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Restructuring and Other Charges - Schedule of Change in Restructuring Reserves (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Beginning balance			$ 10.0
Restructuring charges	$ 0.2	$ 10.2	3.1	$ 10.2
Utilized - cash			(10.7)
Utilized - noncash			(0.7)	(0.8)
Ending balance	1.7	9.4	1.7	9.4
Employee Severance and Termination Benefits
Restructuring Reserve [Roll Forward]
Beginning balance			9.7
Restructuring charges			0.3	9.4
Utilized - cash			(8.4)
Ending balance	1.6	$ 9.4	1.6	9.4
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
Utilized - cash			(2.3)
Utilized - noncash			1.6
Ending balance	$ 0.1		$ 0.1

X

- Definition

Restructuring reserve gain (loss) settled without cash.

+ References

No definition available.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585

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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section S99
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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

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