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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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Goodwill And Intangible Assets Percentage Of Reporting Units Exceeded Carrying Values

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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.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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