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Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 30, 2018
USD ($)
business_segments
customer
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Segment Reporting [Abstract]      
Number of Reportable Segments | business_segments 2    
Revenue, Major Customer [Line Items]      
Receivables, net $ 164.3 $ 145.3  
Intangible Assets, Net (Including Goodwill) 420.2 439.3  
Total assets $ 1,291.9 1,258.3  
Document Period End Date Sep. 30, 2018    
Mueller Co. [Member]      
Revenue, Major Customer [Line Items]      
Intangible Assets, Net (Including Goodwill) $ 396.9 417.2  
Total assets 843.9 792.6  
Mueller Technologies [Member]      
Revenue, Major Customer [Line Items]      
Intangible Assets, Net (Including Goodwill) 23.3 22.1  
Total assets $ 87.1 $ 88.4  
Customer Concentration Risk [Member] | Major Customers, Group One      
Revenue, Major Customer [Line Items]      
Number of major customers | customer 10    
Customer Concentration Risk [Member] | Major Customers, Group One | Sales Revenue, Net [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage of benchmark 54.00%    
Customer Concentration Risk [Member] | Major Customers, Group Two      
Revenue, Major Customer [Line Items]      
Number of major customers | customer 2    
Customer Concentration Risk [Member] | Major Customers, Group Two | Sales Revenue, Goods, Gross [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage of benchmark 34.00%    
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage of benchmark 19.00% 18.00% 17.00%
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] | Mueller Co. [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage of benchmark 18.00%    
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] | Mueller Technologies [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage of benchmark 28.00%    
Customer Concentration Risk [Member] | Ferguson Enterprises | Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Receivables, net $ 29.7 $ 20.0  
Customer Concentration Risk [Member] | HD Supply | Sales Revenue, Goods, Gross [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage of benchmark 15.00% 16.00% 16.00%
Customer Concentration Risk [Member] | HD Supply | Sales Revenue, Goods, Gross [Member] | Mueller Co. [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage of benchmark 17.00%    
Customer Concentration Risk [Member] | HD Supply | Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Receivables, net $ 31.7 $ 27.3