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Basis of Presentation Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
gmt_purchasecommitmentnumber 8,950
Long-term Debt, Gross $ 250.0 [1]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.00%
[1] (1) All operating assets are pledged as collateral on the nonrecourse debt.