Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Components of Deferred Tax Assets and Liabilities [Abstract]
Pension	$ 38.7	$ 31.0
Operating lease liabilities	30.6
Postretirement benefits	19.6	18.6
Inventory	14.9	12.1
Other deferred tax assets	5.0	5.0
Payroll accruals	2.9	2.9
Bad debt reserves	1.0	1.0
Subtotal	112.7	70.6
less: valuation allowances	(0.4)
Deferred tax assets	112.3	70.6
Fixed assets	(32.2)	(28.3)
Operating lease right-of-use assets	(28.7)
Other deferred tax liabilities	(4.5)	(4.0)
Computer software	(2.9)	(3.2)
Deferred tax liabilities	(68.3)	(35.5)
Net deferred tax assets	44.0	35.1
Deferred Tax Assets, Net, Classification [Abstract]
Deferred tax assets, included in other non-current assets	44.5	35.5
Deferred tax liabilities included in other non-current liabilities	$ (0.5)	$ (0.4)