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Acquisitions and Divestures (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 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	$ 9.0
Restructuring	3.2	$ 3.9
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent		Divestiture of Burlington plantOn 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 on 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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