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Related Party Transactions (Construction Management Firm and CCI) (Narrative) (Details) - Immediate Family Member of Management [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 10 Months Ended
Feb. 28, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Construction Management Firm Specializing in Steel Building Systems [Member]            
Related Party Transaction [Line Items]            
Business combinations, cash paid $ 6.1          
Business combinations, contingent consideration, earn-out liabilities   $ 1.4   $ 1.4    
Business combinations, notes payable assumed 2.6          
Business combinations, interest accrued on notes payable assumed $ 0.1          
Repayments of notes payable and interest accrued           $ 2.7
Advances outstanding, related party   $ 0.4   $ 0.4   1.0
CCI [Member]            
Related Party Transaction [Line Items]            
Equity investment, ownership percentage   15.00%   15.00%    
CCI [Member] | Equipment [Member]            
Related Party Transaction [Line Items]            
Payments, net of rebates, related party   $ 7.7 $ 9.0 $ 23.6 $ 19.9  
Payables, related party   $ 12.3   $ 12.3   4.9
Rebates receivable, related party           $ 2.9