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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
VIEs that are not consolidated [Member]
Jun. 30, 2011
VIEs that are not consolidated [Member]
Jun. 30, 2012
VIEs that are not consolidated [Member]
Jun. 30, 2011
VIEs that are not consolidated [Member]
Jun. 30, 2012
International investment company [Member]
Dec. 31, 2011
International investment company [Member]
Jun. 30, 2012
Employees [Member]
Dec. 31, 2011
Employees [Member]
Related Party Transaction [Line Items]                        
Investment advisory fees         $ 0.4 $ 0.7 $ 0.8 $ 1.7        
Investment advisory fees waived 0.1 0.1 0.2 0.2                
Receivables from related party                 0.1 0.1    
Loans to employees                     $ 0.1 $ 0.1