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Commitments and Contingencies (Details) | Dec. 31, 2020 USD ($)
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Guarantee Obligations [Line Items] |
Additional bonding capacity | $ 565,000,000.0
Facility Agreement | Powell (UK) Limited |
Guarantee Obligations [Line Items] |
Guarantee liability | 7,600,000
Revolving credit facility | 9,600,000
Amount of credit facility remaining borrowing capacity | 2,000,000.0
Surety Bonds |
Guarantee Obligations [Line Items] |
Guarantee liability | $ 185,000,000.0

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