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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
Feb. 28, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
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
Advances outstanding, related party   $ 0.7   $ 0.5  
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   $ 0.3 $ 6.0    
Payables, related party   $ 1.4   $ 0.2