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Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill    
Goodwill impairment $ 0 $ 0
Changes in goodwill    
Balance at the beginning of the period 2,668,400,000 2,652,800,000
Goodwill acquired 0 64,300,000
Foreign currency translation (40,300,000) (48,700,000)
Balance at the end of the period 2,628,100,000 2,668,400,000
Institutional    
Changes in goodwill    
Balance at the beginning of the period 1,141,300,000 1,159,100,000
Goodwill acquired 0 9,200,000
Foreign currency translation (5,100,000) (27,000,000)
Balance at the end of the period 1,136,200,000 1,141,300,000
Mutual Fund    
Changes in goodwill    
Balance at the beginning of the period 1,119,500,000 1,125,300,000
Goodwill acquired 0 0
Foreign currency translation (37,000,000) (5,800,000)
Balance at the end of the period 1,082,500,000 1,119,500,000
High Net Worth    
Changes in goodwill    
Balance at the beginning of the period 407,600,000 368,400,000
Goodwill acquired 0 55,100,000
Foreign currency translation 1,800,000 (15,900,000)
Balance at the end of the period $ 409,400,000 $ 407,600,000