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Goodwill and Acquired Client Relationships (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Indefinite-lived        
Net book value balance at the beginning of the period     $ 667.6  
New investments     321.5  
Amortization and Impairment     (102.2)  
Foreign currency translation     9.4  
Transfer     (38.2)  
Net book value balance at the end of the period 858.1   858.1  
Total intangible assets        
Total, Net book value balance at the beginning of the period     1,321.1  
Total, New investments     452.6  
Total, Amortization and Impairment     (169.1)  
Total, Foreign currency translation     10.7  
Total, Net book value balance at the end of the period 1,615.3   1,615.3  
Amortization expenses        
Amortization expense during the period 24.0 22.1 169.1 66.3
Acquired client relationships-mutual fund management contracts
        
Indefinite-lived        
Amortization and Impairment     (102.2)  
Net book value balance at the end of the period 38.2   38.2  
Indefinite-lived intangible assets fair value assumptions, weighted average annual growth rate (as a percent)     10.00%  
Indefinite-lived intangible assets fair value assumptions, discount rate (as a percent)     15.00%  
Acquired client relationships
        
Definite-lived        
Gross book value balance at the beginning of the period     970.5  
Accumulated amortization balance at the beginning of the period     (317.0)  
Net book value balance at the beginning of the period     653.5  
New investments     131.1  
Amortization and impairment     (66.9)  
Foreign currency translation     1.3  
Transfer     38.2  
Gross book value balance at the end of the period 1,141.1   1,141.1  
Accumulated amortization balance at the end of the period (383.9)   (383.9)  
Net book value balance at the end of the period 757.2   757.2  
Amortization expenses        
Weighted average life     11 years  
Annual amortization expense for the next five years     95.0  
Number of annual periods of expected amortization expense     5 years  
Amortization expense during the period 24.0 22.1 66.9 66.3
Acquired client relationships under equity method investments
        
Amortization expenses        
Weighted average life     8 years  
Amortization expense during the period $ 10.2 $ 8.2 $ 26.5 $ 24.8