Income Taxes (Summary Of Temporary Differences That Give Rise To Deferred Income Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets (liabilities):
Inventory costing and valuation methods	$ 5.2	$ 5.3
Allowance for credit losses	3.1	3.1
Insurance reserves	7.4	9.1
Customer promotions	2.3	2.4
Stock-based compensation	2.8	3.3
Operating lease liabilities	62.6	62.1
Federal and state benefit of uncertain tax positions	0.9	0.8
Foreign net operating loss and credit carryforwards	1.4	1.9
Foreign valuation allowances	(1.7)	(2.2)
Prepaid royalty	5.9	0.0
Other, net	0.2	(0.3)
Total deferred income tax assets	90.1	85.5
Property and equipment	(110.0)	(117.6)
Operating lease ROU assets	(61.3)	(61.4)
Total deferred income tax liabilities	(171.3)	(179.0)
Deferred income tax liabilities	$ (81.2)	$ (93.5)