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Other assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Other assets    
Energy well equipment, net $ 9.3 $ 10.2
Right-of-use assets, net 2.5  
Furniture and fixtures, net 0.4 0.5
Debt issue costs 1.9  
Other assets $ 14.1 $ 10.7