700,000 41,700,000      
Farallon Capital Management, L.L.C          
Related Party Transaction [Line Items]          
Shares issued   7,174,163      
Aggregate purchase price   $ 75.0      
Reference Price   $ 10.45352229      
Common stock exercisable term   365 days      
Warrants outstanding (in shares)   7,174,163      
Class of Warrant or Right, Amendment Fee Price of Warrants or Rights   $ 1.60      
Farallon Capital Management, L.L.C | Farallon Capital Management, L.L.C          
Related Party Transaction [Line Items]          
Ownership percentage   5.00%      
Maximum | Farallon Capital Management, L.L.C          
Related Party Transaction [Line Items]          
Additional shares of common stock   25,000,000      
Minimum | Farallon Capital Management, L.L.C          
Related Party Transaction [Line Items]          
Beneficial ownership percentage   9.90%      
[1] Predecessor periods are combined as disclosed in Note 1.