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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Restructuring and other charges $ 3.9 $ 8.6 $ 6.1 $ 11.9
Operating income 42.7 20.0 103.9 76.1
Depreciation, Depletion and Amortization 15.2 14.5 44.6 42.8
Payments to Acquire Productive Assets 15.0 13.9 46.1 51.2
Net sales 310.5 228.5 815.4 698.8
Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.2 0.0 (0.4) 0.4
Operating income 64.0 43.6 158.2 129.4
Depreciation, Depletion and Amortization 13.0 12.2 38.2 36.3
Payments to Acquire Productive Assets 13.8 13.4 43.3 49.1
Net sales 287.3 209.4 750.1 641.6
Mueller Co. [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 71.1 57.4 192.1 163.6
Mueller Co. [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 52.9 38.7 141.8 135.3
Mueller Co. [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 57.6 35.6 144.1 119.8
Mueller Co. [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 71.2 50.7 188.1 154.3
Mueller Co. [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 252.9 182.4 666.2 573.0
Mueller Co. [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 27.9 20.7 60.4 47.3
Mueller Co. [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales 6.5 6.3 23.5 21.3
Corporate        
Segment Reporting Information [Line Items]        
Restructuring and other charges 3.7 8.6 6.5 11.5
Operating income (18.6) (20.0) (45.5) (43.3)
Depreciation, Depletion and Amortization 0.1 0.0 0.2 0.1
Payments to Acquire Productive Assets 0.0 0.0 0.1 0.3
Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.0 0.0 0.0 0.0
Operating income (2.7) (3.6) (8.8) (10.0)
Depreciation, Depletion and Amortization 2.1 2.3 6.2 6.4
Payments to Acquire Productive Assets 1.2 0.5 2.7 1.8
Net sales 23.2 19.1 65.3 57.2
Mueller Technologies [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 5.7 5.1 17.3 13.6
Mueller Technologies [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 3.0 4.1 10.0 15.0
Mueller Technologies [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 8.5 5.2 22.3 16.6
Mueller Technologies [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 4.8 3.7 12.7 8.9
Mueller Technologies [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 22.0 18.1 62.2 54.1
Mueller Technologies [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 0.5 0.3 0.9 1.2
Mueller Technologies [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 0.7 $ 0.7 $ 2.3 $ 1.9