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Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 30, 2016
USD ($)
business_segments
customer
Sep. 30, 2015
USD ($)
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting [Abstract]        
Number of Reportable Segments | business_segments 3      
Revenue, Major Customer [Line Items]        
Receivables, net $ 186.7 $ 175.3    
Intangible Assets, Net (Including Goodwill) 486.0 507.3    
Total assets $ 1,280.6 1,229.8    
Document Period End Date Sep. 30, 2016      
Mueller Co. [Member]        
Revenue, Major Customer [Line Items]        
Intangible Assets, Net (Including Goodwill) $ 416.9 435.5    
Total assets 750.4 757.7    
Anvil [Member]        
Revenue, Major Customer [Line Items]        
Intangible Assets, Net (Including Goodwill) 51.4 54.5    
Total assets 243.5 255.3    
Mueller Technologies [Member]        
Revenue, Major Customer [Line Items]        
Intangible Assets, Net (Including Goodwill) 17.7 17.3    
Total assets $ 86.1 $ 77.2    
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 43.00%      
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 28.00%      
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 15.00% 13.00% 13.00%  
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] | Anvil [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 9.00%      
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] | Mueller Technologies [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 17.00%      
Customer Concentration Risk [Member] | Ferguson Enterprises | Accounts Receivable [Member]        
Revenue, Major Customer [Line Items]        
Receivables, net $ 30.7 $ 28.2    
Customer Concentration Risk [Member] | HD Supply | Sales Revenue, Goods, Gross [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 13.00% 12.00%   11.00%
Customer Concentration Risk [Member] | HD Supply | Sales Revenue, Goods, Gross [Member] | Mueller Co. [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 18.00%      
Customer Concentration Risk [Member] | HD Supply | Sales Revenue, Goods, Gross [Member] | Anvil [Member]        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage of benchmark 6.00%      
Customer Concentration Risk [Member] | HD Supply | Accounts Receivable [Member]        
Revenue, Major Customer [Line Items]        
Receivables, net $ 27.6 $ 17.4