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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]      
Cost of merchandise sold $ 5,896.2 $ 6,094.9 $ 5,821.6
Outgoing freight expenses $ 68.8 $ 68.5 $ 65.7
Minimum      
Concentration Risk [Line Items]      
Amortization period 3 years    
Maximum      
Concentration Risk [Line Items]      
Amortization period 20 years    
Sales revenue | Services | Maximum      
Concentration Risk [Line Items]      
Concentration percentage 1.00%    
Freight Expenses As Selling, General And Administrative Expenses | Outgoing Freight Expenses      
Concentration Risk [Line Items]      
Concentration percentage 95.00%    
Prudential Private Placement Shelf Agreement      
Concentration Risk [Line Items]      
Agreement face amount $ 100.0