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Organization Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 2.2	$ 0.6	$ 2.2	$ 0.6	$ 2.8	$ 1.7
Restructuring and other charges	$ 0.8	$ 0.9	2.2	3.3
Payments			(1.6)	(2.7)
Mueller One Project [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges			$ 1.0	$ 1.6

X

- 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
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 230
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-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

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+ References

No definition available.

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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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-Publisher FASB
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