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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 1,111.0 $ 964.1 $ 968.0
Intangible Assets, Net (Including Goodwill) 507.6 508.7  
Total assets $ 1,518.0 1,395.0  
Document Period End Date Sep. 30, 2021    
Property, plant and equipment, net $ 283.4 253.8  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 263.9 234.7  
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 13.8 12.8  
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 5.7 6.3  
Mueller Co. [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 1,022.0 883.6 871.0
Intangible Assets, Net (Including Goodwill) 473.2 490.8  
Mueller Co. [Member] | Central Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 259.5 221.7 214.2
Mueller Co. [Member] | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 910.7 787.0 772.8
Mueller Co. [Member] | Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 81.4 65.5 69.0
Mueller Co. [Member] | Northeast Region [Member] [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 195.5 187.0 183.1
Mueller Co. [Member] | Southeast Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 201.0 161.9 162.7
Mueller Co. [Member] | Western Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 254.7 216.4 212.8
Mueller Co. [Member] | Other International Locations [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 29.9 31.1 29.2
Mueller Technologies [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 89.0 80.5 97.0
Intangible Assets, Net (Including Goodwill) 34.4 17.9  
Mueller Technologies [Member] | Central Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 21.2 19.2 27.8
Mueller Technologies [Member] | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 84.3 76.0 92.0
Mueller Technologies [Member] | Northeast Region [Member] [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 15.1 20.2 20.4
Mueller Technologies [Member] | Southeast Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 31.2 22.7 33.5
Mueller Technologies [Member] | Western Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 16.8 13.9 10.3
Mueller Technologies [Member] | Other International Locations [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 4.7 4.5 5.0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Ferguson Enterprises      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Accounts and Other Receivables, Net, Current 32.1 $ 26.1  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | HDS IP Holdings, LLC [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Accounts and Other Receivables, Net, Current $ 48.1   $ 37.1
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Major Customers, Group One      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 58.00% 53.00% 53.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Major Customers, Group Two      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 37.00% 34.00% 34.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 19.00% 17.00% 18.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises | Mueller Co. [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 18.00% 16.00% 17.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises | Mueller Technologies [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 33.00% 22.00% 30.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | HDS IP Holdings, LLC [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 18.00% 17.00% 16.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | HDS IP Holdings, LLC [Member] | Mueller Co. [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 20.00% 19.00% 18.00%