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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Segment
Channel
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting [Abstract]          
Number of operating segments     3    
Number of principal distribution channels     3    
Statements of Income          
Revenue $ 551.6 $ 467.3 $ 1,594.8 $ 1,314.5  
Operating expenses:          
Depreciation, intangible amortization and impairments 36.1 27.5 108.4 179.7  
Other operating expenses 346.4 300.1 1,005.4 861.3  
Total operating expenses 382.5 327.6 1,113.8 1,041.0  
Operating income 169.1 139.7 481.0 273.5  
Income from equity method investments 34.1 19.4 121.0 47.3  
Other non-operating (income) and expenses:          
Investment and other income (8.0) (6.9) (20.0) (20.3)  
Interest expense 19.9 21.8 68.5 58.8  
Imputed interest and contingent payment arrangements 3.9 6.7 26.5 (35.7)  
Total non-operating (income) and expenses 15.8 21.6 75.0 2.8  
Income before income taxes 187.4 137.5 527.0 318.0  
Income taxes 31.0 19.4 106.6 46.0  
Net income 156.4 118.1 420.4 272.0  
Net income (non-controlling interests) (81.2) (63.2) (218.1) (173.1)  
Net income (controlling interest) 75.2 54.9 202.3 98.9  
Balance Sheet Information          
Total assets 6,261.1   6,261.1   6,187.1
Institutional [Member]
          
Statements of Income          
Revenue 229.1 210.7 694.6 636.8  
Operating expenses:          
Depreciation, intangible amortization and impairments 17.6 19.0 57.1 57.8  
Other operating expenses 140.3 131.5 429.8 400.9  
Total operating expenses 157.9 150.5 486.9 458.7  
Operating income 71.2 60.2 207.7 178.1  
Income from equity method investments 27.7 14.8 102.1 34.6  
Other non-operating (income) and expenses:          
Investment and other income (3.9) (2.8) (9.8) (10.9)  
Interest expense 10.6 12.0 38.4 33.7  
Imputed interest and contingent payment arrangements 1.2 3.0 8.2 (12.1)  
Total non-operating (income) and expenses 7.9 12.2 36.8 10.7  
Income before income taxes 91.0 62.8 273.0 202.0  
Income taxes 17.9 9.4 60.6 39.2  
Net income 73.1 53.4 212.4 162.8  
Net income (non-controlling interests) (33.3) (28.5) (97.8) (85.8)  
Net income (controlling interest) 39.8 24.9 114.6 77.0  
Balance Sheet Information          
Total assets 2,964.6   2,964.6   3,176.5
Mutual Fund [Member]
          
Statements of Income          
Revenue 268.0 208.3 741.5 557.4  
Operating expenses:          
Depreciation, intangible amortization and impairments 15.6 5.4 42.0 115.1  
Other operating expenses 174.7 139.1 483.2 385.2  
Total operating expenses 190.3 144.5 525.2 500.3  
Operating income 77.7 63.8 216.3 57.1  
Income from equity method investments 4.0 3.2 11.7 8.5  
Other non-operating (income) and expenses:          
Investment and other income (3.8) (3.2) (9.2) (7.5)  
Interest expense 7.3 7.5 23.5 19.5  
Imputed interest and contingent payment arrangements 2.5 3.2 16.7 (24.7)  
Total non-operating (income) and expenses 6.0 7.5 31.0 (12.7)  
Income before income taxes 75.7 59.5 197.0 78.3  
Income taxes 8.8 7.5 34.6 0  
Net income 66.9 52.0 162.4 78.3  
Net income (non-controlling interests) (39.1) (27.3) (95.2) (70.0)  
Net income (controlling interest) 27.8 24.7 67.2 8.3  
Balance Sheet Information          
Total assets 2,633.5   2,633.5   2,354.8
High Net Worth [Member]
          
Statements of Income          
Revenue 54.5 48.3 158.7 120.3  
Operating expenses:          
Depreciation, intangible amortization and impairments 2.9 3.1 9.3 6.8  
Other operating expenses 31.4 29.5 92.4 75.2  
Total operating expenses 34.3 32.6 101.7 82.0  
Operating income 20.2 15.7 57.0 38.3  
Income from equity method investments 2.4 1.4 7.2 4.2  
Other non-operating (income) and expenses:          
Investment and other income (0.3) (0.9) (1.0) (1.9)  
Interest expense 2.0 2.3 6.6 5.6  
Imputed interest and contingent payment arrangements 0.2 0.5 1.6 1.1  
Total non-operating (income) and expenses 1.9 1.9 7.2 4.8  
Income before income taxes 20.7 15.2 57.0 37.7  
Income taxes 4.3 2.5 11.4 6.8  
Net income 16.4 12.7 45.6 30.9  
Net income (non-controlling interests) (8.8) (7.4) (25.1) (17.3)  
Net income (controlling interest) 7.6 5.3 20.5 13.6  
Balance Sheet Information          
Total assets $ 663.0   $ 663.0   $ 655.8