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Restructuring and Other Charges - Schedule of Change in Restructuring Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Beginning balance	$ 10.0
Restructuring charges	2.8	$ 14.4
Utilized - cash	(11.6)	(3.5)
Utilized - noncash	(0.7)	(0.8)
Foreign currency translation		(0.1)
Ending balance	0.5	10.0
Employee Severance and Termination Benefits
Restructuring Reserve [Roll Forward]
Beginning balance	9.7
Restructuring charges		13.3
Utilized - cash	(9.3)	(3.5)
Foreign currency translation		(0.1)
Ending balance	0.4	9.7
Property, Plant and Equipment Impairment
Restructuring Reserve [Roll Forward]
Restructuring charges	2.3	0.8
Utilized - noncash	(2.3)	(0.8)
Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.3
Restructuring charges	0.5	0.3
Utilized - cash	(2.3)
Utilized - noncash	1.6
Ending balance	$ 0.1	$ 0.3

X

- Definition

Restructuring reserve gain (loss) settled without cash.

+ References

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB
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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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