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Segment Information - Schedule of Segment Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
channel
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting [Abstract]          
Number of operating segments | segment     3    
Number of principal distribution channels | channel     3    
Statements of Income          
Revenue $ 544.7 $ 613.1 $ 1,644.2 $ 1,894.7  
Net income (controlling interest) 109.2 107.7 321.1 362.0  
Balance Sheet Information          
Total Assets 8,323.4   8,323.4   $ 7,769.4
Operating Segments | Institutional          
Statements of Income          
Revenue 215.0 236.7 662.4 745.1  
Net income (controlling interest) 51.6 51.6 162.6 158.9  
Balance Sheet Information          
Total Assets 3,840.6   3,840.6   3,717.1
Operating Segments | Mutual Fund          
Statements of Income          
Revenue 258.6 310.1 773.8 951.3  
Net income (controlling interest) 46.3 45.2 124.4 167.8  
Balance Sheet Information          
Total Assets 3,450.2   3,450.2   3,070.5
Operating Segments | High Net Worth          
Statements of Income          
Revenue 71.1 66.3 208.0 198.3  
Net income (controlling interest) 11.3 $ 10.9 34.1 $ 35.3  
Balance Sheet Information          
Total Assets $ 1,032.6   $ 1,032.6   $ 981.8