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Commitments and Contingencies (Details)
 9 Months Ended
Sep. 30, 2021
USD ($)
Other Commitments [Line Items]  
Purchase orders outstanding $ 11,200,000
Purchase orders outstanding, term 8 months
Performance Guarantee  
Other Commitments [Line Items]  
Bonds outstanding $ 1,280,000,000
Estimated remaining costs for bonded projects 531,500,000
Contingencies Excluding Wildfire and Health Insurance  
Other Commitments [Line Items]  
Insurance coverage deductible 1,000,000
Wildfire  
Other Commitments [Line Items]  
Insurance coverage deductible 2,000,000
Contingency Umbrella Exposure Limit  
Other Commitments [Line Items]  
Umbrella exposure limit 3,800,000
Health Insurance  
Other Commitments [Line Items]  
Insurance coverage deductible $ 200,000