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Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 30, 2019
USD ($)
business_segments
Sep. 30, 2018
USD ($)
Sep. 30, 2017
Segment Reporting [Abstract]      
Number of Reportable Segments | business_segments 2    
Revenue, Major Customer [Line Items]      
Receivables, net $ 172.8 $ 164.3  
Intangible Assets, Net (Including Goodwill) 529.4 420.2  
Total assets $ 1,337.3 1,291.9  
Document Period End Date Sep. 30, 2019    
Mueller Co. [Member]      
Revenue, Major Customer [Line Items]      
Intangible Assets, Net (Including Goodwill) $ 508.2 396.9  
Total assets 1,107.8 843.9  
Mueller Technologies [Member]      
Revenue, Major Customer [Line Items]      
Intangible Assets, Net (Including Goodwill) 21.2 23.3  
Total assets $ 100.3 $ 87.1  
Customer Concentration Risk [Member] | Major Customers, Group One | Sales Revenue, Goods, Gross [Member]      
Revenue, Major Customer [Line Items]      
10 largest customers 53.00% 54.00% 53.00%
Customer Concentration Risk [Member] | Major Customers, Group Two | Sales Revenue, Goods, Gross [Member]      
Revenue, Major Customer [Line Items]      
10 largest customers 34.00% 34.00% 34.00%
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member]      
Revenue, Major Customer [Line Items]      
10 largest customers 18.00% 19.00% 18.00%
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] | Mueller Co. [Member]      
Revenue, Major Customer [Line Items]      
10 largest customers 17.00% 18.00% 17.00%
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] | Mueller Technologies [Member]      
Revenue, Major Customer [Line Items]      
10 largest customers 30.00% 28.00% 24.00%
Customer Concentration Risk [Member] | HDS IP Holdings, LLC [Member] | Sales Revenue, Goods, Gross [Member]      
Revenue, Major Customer [Line Items]      
10 largest customers 16.00% 15.00% 16.00%
Customer Concentration Risk [Member] | HDS IP Holdings, LLC [Member] | Sales Revenue, Goods, Gross [Member] | Mueller Co. [Member]      
Revenue, Major Customer [Line Items]      
10 largest customers 18.00% 17.00% 17.00%