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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Segment
Channel
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting [Abstract]          
Number of operating segments     3    
Number of principal distribution channels     3    
Statements of Income          
Revenue $ 541.0 $ 429.6 $ 1,043.3 $ 847.2  
Operating expenses:          
Depreciation, intangible amortization and impairments 35.9 118.3 72.4 152.2  
Other operating expenses 343.7 286.3 659.0 561.2  
Total operating expenses 379.6 404.6 731.4 713.4  
Operating income 161.4 25.0 311.9 133.8  
Income from equity method investments 36.2 13.4 86.9 27.9  
Other non-operating (income) and expenses:          
Investment and other income (7.5) (3.0) (12.0) (13.4)  
Interest expense 24.3 18.5 48.5 37.1  
Imputed interest and contingent payment arrangements 8.4 (40.0) 22.6 (42.5)  
Total non-operating (income) and expenses 25.2 (24.5) 59.1 (18.8)  
Income before income taxes 172.4 62.9 339.7 180.5  
Income taxes 38.2 2.0 75.7 26.6  
Net income 134.2 60.9 264.0 153.9  
Net income (non-controlling interests) (69.5) (54.3) (136.9) (109.9)  
Net income (controlling interest) 64.7 6.6 127.1 44.0  
Balance Sheet Information          
Total assets 6,072.7   6,072.7   6,187.1
Institutional [Member]
          
Statements of Income          
Revenue 241.7 219.5 465.4 426.2  
Operating expenses:          
Depreciation, intangible amortization and impairments 19.9 18.8 39.6 38.8  
Other operating expenses 148.8 139.8 289.4 269.3  
Total operating expenses 168.7 158.6 329.0 308.1  
Operating income 73.0 60.9 136.4 118.1  
Income from equity method investments 30.0 9.3 74.5 19.8  
Other non-operating (income) and expenses:          
Investment and other income (3.4) (3.0) (5.9) (8.1)  
Interest expense 13.4 10.9 27.8 21.8  
Imputed interest and contingent payment arrangements 2.6 (17.5) 6.9 (15.2)  
Total non-operating (income) and expenses 12.6 (9.6) 28.8 (1.5)  
Income before income taxes 90.4 79.8 182.1 139.4  
Income taxes 20.7 18.0 42.8 29.8  
Net income 69.7 61.8 139.3 109.6  
Net income (non-controlling interests) (33.6) (28.4) (64.5) (57.3)  
Net income (controlling interest) 36.1 33.4 74.8 52.3  
Balance Sheet Information          
Total assets 2,919.2   2,919.2   3,176.5
Mutual Fund [Member]
          
Statements of Income          
Revenue 245.8 173.3 473.7 349.0  
Operating expenses:          
Depreciation, intangible amortization and impairments 12.8 97.7 26.4 109.7  
Other operating expenses 163.3 123.3 308.6 246.2  
Total operating expenses 176.1 221.0 335.0 355.9  
Operating income 69.7 (47.7) 138.7 (6.9)  
Income from equity method investments 3.9 2.8 7.7 5.4  
Other non-operating (income) and expenses:          
Investment and other income (3.6) (0.3) (5.4) (4.3)  
Interest expense 8.5 5.9 16.1 12.0  
Imputed interest and contingent payment arrangements 5.0 (22.7) 14.3 (27.9)  
Total non-operating (income) and expenses 9.9 (17.1) 25.0 (20.2)  
Income before income taxes 63.7 (27.8) 121.4 18.7  
Income taxes 14.0 (18.1) 25.8 (7.5)  
Net income 49.7 (9.7) 95.6 26.2  
Net income (non-controlling interests) (27.5) (21.6) (56.2) (42.7)  
Net income (controlling interest) 22.2 (31.3) 39.4 (16.5)  
Balance Sheet Information          
Total assets 2,509.4   2,509.4   2,354.8
High Net Worth [Member]
          
Statements of Income          
Revenue 53.5 36.8 104.2 72.0  
Operating expenses:          
Depreciation, intangible amortization and impairments 3.2 1.8 6.4 3.7  
Other operating expenses 31.6 23.2 61.0 45.7  
Total operating expenses 34.8 25.0 67.4 49.4  
Operating income 18.7 11.8 36.8 22.6  
Income from equity method investments 2.3 1.3 4.7 2.7  
Other non-operating (income) and expenses:          
Investment and other income (0.5) 0.3 (0.7) (1.0)  
Interest expense 2.4 1.7 4.6 3.3  
Imputed interest and contingent payment arrangements 0.8 0.2 1.4 0.6  
Total non-operating (income) and expenses 2.7 2.2 5.3 2.9  
Income before income taxes 18.3 10.9 36.2 22.4  
Income taxes 3.5 2.1 7.1 4.3  
Net income 14.8 8.8 29.1 18.1  
Net income (non-controlling interests) (8.4) (4.3) (16.2) (9.9)  
Net income (controlling interest) 6.4 4.5 12.9 8.2  
Balance Sheet Information          
Total assets $ 644.1   $ 644.1   $ 655.8