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Related Party Transactions - Insight Portfolio Group (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Insight Portfolio Group LLC        
Related Party Transaction [Line Items]        
Related party transaction payments $ 0.1 $ 0.0 $ 0.2 $ 0.1