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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, 2017
Dec. 31, 2016
Deferred income tax assets (liabilities):    
Inventory costing and valuation methods $ 3.6 $ 4.8
Allowance for doubtful accounts 3.0 4.3
Insurance reserves 8.4 11.5
Promotions payable 1.3 1.7
Stock-based compensation 5.2 6.8
Federal and state benefit of uncertain tax positions 0.9 1.9
Foreign net operating loss and credit carryforwards 4.2 5.1
Foreign valuation allowances (2.8) (4.0)
Other, net 0.8 2.1
Total deferred income tax assets 24.6 34.2
Property and equipment (75.2) (114.8)
Total deferred income tax liabilities (75.2) (114.8)
Deferred income tax liabilities $ (50.6) $ (80.6)