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Supplemental Financial Information - Supplemental Financial Position (Additional Information) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]    
Principal amount   $ 144.4
Consolidated Entities and Consolidated Funds | Consolidated Operating Entities    
Condensed Balance Sheet Statements, Captions [Line Items]    
Principal amount $ 144.4