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Segment Information - Schedule of Segment Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Segment
Channel
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting [Abstract]          
Number of operating segments | Segment     3    
Number of principal distribution channels | Channel     3    
Statements of Income          
Revenue $ 646.6 $ 636.3 $ 1,281.6 $ 1,229.4  
Net income (controlling interest) 128.7 99.1 256.7 176.2  
Balance Sheet Information          
Total Assets 7,678.8   7,678.8   $ 7,698.1
Operating Segments | Institutional          
Statements of Income          
Revenue 255.4 265.2 508.3 510.1  
Net income (controlling interest) 59.6 48.4 108.3 84.3  
Balance Sheet Information          
Total Assets 3,512.2   3,512.2   3,739.8
Operating Segments | Mutual Fund          
Statements of Income          
Revenue 323.0 310.0 641.3 601.9  
Net income (controlling interest) 56.1 41.2 123.8 75.3  
Balance Sheet Information          
Total Assets 3,246.8   3,246.8   3,082.0
Operating Segments | High Net Worth          
Statements of Income          
Revenue 68.2 61.1 132.0 117.4  
Net income (controlling interest) 13.0 $ 9.5 24.6 $ 16.6  
Balance Sheet Information          
Total Assets $ 919.8   $ 919.8   $ 876.3