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Summary of Significant Accounting Policies - Principles of Consolidation (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Variable Interest Entity [Line Items]  
Consolidated VIEs, assets $ 4,600.0
Consolidated VIEs, liabilities 4,400.0
Collateralized Loan Obligations  
Variable Interest Entity [Line Items]  
Investments in CLOs $ 178.6