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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Intercompany sales	$ 266.9	$ 274.3	$ 234.0	$ 192.8	$ 254.3	$ 250.2	$ 233.2	$ 178.3	$ 968.0	$ 916.0	$ 826.0
Operating income	39.0	$ 47.2	$ 22.2	$ 15.9	40.5	$ 30.6	$ 29.9	$ 20.7	124.3	121.7	102.1
Depreciation and amortization									53.0	43.7	41.9
2016									16.3	10.5	10.4
Capital expenditures									(86.6)	(55.7)	(40.6)
Property, plant and equipment, net	217.1				150.9				217.1	150.9
Total assets	1,337.3				1,291.9				$ 1,337.3	1,291.9
Document Period End Date									Sep. 30, 2019
Intangible Assets, Net (Including Goodwill)	529.4				420.2				$ 529.4	420.2
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Intercompany sales									871.0	818.8	739.9
Operating income									182.3	180.1	163.8
Depreciation and amortization									44.8	37.4	36.3
2016									1.7	0.1	2.7
Capital expenditures									(80.4)	(47.3)	(28.5)
Total assets	1,107.8				843.9				1,107.8	843.9
Intangible Assets, Net (Including Goodwill)	508.2				396.9				508.2	396.9
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Intercompany sales									97.0	97.2	86.1
Operating income									(8.7)	(24.4)	(20.3)
Depreciation and amortization									7.9	6.1	5.2
2016									0.0	0.1	0.7
Capital expenditures									(5.5)	(8.3)	(11.4)
Total assets	100.3				87.1				100.3	87.1
Intangible Assets, Net (Including Goodwill)	21.2				23.3				21.2	23.3
Corporate [Member]
Segment Reporting Information [Line Items]
Intercompany sales									0.0	0.0	0.0
Operating income									(49.3)	(34.0)	(41.4)
Depreciation and amortization									0.3	0.2	0.4
2016									14.6	10.3	7.0
Capital expenditures									(0.7)	(0.1)	$ (0.7)
Total assets	129.2				360.9				129.2	360.9
Intangible Assets, Net (Including Goodwill)	$ 0.0				$ 0.0				$ 0.0	$ 0.0

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