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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill by Reporting Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Goodwill [Roll Forward]
Goodwill, beginning	$ 1,328.1	$ 1,454.7
Foreign currency impact	5.9	(9.7)
Impairment	0.0	(116.0)	$ 0.0
Deferred tax impact		0.9
Omega Sea acquisition	8.6
Allocated to Assets Held for Sale-Coevorden Operations	(10.6)
Goodwill, ending	1,332.0	1,328.1	1,454.7
HHI
Goodwill [Roll Forward]
Goodwill, beginning	702.1	704.3
Foreign currency impact	2.7	(2.2)
Impairment		0.0
Deferred tax impact		0.0
Omega Sea acquisition	0.0
Allocated to Assets Held for Sale-Coevorden Operations	0.0
Goodwill, ending	704.8	702.1	704.3
GPC
Goodwill [Roll Forward]
Goodwill, beginning	430.4	435.9
Foreign currency impact	3.2	(5.5)
Impairment		0.0
Deferred tax impact		0.0
Omega Sea acquisition	8.6
Allocated to Assets Held for Sale-Coevorden Operations	(10.6)
Goodwill, ending	431.6	430.4	435.9
H&G
Goodwill [Roll Forward]
Goodwill, beginning	195.6	196.5
Foreign currency impact	0.0	0.0
Impairment		0.0
Deferred tax impact		0.9
Omega Sea acquisition	0.0
Allocated to Assets Held for Sale-Coevorden Operations	0.0
Goodwill, ending	195.6	195.6	196.5
HPC
Goodwill [Roll Forward]
Goodwill, beginning	0.0	118.0
Foreign currency impact	0.0	(2.0)
Impairment		(116.0)
Deferred tax impact		0.0
Omega Sea acquisition	0.0
Allocated to Assets Held for Sale-Coevorden Operations	0.0
Goodwill, ending	$ 0.0	$ 0.0	$ 118.0

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

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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

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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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- 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.

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Amount of (increase) decrease to an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from the subsequent recognition of deferred tax assets.

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Amount of transfers into (out 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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