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Intangible Assets - Schedule of Changes in Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Goodwill [Roll Forward]  
Beginning balance (in dollars) $ 2,341.7
Goodwill acquired 150.0
Foreign currency translation (0.7)
Ending balance (in dollars) 2,491.0
Institutional
  
Goodwill [Roll Forward]  
Beginning balance (in dollars) 1,076.3
Goodwill acquired 49.6
Foreign currency translation (0.9)
Ending balance (in dollars) 1,125.0
Mutual Fund
  
Goodwill [Roll Forward]  
Beginning balance (in dollars) 928.1
Goodwill acquired 60.9
Foreign currency translation 0.6
Ending balance (in dollars) 989.6
High Net Worth
  
Goodwill [Roll Forward]  
Beginning balance (in dollars) 337.3
Goodwill acquired 39.5
Foreign currency translation (0.4)
Ending balance (in dollars) $ 376.4