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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany $ 233.2 $ 199.7 $ 411.5 $ 366.9  
2013 0.0 0.0 0.0 1.1  
Operating income 29.9 11.3 50.6 25.5  
Depreciation and amortization 10.9 10.6 21.5 20.9  
Restructuring 1.9 2.5 5.8 3.8  
Payments to Acquire Productive Assets 8.0 9.9 14.4 14.1  
Total assets 1,234.3   1,234.3   $ 1,258.3
Intangible intangible assets, net 429.1   429.1   $ 439.3
Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 211.1 181.6 371.2 327.9  
2013 0.0 0.0 0.0 1.1  
Operating income 44.9 34.4 73.0 60.6  
Depreciation and amortization 9.4 9.1 18.5 18.1  
Restructuring 0.1 1.6 0.1 1.7  
Payments to Acquire Productive Assets 6.3 4.7 11.1 7.7  
Mueller Technologies [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 22.1 18.1 40.3 39.0  
2013 0.0 0.0 0.0 0.0  
Operating income (3.9) (13.7) (8.6) (15.9)  
Depreciation and amortization 1.5 1.4 2.9 2.6  
Restructuring 0.0 0.1 0.1 0.1  
Payments to Acquire Productive Assets 1.5 5.2 3.0 6.3  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Operating income (11.1) (9.4) (13.8) (19.2)  
Depreciation and amortization 0.0 0.1 0.1 0.2  
Restructuring 1.8 0.8 5.6 2.0  
Payments to Acquire Productive Assets $ 0.2 $ 0.0 $ 0.3 $ 0.1