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Segment Information - Schedule of Segment Information (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
segment
channel
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 3    
Number of principal distribution channels | channel 3    
Statements of Income      
Revenue $ 545.4 $ 635.0  
Net income (controlling interest) 104.5 128.0  
Balance Sheet Information      
Total Assets 8,091.3   $ 7,769.4
Operating Segments | Institutional      
Statements of Income      
Revenue 227.3 252.9  
Net income (controlling interest) 59.9 48.7  
Balance Sheet Information      
Total Assets 3,750.8   3,717.1
Operating Segments | Mutual Fund      
Statements of Income      
Revenue 250.4 318.3  
Net income (controlling interest) 33.3 67.6  
Balance Sheet Information      
Total Assets 3,372.1   3,070.5
Operating Segments | High Net Worth      
Statements of Income      
Revenue 67.7 63.8  
Net income (controlling interest) 11.3 $ 11.7  
Balance Sheet Information      
Total Assets $ 968.4   $ 981.8