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Commitments and Contingencies (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($)
Other Commitments [Line Items] |
Purchase orders outstanding | $ 5.5
Purchase orders outstanding, term | 5 months
Performance Guarantee [Member] |
Other Commitments [Line Items] |
Bonds outstanding | $ 1,079.0
Estimated remaining costs for bonded projects | 452.0
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

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