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Goodwill and Acquired Client Relationships - Schedule of changes in goodwill (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Changes in goodwill    
Balance at the beginning of the period $ 2,355.2 $ 2,117.3
Goodwill acquired 0 225.9
Foreign currency translation (13.5) 12.0
Balance at the end of the period 2,341.7 2,355.2
Institutional [Member]
    
Changes in goodwill    
Balance at the beginning of the period 1,078.5 1,071.4
Goodwill acquired 0 0.3
Foreign currency translation (2.2) 6.8
Balance at the end of the period 1,076.3 1,078.5
Mutual Fund [Member]
    
Changes in goodwill    
Balance at the beginning of the period 939.5 785.0
Goodwill acquired 0 151.3
Foreign currency translation (11.4) 3.2
Balance at the end of the period 928.1 939.5
High Net Worth [Member]
    
Changes in goodwill    
Balance at the beginning of the period 337.2 260.9
Goodwill acquired 0 74.3
Foreign currency translation 0.1 2.0
Balance at the end of the period $ 337.3 $ 337.2