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Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 30, 2017
USD ($)
business_segments
customer
Sep. 30, 2016
USD ($)
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting [Abstract]        
Number of Reportable Segments | business_segments 2      
Revenue, Major Customer [Line Items]        
Receivables, net $ 145.3 $ 131.8    
Intangible Assets, Net (Including Goodwill) 439.3 434.6    
Total assets $ 1,258.3 1,280.6    
Document Period End Date Sep. 30, 2017      
Mueller Co. [Member]        
Revenue, Major Customer [Line Items]        
Intangible Assets, Net (Including Goodwill) $ 417.2 416.9    
Total assets 792.6 750.4    
Mueller Technologies [Member]        
Revenue, Major Customer [Line Items]        
Intangible Assets, Net (Including Goodwill) 22.1 17.7    
Total assets $ 88.4 $ 86.1    
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, Goods, Gross [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 53.00%      
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 18.00% 17.00% 15.00%  
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] | Mueller Co. [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 17.00%      
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] | Mueller Technologies [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 24.00%      
Customer Concentration Risk [Member] | Ferguson Enterprises | Accounts Receivable [Member]        
Revenue, Major Customer [Line Items]        
Receivables, net $ 20.0 $ 21.9    
Customer Concentration Risk [Member] | HD Supply | Sales Revenue, Goods, Gross [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 16.00% 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 $ 27.3 $ 23.8