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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Restructuring and other charges $ 0.6 $ 3.9 $ 3.6 $ 6.1
Operating income 36.9 42.7 100.0 103.9
Depreciation, Depletion and Amortization 14.9 15.2 44.9 44.6
Payments to Acquire Productive Assets 10.7 15.0 36.7 46.1
Net sales 333.2 310.5 916.0 815.4
Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.0 0.0 0.0 0.1
Operating income 38.1 40.2 104.8 93.0
Depreciation, Depletion and Amortization 7.6 7.9 22.5 22.8
Payments to Acquire Productive Assets 8.1 11.5 29.6 37.6
Net sales 195.9 177.0 534.7 452.9
Mueller Co. [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 53.8 44.2 145.0 117.6
Mueller Co. [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 29.4 31.7 90.5 79.0
Mueller Co. [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 44.3 37.3 122.3 90.3
Mueller Co. [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 47.4 47.9 131.3 127.6
Mueller Co. [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 174.9 161.1 489.1 414.5
Mueller Co. [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 18.8 14.9 40.7 31.7
Mueller Co. [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales 2.2 1.0 4.9 6.7
Corporate        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.6 3.7 3.4 6.5
Operating income (13.2) (18.6) (39.9) (45.5)
Depreciation, Depletion and Amortization 0.1 0.1 0.2 0.2
Payments to Acquire Productive Assets 0.0 0.0 0.0 0.1
Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.0 0.2 0.2 0.5
Operating income 12.0 21.1 35.1 56.4
Depreciation, Depletion and Amortization 7.2 7.2 22.2 21.6
Payments to Acquire Productive Assets 2.6 3.5 7.1 8.4
Net sales 137.3 133.5 381.3 362.5
Mueller Technologies [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 37.7 32.6 101.1 91.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 25.4 24.2 78.1 72.8
Mueller Technologies [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 27.8 28.8 79.6 76.1
Mueller Technologies [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 30.8 28.2 77.8 73.2
Mueller Technologies [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 121.7 113.8 336.6 313.9
Mueller Technologies [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 9.7 13.5 26.0 29.6
Mueller Technologies [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 5.9 $ 6.2 $ 18.7 $ 19.0