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Goodwill and Other Intangible Assets (2018 Acquisitions) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jun. 30, 2019
Business Combinations [Line Items]    
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high (in dollars)   $ 217.0
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 (in dollars) $ 6.8  
Business combinations, contingent consideration, earn-out liabilities   $ 1.5
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high (in dollars)   $ 6.0