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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net $ 318.8 $ 311.7  
Revenues 1,314.7 1,275.7 $ 1,247.4
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 302.8 295.6  
Israel      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 11.9 11.9  
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 4.1 4.2  
Mueller Co. [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 755.5 634.4 714.1
Mueller Co. [Member] | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 703.1 585.9 653.3
Mueller Co. [Member] | Central Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 196.8 176.0 190.9
Mueller Co. [Member] | Northeast Region [Member] [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 139.2 130.6 125.3
Mueller Co. [Member] | Southeast Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 181.6 118.4 154.3
Mueller Co. [Member] | Western Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 185.5 160.9 182.8
Mueller Co. [Member] | Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 42.2 36.2 55.0
Mueller Co. [Member] | Other international locations      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 10.2 12.3 5.8
Mueller Technologies [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 559.2 641.3 533.3
Mueller Technologies [Member] | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 505.7 576.8 470.3
Mueller Technologies [Member] | Central Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 149.4 169.2 142.9
Mueller Technologies [Member] | Northeast Region [Member] [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 120.3 151.2 115.1
Mueller Technologies [Member] | Southeast Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 132.4 137.4 109.4
Mueller Technologies [Member] | Western Region [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 103.6 119.0 102.9
Mueller Technologies [Member] | Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 33.3 38.3 39.2
Mueller Technologies [Member] | Other international locations      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 20.2 $ 26.2 $ 23.8