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Goodwill and Acquired Client Relationships (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Y
Jun. 30, 2011
Jun. 30, 2012
Y
Jun. 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     2.4  
Transfer     (38.2)  
Net book value balance at the end of the period 851.1   851.1  
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     (145.1)  
Total, Foreign currency translation     2.6  
Total, Net book value balance at the end of the period 1,631.2   1,631.2  
Annual amortization expense attributable to current equity method Affiliates for next five years        
2012     32.7  
2013     32.7  
2014     11.2  
2015     2.7  
2016     0.2  
Acquired client relationships-mutual fund management contracts
        
Indefinite-lived        
Amortization and Impairment (93.5)   (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     (42.9)  
Foreign currency translation     0.2  
Transfer     38.2  
Gross book value balance at the end of the period 1,140.0   1,140.0  
Accumulated amortization balance at the end of the period (359.9)   (359.9)  
Net book value balance at the end of the period 780.1   780.1  
Amortization expenses        
Weighted average life (in years)     12  
Annual amortization expense for the next five years     95.0  
Number of annual periods of expected amortization expense (in years) 5   5  
Amortization expense during the period 21.2 22.1 42.9 44.2
Acquired client relationships under equity method investments
        
Amortization expenses        
Weighted average life (in years)     7  
Number of annual periods of expected amortization expense (in years) 5   5  
Amortization expense during the period $ 8.2 $ 8.2 $ 16.3 $ 16.6