Inventories (Narrative) (Details) - USD ($) $ in Millions	Jul. 02, 2017	Jan. 01, 2017
Inventory Disclosure [Abstract]
Inventories at average cost or FIFO methods	$ 371.5	$ 268.4
Inventories at cost as per LIFO	$ 83.4	$ 68.4

The amount of LIFO (last 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_LIFOInventoryAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant