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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]        
Restructuring and other charges $ (0.6) $ (0.8) $ (3.0) $ (2.2)
Operating income 34.2 33.4 63.1 61.2
Depreciation, Depletion and Amortization 14.8 14.7 30.0 29.4
Payments to Acquire Productive Assets 15.0 15.5 26.0 31.1
Net sales 310.5 267.5 582.8 504.9
Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges 0.0 0.0 0.0 (0.1)
Operating income 35.4 29.7 66.7 52.8
Depreciation, Depletion and Amortization 7.5 7.5 14.9 14.9
Payments to Acquire Productive Assets 12.1 13.8 21.5 26.1
Net sales 183.9 147.1 338.8 275.9
Mueller Co. [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 50.7 38.4 91.2 73.4
Mueller Co. [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 31.1 22.4 61.1 47.3
Mueller Co. [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 40.7 29.9 78.0 53.0
Mueller Co. [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 45.8 43.4 83.9 79.7
Mueller Co. [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 168.3 134.1 314.2 253.4
Mueller Co. [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 14.0 11.1 21.9 16.8
Mueller Co. [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales 1.6 1.9 2.7 5.7
Corporate        
Segment Reporting Information [Line Items]        
Restructuring and other charges (0.5) (1.5) (2.9) (2.8)
Operating income (12.9) (14.6) (26.8) (26.9)
Depreciation, Depletion and Amortization 0.0 0.0 0.1 0.1
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 (0.1) (0.7) (0.1) (0.7)
Operating income 11.7 18.3 23.2 35.3
Depreciation, Depletion and Amortization 7.3 7.2 15.0 14.4
Payments to Acquire Productive Assets 2.9 1.7 4.5 4.9
Net sales 126.6 120.4 244.0 229.0
Mueller Technologies [Member] | Central Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 34.6 32.3 63.4 59.2
Mueller Technologies [Member] | Northeast Region [Member] [Member]        
Segment Reporting Information [Line Items]        
Net sales 28.4 24.2 52.7 48.6
Mueller Technologies [Member] | Southeast Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 26.3 24.7 51.8 47.5
Mueller Technologies [Member] | Western Region [Member]        
Segment Reporting Information [Line Items]        
Net sales 22.3 23.1 47.0 45.2
Mueller Technologies [Member] | UNITED STATES        
Segment Reporting Information [Line Items]        
Net sales 111.6 104.3 214.9 200.5
Mueller Technologies [Member] | CANADA        
Segment Reporting Information [Line Items]        
Net sales 8.7 9.4 16.3 16.1
Mueller Technologies [Member] | Other International Locations [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 6.3 $ 6.7 $ 12.8 $ 12.4