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Intangible Assets - Schedule of Changes in Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Goodwill [Roll Forward]  
Beginning balance (in dollars) $ 2,341.7
Goodwill acquired 150.2
Foreign currency translation (17.3)
Ending balance (in dollars) 2,474.6
Institutional
  
Goodwill [Roll Forward]  
Beginning balance (in dollars) 1,076.3
Goodwill acquired 49.7
Foreign currency translation (8.8)
Ending balance (in dollars) 1,117.2
Mutual Fund
  
Goodwill [Roll Forward]  
Beginning balance (in dollars) 928.1
Goodwill acquired 61.0
Foreign currency translation (3.2)
Ending balance (in dollars) 985.9
High Net Worth
  
Goodwill [Roll Forward]  
Beginning balance (in dollars) 337.3
Goodwill acquired 39.5
Foreign currency translation (5.3)
Ending balance (in dollars) $ 371.5