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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Channel
Segment
Mar. 31, 2011
Dec. 31, 2011
Segment Information      
Number of operating segments 3    
Number of principal distribution channels 3    
Statements of Income      
Revenue $ 417.7 $ 426.3  
Operating expenses:      
Depreciation and other amortization 33.8 25.9  
Other operating expenses 275.1 275.5  
Total operating expenses 308.9 301.4  
Operating income 108.8 124.9  
Non-operating (income) and expenses:      
Investment and other income (10.4) (8.7)  
Income from equity method investments, net of amortization (14.5) (10.2)  
Interest expense 16.1 27.7  
Total non-operating (income) and expenses (8.8) 8.8  
Income before income taxes 117.6 116.1  
Income taxes 24.6 26.7  
Net income 93.0 89.4  
Net income (non-controlling interests) (55.6) (50.3)  
Net income (controlling interest) 37.4 39.1  
Balance Sheet Information      
Total assets 5,209.9   5,218.9
Mutual Fund
      
Statements of Income      
Revenue 175.7 184.2  
Operating expenses:      
Depreciation and other amortization 12.0 4.1  
Other operating expenses 123.0 126.4  
Total operating expenses 135.0 130.5  
Operating income 40.7 53.7  
Non-operating (income) and expenses:      
Investment and other income (4.0) (2.3)  
Income from equity method investments, net of amortization (2.6) (1.4)  
Interest expense 0.9 10.8  
Total non-operating (income) and expenses (5.7) 7.1  
Income before income taxes 46.4 46.6  
Income taxes 10.6 11.7  
Net income 35.8 34.9  
Net income (non-controlling interests) (21.1) (18.3)  
Net income (controlling interest) 14.7 16.6  
Balance Sheet Information      
Total assets 1,965.9   1,920.6
Institutional
      
Statements of Income      
Revenue 206.8 207.0  
Operating expenses:      
Depreciation and other amortization 19.9 19.7  
Other operating expenses 129.7 127.0  
Total operating expenses 149.6 146.7  
Operating income 57.2 60.3  
Non-operating (income) and expenses:      
Investment and other income (5.1) (5.0)  
Income from equity method investments, net of amortization (10.5) (7.7)  
Interest expense 13.2 14.6  
Total non-operating (income) and expenses (2.4) 1.9  
Income before income taxes 59.6 58.4  
Income taxes 11.8 12.8  
Net income 47.8 45.6  
Net income (non-controlling interests) (28.9) (27.2)  
Net income (controlling interest) 18.9 18.4  
Balance Sheet Information      
Total assets 2,783.4   2,836.2
High Net Worth
      
Statements of Income      
Revenue 35.2 35.1  
Operating expenses:      
Depreciation and other amortization 1.9 2.1  
Other operating expenses 22.4 22.1  
Total operating expenses 24.3 24.2  
Operating income 10.9 10.9  
Non-operating (income) and expenses:      
Investment and other income (1.3) (1.4)  
Income from equity method investments, net of amortization (1.4) (1.1)  
Interest expense 2.0 2.3  
Total non-operating (income) and expenses (0.7) (0.2)  
Income before income taxes 11.6 11.1  
Income taxes 2.2 2.2  
Net income 9.4 8.9  
Net income (non-controlling interests) (5.6) (4.8)  
Net income (controlling interest) 3.8 4.1  
Balance Sheet Information      
Total assets $ 460.6   $ 462.1