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Organization (Details) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2014	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017
Segment Reporting Information [Line Items]
Beginning balance				$ 0.9	$ 3.3
Restructuring		$ 2.5	$ 2.6	12.6	8.4
Payments				4.6	$ 6.3
Number of Reportable Segments					2,000,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	49.00%
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost		$ (0.1)	$ 0.2	$ 0.8	$ 0.7
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	24.50%	21.00%	24.50%	35.00%
Other Nonrecurring Expense		$ 0.7
Other Nonrecurring (Income) Expense				$ 4.9
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Restructuring		$ 0.0	$ 0.0	$ 1.1	$ 0.1

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