Contingencies and Commitments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2011 Boarhead Farms	Jun. 30, 2011 Boarhead Farms	Aug. 18, 2008 Boarhead Farms
Loss contingencies
Increase made by the company in the liabilities of environmental remediation costs	$ 0.7	$ 0.3	$ 0.7
Environmental remediation liability	15.5	14.8
Percentage of past remediating costs including prejudgment interest						80.00%
Percentage of future remediating costs						80.00%
Contingent liability					21.8
Payment for settlement			$ 21.8	$ 21.8