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Commitments and Contingencies (Legal, Letters of Credit, Bonds, Self-Insurance) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]      
Letters of credit issued   $ 115.1 $ 128.4
Self-Insurance [Member] | Other Long-Term Assets [Member]      
Loss Contingencies [Line Items]      
Cash collateral held by insurance carriers     1.6
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]      
Loss Contingencies [Line Items]      
Self-insurance reserve   123.4 108.9
Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member]      
Loss Contingencies [Line Items]      
Self-insurance reserve, non-current   87.3 70.8
Self-Insurance [Member] | Employee Group Medical Claims Policy [Member]      
Loss Contingencies [Line Items]      
Self-insurance reserve   4.2 2.9
Performance and Payment Bonds [Member]      
Loss Contingencies [Line Items]      
Bonded projects, estimated costs to complete   194.7 53.0
Performance and Payment Bonds [Member] | Subsidiaries [Member]      
Loss Contingencies [Line Items]      
Outstanding bonds, amount   551.4 123.6
Financial Guarantees [Member] | Self-Insurance [Member] | Workers' Compensation, General and Automobile Policies [Member]      
Loss Contingencies [Line Items]      
Letters of credit issued   64.0 67.6
Surety Bonds [Member] | Self-Insurance [Member] | Workers' Compensation [Member]      
Loss Contingencies [Line Items]      
Outstanding bonds, amount   $ 38.5 $ 34.8
Canadian Acquisition Arbitration [Member]      
Loss Contingencies [Line Items]      
Favorable arbitration award $ 60.0    
Collection of arbitration award 32.0    
Legal Fees [Member] | Canadian Acquisition Arbitration [Member]      
Loss Contingencies [Line Items]      
Collection of arbitration award 16.0    
Interest Expense [Member] | Canadian Acquisition Arbitration [Member]      
Loss Contingencies [Line Items]      
Collection of arbitration award $ 5.0