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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]      
Amount of proceeds received from a fund related to a pending sale of an investment in that fund $ 75.4   $ 13.1
Accrued performance fee-related compensation $ 1,546.5   $ 1,307.4
Percentage of estimated realizable tax benefit to be paid by corporate taxpayers on exchange transactions 85.00%    
Percentage of remaining estimated realizable tax benefit on exchange transactions 15.00%    
Foreign currency translation (gains) losses $ 3.7 $ (10.8)  
Cash [Member]      
Restricted Cash and Cash Equivalents Items [Line Items]      
Amount of proceeds received from a fund related to a pending sale of an investment in that fund $ 65.4