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EMPLOYEE BENEFIT PLANS - Summary of Projected Benefit Obligations, Accumulated Benefit Obligations, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 71.4	$ 76.1
Accumulated benefit obligation	71.4	76.1
Fair value of plan assets	69.6	64.6
Non U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	106.2	86.8
Accumulated benefit obligation	100.6	81.3
Fair value of plan assets	$ 65.1	$ 45.5

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Amount of accumulated benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920

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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920

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