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Basis of Presentation and Principles of Consolidation (Details) - Jun. 30, 2015
$ in Millions
USD ($)
Investment
entity
Consolidated VIEs  
Total revenues and total expenses related to consolidated VIEs  
Number of variable interest entities (in investments) | entity 4
Variable interest entity, consolidated, carrying amount, assets $ 188.0
Variable interest entity, consolidated, carrying amount, liabilities 19.2
Variable interest entity unfunded commitment $ 38.8
Unconsolidated VIEs  
Total revenues and total expenses related to consolidated VIEs  
Number of variable interest entities (in investments) | Investment 26
Variable interest entity unfunded commitment $ 14.6
Carrying value of the investments $ 160.7