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Financial Instruments (Details Textual)
In Millions, unless otherwise specified
Jun. 30, 2014
Forward Exchange Contracts, Australian [Member]
USD ($)
Jun. 30, 2014
Forward Exchange Contracts, Australian [Member]
AUD
Jun. 30, 2014
Forward Exchange Contracts, Canadian [Member]
USD ($)
Jun. 30, 2014
Forward Exchange Contracts, Canadian [Member]
CAD
Foreign Exchange Contracts At Current Value [Line Items]        
Investment Owned, Foreign Currency Contract, Current Value $ 6.6 7.3 $ 12.6 14.0