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Goodwill and Acquired Client Relationships (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Total intangible assets    
Total, Net book value balance at the beginning of the period $ 1,321.1 $ 1,420.6
Total, New investments 452.6  
Total, Amortization and Impairment (200.0) (97.7)
Total, Foreign currency translation 11.8 (1.8)
Total, Net book value balance at the end of the period 1,585.5 1,321.1
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  
Impairment of the indefinite-lived intangible assets   9.2
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 970.5 971.1
Accumulated amortization balance at the beginning of the period (317.0) (228.5)
Net book value balance at the beginning of the period 653.5 742.6
New investments 131.1  
Amortization and impairment (97.8) (88.5)
Foreign currency translation 1.1 (0.6)
Transfers and other 38.2  
Transfers and other 6.9  
Transfers and other 31.3  
Gross book value balance at the end of the period 1,109.6 970.5
Accumulated amortization balance at the end of the period (383.5) (317.0)
Net book value balance at the end of the period 726.1 653.5
Indefinite-lived    
Net book value balance at the beginning of the period 667.6 678.0
New investments 321.5  
Amortization and Impairment (102.2) (9.2)
Foreign currency translation 10.7 (1.2)
Transfers and other (38.2)  
Net book value balance at the end of the period 859.4 667.6
Amortization expenses    
Weighted average life 11 years  
Annual amortization expense for the next five years $ 100  
Number of annual periods of expected amortization expense 5 years