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Segment Information (Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2022 USD ($) business_segments	Sep. 30, 2021 USD ($)	Sep. 30, 2020
Segment Reporting [Abstract]
Number of Reportable Segments | business_segments	2
Revenue, Major Customer [Line Items]
Receivables, net	$ 228.0	$ 212.2
Intangible Assets, Net (Including Goodwill)	459.8	507.6
Total assets	$ 1,498.1	1,518.0
Document Period End Date	Sep. 30, 2022
Mueller Co. [Member]
Revenue, Major Customer [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 302.6	324.1
Mueller Technologies [Member]
Revenue, Major Customer [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 157.2	$ 183.5
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member]
Revenue, Major Customer [Line Items]
10 largest customers	20.00%	19.00%	17.00%

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