Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details)

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Variable Interest Entities (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Black Bison and Intermediate Holdings [Member]      
Variable Interest Entity [Line Items]      
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 15.6 $ 15.9 $ 15.6