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Acquisitions and Divestures (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of idle property	$ 0.0	$ 0.0	$ 0.0	$ 9.0
Restructuring	$ 2.5	$ 2.6	$ 12.6	8.4
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent			Divestiture of Burlington plant On December 4, 2017, we sold an idle property in Burlington, New Jersey that had previously been a plant in our former U.S. Pipe segment and recorded a gain of $9.0 million in our Corporate segment. We received $7.4 million in cash, recorded net current assets of $0.8 million and conveyed plant, property and equipment with a net carrying value of $0.4 million, and the buyer assumed related environmental liabilities with a carrying value of $1.2 million.
Repayment of Krausz debt			$ (13.2)	$ 0.0
Cash [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 7.4
Prepaid Expenses and Other Current Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets					0.8
Property, Plant and Equipment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment					0.4
Environmental Remediation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 1.2

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