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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Concentration Risk [Line Items]      
Cost of merchandise sold $ 1,432.8 $ 1,439.1  
Operating lease right-of-use assets $ 125.0   $ 117.5
Minimum      
Concentration Risk [Line Items]      
Amortization period 3 years    
Maximum      
Concentration Risk [Line Items]      
Amortization period 20 years    
Sales revenue | Professional Services, General Contracting Services, And Storage Services | Maximum      
Concentration Risk [Line Items]      
Concentration percentage 1.00%    
Freight Expenses As Selling, General And Administrative Expenses      
Concentration Risk [Line Items]      
Concentration percentage 95.00%    
Inventories Using LIFO Method      
Concentration Risk [Line Items]      
Concentration percentage 91.00% 91.00%