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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Restructuring and other charges $ 3.9 $ 0.6 $ 0.9 $ 3.6
Operating income 35.6 36.9 102.5 100.0
Depreciation, Depletion and Amortization 15.8 14.9 46.1 44.9
Payments to Acquire Productive Assets 11.9 10.7 32.4 36.7
Net sales 326.6 333.2 974.3 916.0
Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.1 0.0 0.1 0.0
Operating income 12.6 38.1 52.0 104.8
Depreciation, Depletion and Amortization 8.2 7.6 23.7 22.5
Payments to Acquire Productive Assets 7.5 8.1 23.1 29.6
Net sales 150.1 195.9 472.9 534.7
Mueller Co. [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 43.0 53.8 131.0 145.0
Mueller Co. [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 31.7 29.4 93.4 90.5
Mueller Co. [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 24.8 44.3 86.8 122.3
Mueller Co. [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 37.8 47.4 123.4 131.3
Mueller Co. [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 137.3 174.9 434.6 489.1
Mueller Co. [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 9.8 18.8 29.2 40.7
Mueller Co. [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales 3.0 2.2 9.1 4.9
Corporate        
Segment Reporting Information [Line Items]        
Restructuring and other charges 2.8 0.6 (0.4) 3.4
Operating income (16.0) (13.2) (39.8) (39.9)
Depreciation, Depletion and Amortization 0.0 0.1 0.1 0.2
Payments to Acquire Productive Assets 0.0 0.0 0.0 0.0
Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 1.0 0.0 1.2 (0.2)
Operating income 39.0 12.0 90.3 35.1
Depreciation, Depletion and Amortization 7.6 7.2 22.3 22.2
Payments to Acquire Productive Assets 4.4 2.6 9.3 7.1
Net sales 176.5 137.3 501.4 381.3
Mueller Technologies [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 47.4 37.7 133.2 101.1
Mueller Technologies [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 44.3 25.4 116.1 78.1
Mueller Technologies [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 37.1 27.8 109.8 79.6
Mueller Technologies [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 31.2 30.8 93.0 77.8
Mueller Technologies [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 160.0 121.7 452.1 336.6
Mueller Technologies [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 10.0 9.7 29.9 26.0
Mueller Technologies [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 6.5 $ 5.9 $ 19.4 $ 18.7