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Commitments and Contingencies (Details)
CAD in Millions, AUD in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 22, 2016
USD ($)
Jan. 05, 2016
USD ($)
Dec. 10, 2015
USD ($)
Jul. 10, 2015
USD ($)
Dec. 06, 2014
USD ($)
Oct. 17, 2014
USD ($)
project
item
Jun. 17, 2014
AUD
Aug. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jan. 31, 2010
CAD
Dec. 31, 2015
USD ($)
employee
item
Sep. 30, 2006
AUD
Commitments and Contingencies                        
Favorable contingencies                     $ 19.7  
Favorable settlements associated with environmental claims                     $ 15.4  
Securities acquired by investors | AUD             AUD 155          
Washington Group International                        
Commitments and Contingencies                        
Civil penalty Amount   $ 9.0                    
URS Energy & Construction                        
Commitments and Contingencies                        
Damages claimed by applicants               $ 4.1        
Number of former employees who filed claims against our affiliate | employee                     2  
Standby Letters of Credit                        
Commitments and Contingencies                        
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees                     $ 461.2  
USAID Egyptian Projects | URS Corporation | Washington Group International                        
Commitments and Contingencies                        
Number of subcontractors | item           2            
Number of projects failed to comply USAID regulations | project           5            
Amount paid to WGI from the federal government for completed and operational projects ( including doubling and trebling of damages)           $ 373.0            
DOE Deactivation Demolition And Removal Project | URS Corporation | Washington Group International                        
Commitments and Contingencies                        
Projects costs, minimum                     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      
Canadian Pipeline Contract | URS Corporation | Flint Energy Services Ltd                        
Commitments and Contingencies                        
Damages claimed by applicants | CAD                   CAD 45    
Waste Isolation Pilot Plant Environmental Incidents | Nuclear Waste Partnership LLC                        
Commitments and Contingencies                        
Civil penalty Amount         $ 17.7              
Favorable contingencies $ 13.2                      
Favorable settlements associated with environmental claims $ 10.1                      
Tishman Inquiry | Tishman Construction Corporation (TCC)                        
Commitments and Contingencies                        
Proceeds from Legal Settlements     $ 5.6                  
Payments for Legal Settlements     $ 14.6                  
Legal Settlements Payment Period     2 years                  
AECOM Australia                        
Commitments and Contingencies                        
Payments for Legal Settlements       $ 205.0                
Proceeds from initial public offering (IPO) | AUD                       AUD 700
Bank loan | AUD                       AUD 1,400
Number of initial public offering investors | item                     770