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Goodwill and Acquired Client Relationships (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Changes in goodwill    
Balance at the beginning of the period $ 2,117.3 $ 2,121.9
Goodwill acquired 225.9 1.4
Foreign currency translation 12.0 (6.0)
Balance at the end of the period 2,355.2 2,117.3
Institutional
    
Changes in goodwill    
Balance at the beginning of the period 1,071.4 1,073.6
Goodwill acquired 0.3 0.1
Foreign currency translation 6.8 (2.3)
Balance at the end of the period 1,078.5 1,071.4
Mutual Fund
    
Changes in goodwill    
Balance at the beginning of the period 785.0 786.7
Goodwill acquired 151.3  
Foreign currency translation 3.2 (1.7)
Balance at the end of the period 939.5 785.0
High Net Worth
    
Changes in goodwill    
Balance at the beginning of the period 260.9 261.6
Goodwill acquired 74.3 1.3
Foreign currency translation 2.0 (2.0)
Balance at the end of the period $ 337.2 $ 260.9