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Income Taxes (Summary Of Temporary Differences That Give Rise To Deferred Income Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax assets (liabilities):    
Inventory costing and valuation methods $ 4.3 $ 4.2
Allowance for doubtful accounts 2.7 3.2
Insurance reserves 9.1 8.1
Customer promotions 1.9 1.9
Stock-based compensation 3.9 5.6
Operating lease liabilities 62.5 0.0
Federal and state benefit of uncertain tax positions 0.8 0.8
Foreign net operating loss and credit carryforwards 3.2 3.2
Foreign valuation allowances (2.8) (2.7)
Other, net 0.0 1.3
Total deferred income tax assets 85.6 25.6
Property and equipment (114.7) (104.7)
Operating lease ROU assets (61.7) 0.0
Total deferred income tax liabilities (176.4) (104.7)
Deferred income tax liabilities $ (90.8) $ (79.1)