Segment Information (Net Sales Relating To Segments) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenue from External Customer [Line Items]
Net sales	$ 3,145.9	$ 3,009.5	$ 3,029.4
Hardware & Home Improvement [Member]
Revenue from External Customer [Line Items]
Net sales	1,377.7	1,276.1	1,241.0
Global Pet Supplies [Member]
Revenue from External Customer [Line Items]
Net sales	820.5	793.2	825.7
Home and Garden [Member]
Revenue from External Customer [Line Items]
Net sales	482.2	493.3	509.0
Global Auto Care [Member]
Revenue from External Customer [Line Items]
Net sales	$ 465.5	$ 446.9	$ 453.7

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration