Contingencies And Commitments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		1 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Jun. 30, 2011	Sep. 30, 2011 Boarhead Farms [Member]	Jun. 30, 2011 Boarhead Farms [Member]	Aug. 18, 2008 Boarhead Farms [Member]	Dec. 31, 2011 Duty Drawback [Member]	Jun. 30, 2008 Export Regulations Violations [Member]
Loss Contingencies [Line Items]
Increase (decrease) in environmental remediation liability	$ 0	$ 0
Environmental remediation liability	4.9	4.9	4.9
Percentage of past remediating costs including prejudgment interest						80.00%
Percentage of future remediating costs						80.00%
Contingent liability					21.8
Settlement offer							1.1
Advance payments for settlement							1.1
Settlement agreement, consideration value		$ 21.8		$ 21.8
Foreign nationals employed, exposed to protected technical data								40