Annual report pursuant to Section 13 and 15(d)

Variable Interest Entities (Details)

v3.3.1.900
Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Black Bison and Intermediate Holdings [Member]    
Variable Interest Entity [Line Items]    
Net investment $ 2.0 $ 15.9