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Commitments and Contingencies (Other Commitments and Contingencies) (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Commitments and Contingencies [Line Items]    
Letters of credit issued $ 106.1 $ 157.1
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]    
Commitments and Contingencies [Line Items]    
Self-insurance reserve 101.2 106.2
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 64.3 72.2
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [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] | Employee Group Medical Claims Policies [Member]    
Commitments and Contingencies [Line Items]    
Self-insurance reserve 2.8 2.6
Performance and Payment Bonds [Member]    
Commitments and Contingencies [Line Items]    
Bonded projects, estimated costs to complete 48.9 46.0
Performance and Payment Bonds [Member] | Subsidiaries [Member]    
Commitments and Contingencies [Line Items]    
Outstanding bonds, amount 112.5 119.7
Financial Guarantees [Member] | Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]    
Commitments and Contingencies [Line Items]    
Letters of credit issued 67.6 88.9
Surety Bond [Member] | Self-Insurance [Member] | Workers' Compensation [Member]    
Commitments and Contingencies [Line Items]    
Outstanding bonds, amount $ 35.9 $ 15.2