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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Intangible Assets [Line Items] |  |  |
Impairment of goodwill | $ 0.0 | $ 116.0 | $ 0.0
Impairment of indefinite lived intangible assets | 24.2 | 35.4 | 20.3
Impairment loss recognized on definite-lived tangible assets | 7.6 |  |
Amortization expense | 68.0 | 83.4 | $ 53.0
Coevorden Operations |  |  |
Intangible Assets [Line Items] |  |  |
Impairment loss recognized on definite-lived tangible assets | $ 7.6 |  |
HHI |  |  |
Intangible Assets [Line Items] |  |  |
Percentage of reporting units exceeded carrying values by | 32.00% |  |
Impairment of goodwill |  | 0.0 |
GPC |  |  |
Intangible Assets [Line Items] |  |  |
Percentage of reporting units exceeded carrying values by | 52.00% |  |
Impairment of goodwill |  | 0.0 |
H&G |  |  |
Intangible Assets [Line Items] |  |  |
Percentage of reporting units exceeded carrying values by | 134.00% |  |
Impairment of goodwill |  | 0.0 |
HHI, GPC, and H&G |  |  |
Intangible Assets [Line Items] |  |  |
Impairment of goodwill | $ 0.0 |  |
HPC |  |  |
Intangible Assets [Line Items] |  |  |
Impairment of goodwill |  | 116.0 |
Amortization expense | 15.5 |  |
Tradenames |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 1,007.5 | 1,011.1 |
Tradenames | Coevorden Operations |  |  |
Intangible Assets [Line Items] |  |  |
Impairment of indefinite lived intangible assets | 16.6 |  |
Indefinite-lived intangible assets | $ 136.9 |  |
Tradenames | HPC |  |  |
Intangible Assets [Line Items] |  |  |
Impairment of indefinite lived intangible assets |  | 18.8 |
Tradenames | GPC |  |  |
Intangible Assets [Line Items] |  |  |
Impairment of indefinite lived intangible assets |  | $ 16.6 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of loss from the write-down of an asset representing the 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 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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