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Commitments and Contingencies - Other and Bonds (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
item
Obligation to perform subcontract work | Pending Litigation  
Commitments and Contingencies  
Letter of intent under dispute | item 2
Damages claimed $ 9
Obligation to perform subcontract work | Customer | Pending Litigation  
Commitments and Contingencies  
Damages claimed $ 15
Surety | Minimum  
Surety  
Percentage of business which has required bonds 15.00%
Surety | Maximum  
Surety  
Percentage of business which has required bonds 25.00%