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Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Goodwill [Line Items] |  |
Indefinite-lived intangible assets | $ 1,292.4 | $ 76.9
Cumulative translation adjustment | 0.9 |
International |  |
Goodwill [Line Items] |  |
Cumulative translation adjustment | (0.2) |
Spectrum Brands Holdings |  |
Goodwill [Line Items] |  |
Increase in goodwill | 513.0 |
Spectrum Auto Care Acquisition |  |
Goodwill [Line Items] |  |
Increase in goodwill | 702.9 |
Cumulative translation adjustment | $ 0.4 |

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Details
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