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Goodwill and Other Intangible Assets (2018 Acquisitions) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Sep. 30, 2019
Business Combinations [Line Items]    
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high   $ 225.0
Construction Management Firm Specializing in Steel Building Systems [Member]    
Business Combinations [Line Items]    
Business combinations, percentage of interests acquired 100.00%  
2018 Acquisitions [Member]    
Business Combinations [Line Items]    
Business combinations, cash paid $ 5.1  
Business combinations, contingent consideration, earn-out liabilities   1.5
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high   $ 5.0