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Segment Information (Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($) business_segments	Sep. 30, 2022 USD ($)	Sep. 30, 2021
Segment Reporting [Abstract]
Number of Reportable Segments | business_segments	2
Revenue, Major Customer [Line Items]
Receivables, net	$ 217.1	$ 228.0
Intangible Assets, Net (Including Goodwill)	427.7	459.8
Total assets	$ 1,505.0	1,498.1
Document Period End Date	Sep. 30, 2023
Mueller Co. [Member]
Revenue, Major Customer [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 283.8	302.6
Mueller Technologies [Member]
Revenue, Major Customer [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 143.9	$ 157.2
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member]
Revenue, Major Customer [Line Items]
10 largest customers	18.00%	20.00%	19.00%
Customer Concentration Risk [Member] | Core & Main, Inc. | Sales Revenue, Goods, Gross [Member]
Revenue, Major Customer [Line Items]
10 largest customers	18.00%	21.00%	18.00%

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