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Goodwill and intangible assets - Schedule of Goodwill (Details) $ in Millions	9 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 244.2
Cumulative translation adjustment	0.9
Ending balance	1,062.4
Unallocated
Goodwill [Roll Forward]
Beginning balance	0.0
Cumulative translation adjustment	1.1
Ending balance	818.4
Americas
Goodwill [Roll Forward]
Beginning balance	228.4
Cumulative translation adjustment	0.0
Ending balance	228.4
International
Goodwill [Roll Forward]
Beginning balance	15.8
Cumulative translation adjustment	(0.2)
Ending balance	15.6
Spectrum Brands Holdings
Goodwill [Roll Forward]
Goodwill acquired	547.2
Spectrum Brands Holdings | Unallocated
Goodwill [Roll Forward]
Goodwill acquired	547.2
Spectrum Brands Holdings | Americas
Goodwill [Roll Forward]
Goodwill acquired	0.0
Spectrum Brands Holdings | International
Goodwill [Roll Forward]
Goodwill acquired	0.0
Spectrum Auto Care Acquisition
Goodwill [Roll Forward]
Goodwill acquired	270.1
Cumulative translation adjustment	0.4
Spectrum Auto Care Acquisition | Unallocated
Goodwill [Roll Forward]
Goodwill acquired	270.1
Spectrum Auto Care Acquisition | Americas
Goodwill [Roll Forward]
Goodwill acquired	0.0
Spectrum Auto Care Acquisition | International
Goodwill [Roll Forward]
Goodwill acquired	$ 0.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Topic 350
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- Definition

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