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Commitments and Contingencies (Legal, Letters of Credit, Bonds, Self-Insurance) (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Commitments and Contingencies [Line Items]    
Letters of credit issued $ 161.2 $ 115.1
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]    
Commitments and Contingencies [Line Items]    
Self-insurance reserve 125.3 123.4
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 85.8 87.3
Self-Insurance [Member] | Employee Group Medical Claims [Member]    
Commitments and Contingencies [Line Items]    
Self-insurance reserve 4.7 4.2
Performance and Payment Bonds [Member]    
Commitments and Contingencies [Line Items]    
Bonded projects, estimated costs to complete 162.8 194.7
Performance and Payment Bonds [Member] | Subsidiaries [Member]    
Commitments and Contingencies [Line Items]    
Outstanding bonds, amount 577.5 551.4
Financial Guarantees [Member] | Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]    
Commitments and Contingencies [Line Items]    
Letters of credit issued 64.0 64.0
Surety Bonds [Member] | Self-Insurance [Member] | Workers' Compensation [Member]    
Commitments and Contingencies [Line Items]    
Outstanding bonds, amount $ 38.5 $ 38.5