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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]        
Restructuring and other charges $ 0.7 $ 0.6 $ (3.0) $ 3.0
Operating income 32.9 34.2 66.9 63.1
Depreciation, Depletion and Amortization 15.5 14.8 30.3 30.0
Payments to Acquire Productive Assets 10.6 15.0 20.5 26.0
Net sales 332.9 310.5 647.7 582.8
Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.0 0.0 0.0 0.0
Operating income 15.2 35.4 39.4 66.7
Depreciation, Depletion and Amortization 7.8 7.5 15.5 14.9
Payments to Acquire Productive Assets 7.8 12.1 15.6 21.5
Net sales 157.2 183.9 322.8 338.8
Mueller Co. [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 44.0 50.7 88.0 91.2
Mueller Co. [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 30.4 31.1 61.7 61.1
Mueller Co. [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 28.6 40.7 62.0 78.0
Mueller Co. [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 36.4 45.8 85.6 83.9
Mueller Co. [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 139.4 168.3 297.3 314.2
Mueller Co. [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 15.0 14.0 19.4 21.9
Mueller Co. [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales 2.8 1.6 6.1 2.7
Corporate        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.5 0.5 (3.2) 2.9
Operating income (14.0) (12.9) (23.8) (26.8)
Depreciation, Depletion and Amortization 0.0 0.0 0.1 0.1
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 0.2 0.1 0.2 (0.1)
Operating income 31.7 11.7 51.3 23.2
Depreciation, Depletion and Amortization 7.7 7.3 14.7 15.0
Payments to Acquire Productive Assets 2.8 2.9 4.9 4.5
Net sales 175.7 126.6 324.9 244.0
Mueller Technologies [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 44.3 34.6 85.8 63.4
Mueller Technologies [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 40.6 28.4 71.8 52.7
Mueller Technologies [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 39.4 26.3 72.7 51.8
Mueller Technologies [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 32.7 22.3 61.8 47.0
Mueller Technologies [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 157.0 111.6 292.1 214.9
Mueller Technologies [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 12.6 8.7 19.9 16.3
Mueller Technologies [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 6.1 $ 6.3 $ 12.9 $ 12.8