Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details)

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Variable Interest Entities (Details) (Black Bison and Intermediate Holdings [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Black Bison and Intermediate Holdings [Member]
 
Variable Interest Entity [Line Items]  
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 16.0