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Employee Benefit Plans, Multiemployer Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Multiemployer Pension Plans [Member]
     
Multiemployer Plans [Abstract]      
Company Contributions $ 29.9 $ 29.8 $ 18.7
Multiemployer Pension Plans [Member] | Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member]
     
Multiemployer Plans [Abstract]      
Minimum percentage of plan funded (in hundredths) 80.00%    
EIN 136123601    
Pension Plan Number 001    
Pension Protections Act Zone Status Green Green  
FIP/RP Status Pending or Implemented No    
Company Contributions 12.9 [1] 6.3 [2] 0
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement May 08, 2013    
Multiemployer Pension Plans [Member] | Steamfitters Industry Pension Fund [Member]
     
Multiemployer Plans [Abstract]      
Maximum percentage of plan funded (in hundredths) 80.00%    
EIN 136149680    
Pension Plan Number 001    
Pension Protections Act Zone Status Yellow Yellow  
FIP/RP Status Pending or Implemented Implemented    
Company Contributions 3.5 [1] 3.5 [2] 0
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2014    
Multiemployer Pension Plans [Member] | Excavators Union Local 731 Pension Fund [Member]
     
Multiemployer Plans [Abstract]      
Minimum percentage of plan funded (in hundredths) 80.00%    
EIN 131809825    
Pension Plan Number 002    
Pension Protections Act Zone Status Green Green  
FIP/RP Status Pending or Implemented No    
Company Contributions 3.3 2.9 2.8
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2016    
Multiemployer Pension Plans [Member] | Carpenters Pension Trust Fund for Northern California [Member]
     
Multiemployer Plans [Abstract]      
Maximum percentage of plan funded (in hundredths) 65.00%    
EIN 946050970    
Pension Plan Number 001    
Pension Protections Act Zone Status Red Red  
FIP/RP Status Pending or Implemented Implemented    
Company Contributions $ 2.3 $ 1.4 $ 1.7
Surcharge Imposed No    
Expiration Date of Collective Bargaining Arrangement Jun. 30, 2015    
[1] These amounts exceeded 5% of the respective total plan contributions.
[2] Amounts pertaining to plans from one of the Company's newly acquired entities during 2011, and as such, there were no contributions made in 2010.