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Summary of Significant Accounting Polices and Adoption of New Accounting Pronoucements (Details)
$ in Millions
6 Months Ended 102 Months Ended
Jun. 30, 2016
USD ($)
entity
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Accounting Policies [Abstract]        
Accrued performance fees $ 9.1 $ 9.1   $ 4.0
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Variable Interest Entity, Number of Entities | entity 8      
Negative fund Performance that would cause reversal of performance fees   25.5    
Noncontrolling interests $ 1,492.2 $ 1,492.2 $ 1,731.3  
Percentage of investments in foreign platforms 37.00% 37.00%    
Minimum [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Percentage of investments hedged 50.00% 50.00%    
Maximum [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Percentage of investments hedged 100.00% 100.00%    
KWE [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Noncontrolling interests $ 1,300.0 $ 1,300.0