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Other Retirement Plans (Schedule of Multi-Employer Pension Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Multi-Employer Plans [Line Items]      
Multi-employer plans, contributions (in dollars) $ 32.8 $ 36.4 $ 48.2
Multi-Employer Plans, Pension [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, contributions (in dollars) $ 23.8 31.9 44.6
Multi-Employer Plans, Pension [Member] | Central Pension Fund of the I.U.O.E and Participating Employers [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 366052390    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 5.7 $ 6.5 10.8
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date [1] Jan. 31, 2015 Jan. 31, 2014  
Multi-employer plans, extended amortization provisions true true  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Pipeline Industry Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 736146433    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 2.5 $ 4.8 9.8
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 02, 2017    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date [2] Dec. 31, 2014 Dec. 31, 2013  
Multi-employer plans, Company contributions greater than 5% of total plan contributions true true  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | International Union Of Operating Engineers Local One Hundred And Thirty Two Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 556015364    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 1.9 $ 0.0 0.4
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date Mar. 31, 2015 Mar. 31, 2014  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | West Virginia Laborers Pension Trust Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 556026775    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 1.4 $ 0.4 0.5
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date Mar. 31, 2015 Mar. 31, 2014  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | National Electrical Benefit Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 530181657    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 1.4 $ 1.3 1.1
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date Dec. 31, 2014 Dec. 31, 2013  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | National Electrical Benefit Fund [Member] | Maximum [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 02, 2018    
Multi-Employer Plans, Pension [Member] | Teamsters National Pipe Line Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 461102851    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 1.4 $ 1.7 2.7
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date [2] Dec. 31, 2014 Dec. 31, 2013  
Multi-employer plans, Company contributions greater than 5% of total plan contributions true true  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Michigan Laborers' Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 386233976    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 0.8 $ 2.1 4.3
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Yellow Yellow  
Multi-employer plans, pension protection act zone status, date Aug. 31, 2015 Aug. 31, 2014 [1],[2]  
Multi-employer plans, extended amortization provisions   true  
Multi-employer plans, Company contributions greater than 5% of total plan contributions   true  
Multi-employer plans, funding improvement plan and rehabilitation plan status Implemented    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Laborers' National Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 751280827    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 0.8 $ 0.8 1.1
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date Dec. 31, 2014 Dec. 31, 2013  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Laborers' District Council of Western Pennsylvania Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 256135576    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 0.5 $ 1.5 0.4
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Red Red  
Multi-employer plans, pension protection act zone status, date Dec. 31, 2014 Dec. 31, 2013  
Multi-employer plans, funding improvement plan and rehabilitation plan status Implemented    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | I.B.E.W. Local 769 Management Pension Plan A [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 866049763    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 0.3 $ 1.6 0.7
Multi-employer plans, collective bargaining arrangement, expiration date Jul. 30, 2016    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date Jun. 30, 2015 Jun. 30, 2014 [2]  
Multi-employer plans, Company contributions greater than 5% of total plan contributions   true  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Eighth District Electrical Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 846100393    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 0.2 $ 0.9 2.2
Multi-employer plans, collective bargaining arrangement, expiration date Feb. 28, 2018    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date Mar. 31, 2015 Mar. 31, 2014  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Operating Engineers' Construction Industry and Misc. Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 256135579    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 0.1 $ 1.2 0.1
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Green Green  
Multi-employer plans, pension protection act zone status, date [1] Dec. 31, 2014 Dec. 31, 2013  
Multi-employer plans, extended amortization provisions true true  
Multi-employer plans, funding improvement plan and rehabilitation plan status NA    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Operating Engineers' Local 324 Pension Fund [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, employer identification number 381900637    
Multi-employer plans, plan number 001    
Multi-employer plans, contributions (in dollars) $ 0.0 $ 1.7 4.5
Multi-employer plans, collective bargaining arrangement, expiration date Jun. 01, 2017    
Multi-employer plans, pension protection act zone status Red Red  
Multi-employer plans, pension protection act zone status, date Apr. 30, 2015 Apr. 30, 2014  
Multi-employer plans, funding improvement plan and rehabilitation plan status Implemented    
Multi-employer plans, surcharge status No    
Multi-Employer Plans, Pension [Member] | Other Funds [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, contributions (in dollars) $ 6.8 [3] $ 7.4 [3] $ 6.0
Multi-Employer Plans, Pension [Member] | Other Funds [Member] | Canadian Multi-Employer Plans [Member] | Canadian Dollars [Member]      
Multi-Employer Plans [Line Items]      
Multi-employer plans, contributions (in dollars) $ 1.4 $ 0.9  
[1] This plan has utilized extended amortization provisions, which provide plans with extensions of time to amortize pension funding shortfalls.
[2] The Company’s contributions to this plan represent greater than 5% of the plan’s total contributions.
[3] The 2015 and 2014 contributions include approximately $1.4 million and $0.9 million U.S. dollars, respectively, for Canadian multiemployer pension plans associated with the Company’s 2014 acquisition of Pacer, a Canadian company that employs union resources subject to collective bargaining agreements in connection with certain of its project work. Canadian multiemployer pension plans are not subject to the provisions of ERISA or the funding rules under the PPA that apply to U.S. registered multiemployer pension plans. Contributions to Canadian multiemployer pension plans are based on fixed amounts per hour per employee for employees covered under these plans.