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DERIVATIVE FINANCIAL INSTRUMENTS: (Details 3) (Freestanding derivative contracts, Forward foreign currency contracts, Less than, USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Freestanding derivative contracts | Forward foreign currency contracts | Less than
   
Derivative gains and losses    
Loss on settlement of interest rate derivatives $ 0.1 $ (0.4)