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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Commitments [Line Items]      
Purchase Commitment for construction equipment $ 15.0    
Performance Guarantee [Member]      
Other Commitments [Line Items]      
Guarantor obligations, maximum exposure 614.9    
Guarantor Obligations Expected Costs 324.7    
Insurance Claims [Member]      
Other Commitments [Line Items]      
Insurance expense 30.4 $ 29.5 $ 25.6
Contingencies Excluding Wildfire and Health Insurance [Member]      
Other Commitments [Line Items]      
Loss Contingency Insurance Policy Deductible 1.0    
Wildfire [Member]      
Other Commitments [Line Items]      
Loss Contingency Insurance Policy Deductible 2.0    
Health Insurance [Member]      
Other Commitments [Line Items]      
Loss Contingency Insurance Policy Deductible $ 0.2