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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, 2021	Sep. 30, 2020
Goodwill [Roll Forward]
Balance at beginning of period	$ 627.2	$ 626.0
Allocated to Coevorden Operations divestiture		(10.6)
Foreign currency impact	2.3	3.2
Balance at end of period	867.2	627.2
Omega Sea acquisition
Goodwill [Roll Forward]
Acquisitions		8.6
Rejuvenate acquisition
Goodwill [Roll Forward]
Acquisitions	147.0
Armitage acquisition
Goodwill [Roll Forward]
Acquisitions	90.7
GPC
Goodwill [Roll Forward]
Balance at beginning of period	431.6	430.4
Allocated to Coevorden Operations divestiture		(10.6)
Foreign currency impact	2.3	3.2
Balance at end of period	524.6	431.6
GPC | Omega Sea acquisition
Goodwill [Roll Forward]
Acquisitions		8.6
GPC | Rejuvenate acquisition
Goodwill [Roll Forward]
Acquisitions	0.0
GPC | Armitage acquisition
Goodwill [Roll Forward]
Acquisitions	90.7
H&G
Goodwill [Roll Forward]
Balance at beginning of period	195.6	195.6
Allocated to Coevorden Operations divestiture		0.0
Foreign currency impact	0.0	0.0
Balance at end of period	342.6	195.6
H&G | Omega Sea acquisition
Goodwill [Roll Forward]
Acquisitions		$ 0.0
H&G | Rejuvenate acquisition
Goodwill [Roll Forward]
Acquisitions	147.0
H&G | Armitage acquisition
Goodwill [Roll Forward]
Acquisitions	$ 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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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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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X

- 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

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+ References

No definition available.

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- Definition

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.

+ References

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