Inventories (Summary Of Inventory Not Accounted For Under LIFO) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
FIFO inventory	$ 8.7	$ 6.1
U.S. Locations [Member]
Segment Reporting Information [Line Items]
FIFO inventory	6.5	4.2
Canada Locations [Member]
Segment Reporting Information [Line Items]
FIFO inventory	$ 2.2	$ 1.9

The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766

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