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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 1,247.4 $ 1,111.0 $ 964.1
Intangible Assets, Net (Including Goodwill) 459.8 507.6  
Total assets $ 1,498.1 1,518.0  
Document Period End Date Sep. 30, 2022    
Property, plant and equipment, net $ 301.6 283.4  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 284.9 263.9  
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 12.6 13.8  
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 4.1 5.7  
Mueller Co. [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 714.1 617.8 532.2
Intangible Assets, Net (Including Goodwill) 302.6 324.1  
Mueller Co. [Member] | Central Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 190.9 155.1 133.6
Mueller Co. [Member] | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 653.3 563.6 485.5
Mueller Co. [Member] | Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 55.0 45.7 39.4
Mueller Co. [Member] | Northeast Region [Member] [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 125.3 110.4 95.1
Mueller Co. [Member] | Southeast Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 154.3 125.7 108.3
Mueller Co. [Member] | Western Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 182.8 172.4 148.5
Mueller Co. [Member] | Other International Locations [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 5.8 8.5 7.3
Mueller Technologies [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 533.3 493.2 431.9
Intangible Assets, Net (Including Goodwill) 157.2 183.5  
Mueller Technologies [Member] | Central Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 142.9 125.6 107.3
Mueller Technologies [Member] | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 470.3 431.4 377.5
Mueller Technologies [Member] | Northeast Region [Member] [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 115.1 100.2 112.1
Mueller Technologies [Member] | Southeast Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 109.4 106.5 76.3
Mueller Technologies [Member] | Western Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 102.9 99.1 81.8
Mueller Technologies [Member] | Other International Locations [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues     33.4
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 38.6 $ 32.1  
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 $ 52.1   $ 48.1
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises      
Revenues from External Customers and Long-Lived Assets [Line Items]      
10 largest customers 20.00% 19.00% 17.00%