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Employee Benefit Plans (Multiemployer Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member]      
Multiemployer Plans [Line Items]      
EIN 136123601    
Pension Plan Number 001    
Pension Protections Act Zone Status Green Green  
FIP/RP Status Pending or Implemented No    
Company Contributions [1] $ 13.6 $ 11.8 $ 13.4
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement May 31, 2016    
Steamfitters Industry Pension Fund [Member]      
Multiemployer Plans [Line Items]      
EIN 136149680    
Pension Plan Number 001    
Pension Protections Act Zone Status Green Yellow  
FIP/RP Status Pending or Implemented No    
Company Contributions [1] $ 6.2 $ 5.1 4.3
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2017    
Excavators Union Local 731 Pension Fund [Member]      
Multiemployer Plans [Line Items]      
EIN 131809825    
Pension Plan Number 002    
Pension Protections Act Zone Status Green Green  
FIP/RP Status Pending or Implemented No    
Company Contributions $ 7.1 $ 5.3 3.2
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2016    
Local 147 Construction Workers Retirement Fund [Member]      
Multiemployer Plans [Line Items]      
EIN 136528181    
Pension Protections Act Zone Status Green Green  
FIP/RP Status Pending or Implemented No    
Company Contributions $ 5.6 [1] $ 1.3 0.2
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2018    
Iron Workers Locals 40,361 & 417 Pension Fund [Member]      
Multiemployer Plans [Line Items]      
EIN 516102576    
Pension Plan Number 001    
Pension Protections Act Zone Status Yellow Yellow  
FIP/RP Status Pending or Implemented Implemented    
Company Contributions $ 5.2 [1] $ 0.7 0.5
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2020    
New York City District Council of Carpenters Pension Plan [Member]      
Multiemployer Plans [Line Items]      
EIN 510174276    
Pension Plan Number 001    
Pension Protections Act Zone Status Green [2] Green  
FIP/RP Status Pending or Implemented No    
Company Contributions $ 3.1 $ 2.6 $ 1.6
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2016    
Multiemployer Pension Plans | Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member]      
Multiemployer Plans [Line Items]      
Exceeded percentage of total contributions 5.00% 5.00% 5.00%
Multiemployer Pension Plans | Steamfitters Industry Pension Fund [Member]      
Multiemployer Plans [Line Items]      
Exceeded percentage of total contributions 5.00% 5.00% 5.00%
Multiemployer Pension Plans | Local 147 Construction Workers Retirement Fund [Member]      
Multiemployer Plans [Line Items]      
Exceeded percentage of total contributions 5.00%    
Multiemployer Pension Plans | Iron Workers Locals 40,361 & 417 Pension Fund [Member]      
Multiemployer Plans [Line Items]      
Exceeded percentage of total contributions 5.00%    
[1] These amounts exceeded 5% of the respective total plan contributions.
[2] Pension Protection Act zone status is as of July 1, 2015 and 2014, respectively.