Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Commitments and Contingencies    
Environmental expenses $ 0.3 $ 1.0
Insurance proceeds receivable 2.1 2.1
Purchase Commitments    
Commitments and Contingencies    
Purchase obligations and commitments 36.3 36.3
Surface Use and Compensation    
Timing of future payments    
Remaining 2022 3.2 3.2
2023 9.0 9.0
2024 9.8 9.8
2025 10.6 10.6
2026 11.3 11.3
Thereafter 4.5 4.5
Fixed price power purchase contract    
Commitments and Contingencies    
Commitment obligations $ 7.9 $ 7.9