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Goodwill and Acquired Client Relationships (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Indefinite-lived    
Net book value balance at the beginning of the period $ 667.6  
Amortization and Impairment (8.7)  
Foreign currency translation 7.0  
Net book value balance at the end of the period 665.9  
Total intangible assets    
Total,Net book value balance at the beginning of the period 1,321.1  
Total, Amortization and Impairment (30.4)  
Total, Foreign currency translation 8.1  
Total, Net book value balance at the end of the period 1,298.8  
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 (8.7)  
Net book value balance at the end of the period (131.7)  
Indefinite-lived intangible assets fair value assumptions, weighted average annual growth rate (as a percent) 3.00%  
Indefinite-lived intangible assets fair value assumptions, discount rate (as a percent) 16.00%  
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  
Amortization and impairment (21.7)  
Foreign currency translation 1.1  
Gross book value balance at the end of the period 971.6  
Accumulated amortization balance at the end of the period (338.7)  
Net book value balance at the end of the period 632.9  
Amortization expenses    
Weighted average life (in years) 10  
Annual amortization expense for the next five years 90.0  
Number of annual periods of expected amortization expense (in years) 5  
Amortization expense during the period 21.7 22.1
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  
Amortization expense during the period $ 8.2 $ 8.4