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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]        
Restructuring and other charges $ 3.2 $ 0.7 $ 9.8 $ (3.0)
Operating income 63.5 32.9 86.3 66.9
Depreciation, Depletion and Amortization 16.5 15.5 32.9 30.3
Payments to Acquire Productive Assets 10.1 10.6 15.8 20.5
Net sales 353.4 332.9 609.8 647.7
Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.0 0.0 0.2 0.0
Operating income 52.6 15.2 79.8 39.4
Depreciation, Depletion and Amortization 9.8 7.8 19.1 15.5
Payments to Acquire Productive Assets 6.0 7.8 9.9 15.6
Net sales 205.8 157.2 347.1 322.8
Mueller Co. [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 55.0 44.0 93.5 88.0
Mueller Co. [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 37.4 30.4 65.7 61.7
Mueller Co. [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 53.2 28.6 90.3 62.0
Mueller Co. [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 48.3 36.4 78.9 85.6
Mueller Co. [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 193.9 139.4 328.4 297.3
Mueller Co. [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 9.3 15.0 14.1 19.4
Mueller Co. [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales 2.6 2.8 4.6 6.1
Corporate        
Segment Reporting Information [Line Items]        
Restructuring and other charges 3.2 0.5 9.6 (3.2)
Operating income (18.1) (14.0) (37.6) (23.8)
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 0.0 0.2 0.0 0.2
Operating income 29.0 31.7 44.1 51.3
Depreciation, Depletion and Amortization 6.7 7.7 13.7 14.7
Payments to Acquire Productive Assets 4.1 2.8 5.9 4.9
Net sales 147.6 175.7 262.7 324.9
Mueller Technologies [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 41.4 44.3 70.6 85.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 32.7 40.6 59.5 71.8
Mueller Technologies [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 37.1 39.4 65.5 72.7
Mueller Technologies [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 23.8 32.7 43.8 61.8
Mueller Technologies [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 135.0 157.0 239.4 292.1
Mueller Technologies [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 7.4 12.6 13.1 19.9
Mueller Technologies [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 5.2 $ 6.1 $ 10.2 $ 12.9