Allowances For Cash Discounts And Credit Losses (Schedule of Cash Discounts and Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 6.9	$ 6.2	$ 5.9
Provision (Charged to Expense)	46.2	37.7	42.8
Deductions	(44.0)	(37.0)	(42.5)
Ending Balance	9.1	6.9	6.2
Allowance for cash discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	2.9	2.2	2.2
Provision (Charged to Expense)	44.3	35.1	35.8
Deductions	(43.4)	(34.4)	(35.8)
Ending Balance	3.8	2.9	2.2
Allowance for credit losses
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	4.0	4.0	3.7
Provision (Charged to Expense)	1.9	2.6	7.0
Deductions	(0.6)	(2.6)	(6.7)
Ending Balance	$ 5.3	$ 4.0	$ 4.0