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Segment Information - Schedule of Segment Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Segment
Channel
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting [Abstract]          
Number of operating segments | Segment     3    
Number of principal distribution channels | Channel     3    
Statements of Income          
Revenue $ 613.1 $ 640.3 $ 1,894.7 $ 1,869.7  
Net income (controlling interest) 109.0 103.2 365.7 279.5  
Balance Sheet Information          
Total Assets 7,535.2   7,535.2   $ 7,698.1
Operating Segments | Institutional          
Statements of Income          
Revenue 236.7 256.1 745.1 766.2  
Net income (controlling interest) 52.2 46.3 160.5 131.6  
Balance Sheet Information          
Total Assets 3,480.4   3,480.4   3,739.8
Operating Segments | Mutual Fund          
Statements of Income          
Revenue 310.1 319.6 951.3 921.5  
Net income (controlling interest) 45.8 47.0 169.5 121.3  
Balance Sheet Information          
Total Assets 3,188.5   3,188.5   3,082.0
Operating Segments | High Net Worth          
Statements of Income          
Revenue 66.3 64.6 198.3 182.0  
Net income (controlling interest) 11.0 $ 9.9 35.7 $ 26.6  
Balance Sheet Information          
Total Assets $ 866.3   $ 866.3   $ 876.3