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Goodwill and Acquired Client Relationships (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Changes in goodwill  
Balance at the beginning of the period $ 2,117.3
Foreign currency translation 8.5
Balance at the end of the period 2,125.8
Mutual Fund
  
Changes in goodwill  
Balance at the beginning of the period 785.0
Foreign currency translation 1.6
Balance at the end of the period 786.6
Institutional
  
Changes in goodwill  
Balance at the beginning of the period 1,071.4
Foreign currency translation 4.3
Balance at the end of the period 1,075.7
High Net Worth
  
Changes in goodwill  
Balance at the beginning of the period 260.9
Foreign currency translation 2.6
Balance at the end of the period $ 263.5