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Commitments and Contingencies (Details) AUD in Millions, $ in Millions |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 31, 2016 USD ($) | Jul. 10, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2016 USD ($) item | Sep. 30, 2006 AUD | Sep. 30, 2015 USD ($)
Standby Letters of Credit |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees |  |  |  | $ 487.5 |  | $ 436.5
Surety Bond |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |
Surety bonds issued |  |  |  | 2,900.0 |  | $ 2,300.0
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 |  |  |
AECOM Australia |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |
Proceeds from initial public offering (IPO) | AUD |  |  |  |  | AUD 700 |
Bank loan | AUD |  |  |  |  | AUD 1,400 |
Number of initial public offering investors | item |  |  |  | 770 |  |
Payments for legal settlements |  | $ 205.0 |  |  |  |
Damages claimed by applicants | $ 91.0 |  |  |  |  |

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