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Segment Information - Schedule of segment information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statements of Income                      
Revenue $ 594.0 $ 551.6 $ 541.0 $ 502.2 $ 491.0 $ 467.3 $ 429.6 $ 417.6 $ 2,188.8 $ 1,805.5 $ 1,704.8
Operating expenses:                      
Depreciation, intangible amortization and impairments                 142.2 214.1 112.7
Other operating expenses                 1,412.5 1,191.0 1,106.0
Total operating expenses                 1,554.7 1,405.1 1,218.7
Operating income 153.1 169.1 161.4 150.5 126.9 139.7 25.0 108.8 634.1 400.4 486.1
Income from equity method investments                 307.8 129.7 72.7
Other non-operating (income) and expenses:                      
Investment and other (income) loss                 (40.8) (22.0) 5.0
Interest expense                 87.3 83.0 73.8
Imputed interest and contingent payment arrangements                 31.7 (26.1) 27.3
Total non-operating (income) and expenses                 78.2 34.9 106.1
Income before income taxes 336.6 187.4 172.4 167.3 177.1 137.5 62.9 117.7 863.7 495.2 452.7
Income taxes                 194.1 83.8 93.1
Net income                 669.6 411.4 359.6
Net income (non-controlling interests)                 (309.1) (237.4) (194.7)
Net income (controlling interest) 158.2 75.2 64.7 62.4 75.0 54.9 6.6 37.5 360.5 174.0 164.9
Balance Sheet Information                      
Total assets 6,318.8       6,187.1       6,318.8 6,187.1 5,218.9
Goodwill 2,341.7       2,355.2       2,341.7 2,355.2 2,117.3
Equity method investments in Affiliates 615.8       1,031.3       615.8 1,031.3 1,123.3
Institutional [Member]
                      
Statements of Income                      
Revenue                 948.7 861.3 841.4
Operating expenses:                      
Depreciation, intangible amortization and impairments                 82.3 75.4 76.9
Other operating expenses                 620.5 554.2 524.9
Total operating expenses                 702.8 629.6 601.8
Operating income                 245.9 231.7 239.6
Income from equity method investments                 263.9 103.9 57.2
Other non-operating (income) and expenses:                      
Investment and other (income) loss                 (23.9) (13.6) (6.9)
Interest expense                 51.0 50.7 39.7
Imputed interest and contingent payment arrangements                 8.9 (8.1) 15.1
Total non-operating (income) and expenses                 36.0 29.0 47.9
Income before income taxes                 473.8 306.6 248.9
Income taxes                 117.5 63.7 53.4
Net income                 356.3 242.9 195.5
Net income (non-controlling interests)                 (136.4) (116.9) (105.3)
Net income (controlling interest)                 219.9 126.0 90.2
Balance Sheet Information                      
Total assets 3,196.5       3,176.5       3,196.5 3,176.5 2,836.2
Goodwill 1,076.3       1,078.5       1,076.3 1,078.5 1,071.4
Equity method investments in Affiliates 490.6       879.6       490.6 879.6 942.6
Mutual Fund [Member]
                      
Statements of Income                      
Revenue                 1,023.0 774.4 723.7
Operating expenses:                      
Depreciation, intangible amortization and impairments                 47.4 128.9 28.0
Other operating expenses                 661.2 526.5 492.4
Total operating expenses                 708.6 655.4 520.4
Operating income                 314.4 119.0 203.3
Income from equity method investments                 16.6 12.7 7.9
Other non-operating (income) and expenses:                      
Investment and other (income) loss                 (15.3) (6.6) 0.6
Interest expense                 27.7 24.0 27.7
Imputed interest and contingent payment arrangements                 20.8 (19.5) 9.9
Total non-operating (income) and expenses                 33.2 (2.1) 38.2
Income before income taxes                 297.8 133.8 173.0
Income taxes                 56.3 10.7 34.4
Net income                 241.5 123.1 138.6
Net income (non-controlling interests)                 (138.1) (95.8) (73.1)
Net income (controlling interest)                 103.4 27.3 65.5
Balance Sheet Information                      
Total assets 2,448.4       2,354.8       2,448.4 2,354.8 1,920.6
Goodwill 928.1       939.5       928.1 939.5 785.0
Equity method investments in Affiliates 75.6       81.2       75.6 81.2 77.7
High Net Worth [Member]
                      
Statements of Income                      
Revenue                 217.1 169.8 139.7
Operating expenses:                      
Depreciation, intangible amortization and impairments                 12.5 9.8 7.8
Other operating expenses                 130.8 110.3 88.7
Total operating expenses                 143.3 120.1 96.5
Operating income                 73.8 49.7 43.2
Income from equity method investments                 27.3 13.1 7.6
Other non-operating (income) and expenses:                      
Investment and other (income) loss                 (1.6) (1.8) 11.3
Interest expense                 8.6 8.3 6.4
Imputed interest and contingent payment arrangements                 2.0 1.5 2.3
Total non-operating (income) and expenses                 9.0 8.0 20.0
Income before income taxes                 92.1 54.8 30.8
Income taxes                 20.3 9.4 5.3
Net income                 71.8 45.4 25.5
Net income (non-controlling interests)                 (34.6) (24.7) (16.3)
Net income (controlling interest)                 37.2 20.7 9.2
Balance Sheet Information                      
Total assets 673.9       655.8       673.9 655.8 462.1
Goodwill 337.3       337.2       337.3 337.2 260.9
Equity method investments in Affiliates $ 49.6       $ 70.5       $ 49.6 $ 70.5 $ 103.0