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Other assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other assets    
Energy well equipment, net $ 5.0 $ 9.3
Right-of-use assets, net 2.0 2.5
Furniture and fixtures, net 0.4 0.4
Debt issue costs 1.3 1.9
Other 4.9  
Other assets $ 13.6 $ 14.1