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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (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
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 266.9	$ 274.3	$ 234.0	$ 192.8	$ 254.3	$ 250.2	$ 233.2	$ 178.3	$ 968.0	$ 916.0	$ 826.0
Intangible Assets, Net (Including Goodwill)	529.4				420.2				529.4	420.2
Total assets	1,337.3				1,291.9				$ 1,337.3	1,291.9
Document Period End Date									Sep. 30, 2019
Property, plant and equipment, net	217.1				150.9				$ 217.1	150.9
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	201.3				144.8				201.3	144.8
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	3.6				3.4				3.6	3.4
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	12.2				2.7				12.2	2.7
Mueller Co. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									871.0	818.8	739.9
Intangible Assets, Net (Including Goodwill)	508.2				396.9				508.2	396.9
Total assets	1,107.8				843.9				1,107.8	843.9
Mueller Co. [Member] | Central Region [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									214.2	204.2
Mueller Co. [Member] | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									772.8	728.5
Mueller Co. [Member] | Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									69.0	76.2
Mueller Co. [Member] | Northeast Region [Member] [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									183.1	173.2
Mueller Co. [Member] | Southeast Region [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									162.7	146.1
Mueller Co. [Member] | Western Region [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									212.8	205.0
Mueller Co. [Member] | Other International Locations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									29.2	14.1
Mueller Technologies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									97.0	97.2	86.1
Intangible Assets, Net (Including Goodwill)	21.2				23.3				21.2	23.3
Total assets	100.3				87.1				100.3	87.1
Mueller Technologies [Member] | Central Region [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									27.8	17.8
Mueller Technologies [Member] | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									92.0	92.9
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									20.4	19.9
Mueller Technologies [Member] | Southeast Region [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									33.5	43.8
Mueller Technologies [Member] | Western Region [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									10.3	11.4
Mueller Technologies [Member] | Other International Locations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									5.0	4.3
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Ferguson Enterprises
Revenues from External Customers and Long-Lived Assets [Line Items]
Accounts and Other Receivables, Net, Current	25.8				$ 29.7				25.8	$ 29.7
Customer Concentration Risk [Member] | Accounts Receivable [Member] | HDS IP Holdings, LLC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Accounts and Other Receivables, Net, Current	$ 31.9								$ 31.9		$ 31.7
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Major Customers, Group One
Revenues from External Customers and Long-Lived Assets [Line Items]
10 largest customers									53.00%	54.00%	53.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Major Customers, Group Two
Revenues from External Customers and Long-Lived Assets [Line Items]
10 largest customers									34.00%	34.00%	34.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises
Revenues from External Customers and Long-Lived Assets [Line Items]
10 largest customers									18.00%	19.00%	18.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises | Mueller Co. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
10 largest customers									17.00%	18.00%	17.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | Ferguson Enterprises | Mueller Technologies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
10 largest customers									30.00%	28.00%	24.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | HDS IP Holdings, LLC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
10 largest customers									16.00%	15.00%	16.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Gross [Member] | HDS IP Holdings, LLC [Member] | Mueller Co. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
10 largest customers									18.00%	17.00%	17.00%

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