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Commitments and Contingencies (Other Commitments and Contingencies) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Mar. 31, 2016
Nov. 30, 2011
Central States Southeast And Southwest Areas Pension Fund [Member] | Multiemployer Plans, Pension [Member]        
Commitments and Contingencies [Line Items]        
Multiemployer plans, withdrawal obligation   $ 3.0   $ 6.4
Multiemployer plans, withdrawal obligation, payments     $ 3.0  
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member]        
Commitments and Contingencies [Line Items]        
Self insurance reserve $ 76.3 76.1    
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member]        
Commitments and Contingencies [Line Items]        
Self insurance reserve, non-current 47.5 47.5    
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Assets [Member] | Cash [Member]        
Commitments and Contingencies [Line Items]        
Cash collateral deposited with insurance carriers 1.5 1.3    
Uninsured Risk [Member] | Employee Group Medical Claims Policies [Member]        
Commitments and Contingencies [Line Items]        
Self insurance reserve $ 2.5 1.6    
Joint Venture That Provides Infrastructure Construction Services [Member]        
Commitments and Contingencies [Line Items]        
Proportionately consolidated non-controlled joint venture, ownership percentage 90.00%      
Pacer [Member]        
Commitments and Contingencies [Line Items]        
Proportionately consolidated non-controlled joint venture, ownership percentage 35.00%      
Performance and Payment Bonds [Member]        
Commitments and Contingencies [Line Items]        
Outstanding bonds, amount $ 141.5 539.3    
Performance and Payment Bonds [Member] | Estimate [Member]        
Commitments and Contingencies [Line Items]        
Bonded projects, costs to complete 15.0 36.0    
Surety Bond [Member] | Uninsured Risk [Member] | Workers Compensation [Member]        
Commitments and Contingencies [Line Items]        
Outstanding bonds, amount 13.0 13.4    
Credit Facility [Member]        
Commitments and Contingencies [Line Items]        
Letters of credit issued 337.8 292.8    
Credit Facility [Member] | Financial Guarantees [Member] | Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member]        
Commitments and Contingencies [Line Items]        
Letters of credit issued $ 80.4 $ 83.2