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Commitments and Contingencies (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 23, 2017 USD ($) | Nov. 22, 2016 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) item | Sep. 30, 2016 USD ($)
Commitments and Contingencies |  |  |  |  |
Number of affiliates for which inspections occurred on accounts and records by World Bank | item |  |  |  | 2 |
DOE Hanford Nuclear Reservation |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Payments for legal settlements |  | $ 57.5 |  |  |
Net benefit of settlement |  | $ 35.0 |  |  |
DOE Hanford Nuclear Reservation | Subsequent Event |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Payments for legal settlements | $ 5.3 |  |  |  |
Standby Letters of Credit |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees |  |  |  | $ 464.9 | $ 474.5
Surety Bond |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Surety bonds issued |  |  |  | 3,600.0 | $ 3,300.0
DOE Deactivation Demolition And Removal Project | URS Corporation | Washington Group International |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Projects costs, maximum |  |  |  | 146.0 |
DOE Deactivation Demolition And Removal Project | Department of Energy |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Projects costs, minimum |  |  |  | 106.0 |
DOE Deactivation Demolition And Removal Project | Department of Energy | URS Corporation | Washington Group International |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Projects costs, minimum |  |  |  | 106.0 |
Projects costs, maximum |  |  |  | $ 146.0 |
Amount recovery (including additional Fees) |  |  | $ 103.0 |  |
Minimum cost to complete the project and promised amenities |  |  | $ 100.0 |  |

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