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Equity Method Investments in Affiliates (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule of Equity Method Investments        
Amortization expense during the period $ 24,000,000 $ 22,100,000 $ 169,100,000 $ 66,300,000
Annual amortization expense attributable to current equity method Affiliates for next five years        
2012 37,800,000   37,800,000  
2013 44,900,000   44,900,000  
2014 23,500,000   23,500,000  
2015 14,900,000   14,900,000  
2016 12,400,000   12,400,000  
Blue Mountain Capital Management
        
Schedule of Equity Method Investments        
Value of managed assets 8,000,000,000   8,000,000,000  
Purchase price allocated to acquired client relationship 122,800,000   122,800,000  
Period of consideration paid     15 years  
Client relationship
        
Schedule of Equity Method Investments        
Weighted average life     11 years  
Amortization expense during the period 24,000,000 22,100,000 66,900,000 66,300,000
Acquired client relationships under equity method investments
        
Schedule of Equity Method Investments        
Weighted average life     8 years  
Amortization expense during the period $ 10,200,000 $ 8,200,000 $ 26,500,000 $ 24,800,000