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Commitments and Contingencies (Legal, Letters of Credit, Bonds, Self-Insurance) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Commitments and Contingencies [Line Items]        
Letters of credit issued     $ 142.4 $ 128.4
Self-Insurance [Member] | Other Long-Term Assets [Member] | Cash [Member]        
Commitments and Contingencies [Line Items]        
Cash collateral held by insurance carriers     1.6 1.6
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]        
Commitments and Contingencies [Line Items]        
Self-insurance reserve     119.7 108.9
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member]        
Commitments and Contingencies [Line Items]        
Self-insurance reserve, non-current     78.5 70.8
Self-Insurance [Member] | Employee Group Medical Claims [Member]        
Commitments and Contingencies [Line Items]        
Self-insurance reserve     4.8 2.9
Performance and Payment Bonds [Member]        
Commitments and Contingencies [Line Items]        
Bonded projects, estimated costs to complete     178.0 53.0
Performance and Payment Bonds [Member] | Subsidiaries [Member]        
Commitments and Contingencies [Line Items]        
Outstanding bonds, amount     430.3 123.6
Financial Guarantees [Member] | Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]        
Commitments and Contingencies [Line Items]        
Letters of credit issued     67.6 67.6
Surety Bonds [Member] | Self-Insurance [Member]        
Commitments and Contingencies [Line Items]        
Outstanding bonds, amount     $ 38.5 $ 34.8
Canadian Acquisition Arbitration [Member]        
Commitments and Contingencies [Line Items]        
Favorable arbitration award $ 60.0      
Collections of arbitration award 32.0      
Canadian Acquisition Arbitration [Member] | Legal Fees [Member]        
Commitments and Contingencies [Line Items]        
Collections of arbitration award   $ 16.0    
Canadian Acquisition Arbitration [Member] | Interest Costs [Member]        
Commitments and Contingencies [Line Items]        
Collections of arbitration award $ 5.0