Foreign Currency Risk Management Programs (Details) In Millions	12 Months Ended
	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)	Feb. 26, 2010	Dec. 01, 2009 USD ($)	Jun. 30, 2009 USD ($)
Foreign Currency Risk Management Programs
Amount payable to U.S. subsidiary	$ 178.6
Dollars to be purchased in foreign exchange forward contract to cover intercompany payable	178.6			29.4
Exchange rate on foreign exchange forward contract in Canadian dollars			1.06	1.15
Loss on foreign exchange forward contracts	15.8
Derivative financial instruments outstanding	$ 0	$ 0			$ 0