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Commitments and Contingencies - Additional information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Commitments [Line Items]      
Purchase orders outstanding $ 5.4    
Purchase orders outstanding, term 3 months    
Performance Guarantee [Member]      
Other Commitments [Line Items]      
Bonds outstanding $ 902.0    
Estimated remaining costs for bonded projects 399.2    
Insurance Claims [Member]      
Other Commitments [Line Items]      
Insurance expense 48.5 $ 30.4 $ 29.5
Contingencies Excluding Wildfire and Health Insurance [Member]      
Other Commitments [Line Items]      
Insurance coverage deductible 1.0    
Wildfire [Member]      
Other Commitments [Line Items]      
Insurance coverage deductible 2.0    
Health Insurance [Member]      
Other Commitments [Line Items]      
Insurance coverage deductible $ 0.2