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Other assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Other assets    
Amount receivable related to CRA audits $ 10.5 $ 4.9
Energy well equipment, net 5.2 5.0
Right-of-use assets, net 1.8 2.0
Debt issue costs 1.1 1.3
Furniture and fixtures, net 0.3 0.4
Other assets $ 18.9 $ 13.6