Inventories (Summary Of Inventory Not Accounted For Under LIFO) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
FIFO inventory	$ 39.3	$ 46.3
U.S. Locations [Member]
Segment Reporting Information [Line Items]
FIFO inventory	35.3	43.2
Canada Locations [Member]
Segment Reporting Information [Line Items]
FIFO inventory	$ 4.0	$ 3.1

The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483489/210-10-50-1

Name:	us-gaap_WeightedAverageCostInventoryAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant