Discontinued Operations, Assets Held for Sale and Divestitures (Narrative) (Details) (U.S. Pipe [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended	12 Months Ended
	Apr. 02, 2012	Mar. 31, 2013	Sep. 30, 2013
U.S. Pipe [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Sales Price, Noncash		$ 10.1
Proceeds from Divestiture of Businesses	$ 94.0		$ 4.5