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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 12 Months Ended
Feb. 28, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Construction Management Firm Specializing in Steel Building Systems [Member]        
Related Party Transaction [Line Items]        
Business combinations, cash paid $ 6.1      
Contingent consideration, earn-out liability     $ 1.4  
Financing or amounts advanced, related party   $ 0.5 1.0  
CCI [Member]        
Related Party Transaction [Line Items]        
Equity investment, ownership percentage   15.00%    
CCI [Member] | Equipment [Member]        
Related Party Transaction [Line Items]        
Payments, net of rebates, related party   $ 41.7 57.6 $ 54.9
Payables, related party   $ 0.2 4.9  
Rebates Receivables, Related Parties     $ 2.9