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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Commitments [Line Items]      
Purchase orders outstanding $ 9.5    
Purchase orders outstanding, term 9 months    
Insurance expense $ 56.4 $ 48.5 $ 30.4
Performance Guarantee      
Other Commitments [Line Items]      
Bonds outstanding 1,330.0    
Estimated remaining costs for bonded projects 629.1    
Contingencies Excluding Wildfire and Health Insurance      
Other Commitments [Line Items]      
Insurance coverage deductible 1.0    
Wildfire      
Other Commitments [Line Items]      
Insurance coverage deductible 2.0    
Health Insurance      
Other Commitments [Line Items]      
Insurance coverage deductible $ 0.2