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Segment Information - Schedule of Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Segment Channel | Sep. 30, 2013 | Dec. 31, 2013
Segment Reporting [Abstract] |  |  |  |  |
Number of operating segments |  |  | 3 |  |
Number of principal distribution channels |  |  | 3 |  |
Statements of Income |  |  |  |  |
Revenue | $ 640.3 | $ 551.6 | $ 1,869.7 | $ 1,594.8 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 33.2 | 36.1 | 96.5 | 108.4 |
Other operating expenses | 382.9 | 346.4 | 1,156.6 | 1,005.4 |
Total operating expenses | 416.1 | 382.5 | 1,253.1 | 1,113.8 |
Operating income | 224.2 | 169.1 | 616.6 | 481.0 |
Income from equity method investments | 50.1 | 34.1 | 152.6 | 121.0 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (2.6) | (8.0) | (19.2) | (20.0) |
Interest expense | 19.0 | 19.9 | 56.7 | 68.5 |
Imputed interest expense and contingent payment arrangements | 2.8 | 3.9 | 27.6 | 26.5 |
Total non-operating (income) and expenses | 19.2 | 15.8 | 65.1 | 75.0 |
Income before income taxes | 255.1 | 187.4 | 704.1 | 527.0 |
Income taxes | 64.1 | 31.0 | 174.7 | 106.6 |
Net income | 191.0 | 156.4 | 529.4 | 420.4 |
Net income (non-controlling interests) | (86.7) | (81.2) | (247.9) | (218.1) |
Net income (controlling interest) | 104.3 | 75.2 | 281.5 | 202.3 |
Balance Sheet Information |  |  |  |  |
Total assets | 6,884.2 |  | 6,884.2 |  | 6,318.8
Institutional |  |  |  |  |
Statements of Income |  |  |  |  |
Revenue | 256.1 | 229.1 | 766.2 | 694.6 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 25.3 | 17.6 | 72.1 | 57.1 |
Other operating expenses | 151.0 | 140.3 | 470.9 | 429.8 |
Total operating expenses | 176.3 | 157.9 | 543.0 | 486.9 |
Operating income | 79.8 | 71.2 | 223.2 | 207.7 |
Income from equity method investments | 40.7 | 27.7 | 124.6 | 102.1 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (1.0) | (3.9) | (11.3) | (9.8) |
Interest expense | 9.5 | 10.6 | 29.2 | 38.4 |
Imputed interest expense and contingent payment arrangements | 0.4 | 1.2 | 10.9 | 8.2 |
Total non-operating (income) and expenses | 8.9 | 7.9 | 28.8 | 36.8 |
Income before income taxes | 111.6 | 91.0 | 319.0 | 273.0 |
Income taxes | 28.2 | 17.9 | 79.4 | 60.6 |
Net income | 83.4 | 73.1 | 239.6 | 212.4 |
Net income (non-controlling interests) | (37.1) | (33.3) | (107.8) | (97.8) |
Net income (controlling interest) | 46.3 | 39.8 | 131.8 | 114.6 |
Balance Sheet Information |  |  |  |  |
Total assets | 3,235.4 |  | 3,235.4 |  | 3,196.5
Mutual Fund |  |  |  |  |
Statements of Income |  |  |  |  |
Revenue | 319.6 | 268.0 | 921.5 | 741.5 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 3.5 | 15.6 | 12.3 | 42.0 |
Other operating expenses | 196.8 | 174.7 | 585.8 | 483.2 |
Total operating expenses | 200.3 | 190.3 | 598.1 | 525.2 |
Operating income | 119.3 | 77.7 | 323.4 | 216.3 |
Income from equity method investments | 5.6 | 4.0 | 16.5 | 11.7 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (1.5) | (3.8) | (7.0) | (9.2) |
Interest expense | 7.6 | 7.3 | 21.9 | 23.5 |
Imputed interest expense and contingent payment arrangements | 2.1 | 2.5 | 14.4 | 16.7 |
Total non-operating (income) and expenses | 8.2 | 6.0 | 29.3 | 31.0 |
Income before income taxes | 116.7 | 75.7 | 310.6 | 197.0 |
Income taxes | 30.1 | 8.8 | 79.7 | 34.6 |
Net income | 86.6 | 66.9 | 230.9 | 162.4 |
Net income (non-controlling interests) | (38.5) | (39.1) | (107.8) | (95.2) |
Net income (controlling interest) | 48.1 | 27.8 | 123.1 | 67.2 |
Balance Sheet Information |  |  |  |  |
Total assets | 2,871.4 |  | 2,871.4 |  | 2,448.4
High Net Worth |  |  |  |  |
Statements of Income |  |  |  |  |
Revenue | 64.6 | 54.5 | 182.0 | 158.7 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 4.4 | 2.9 | 12.1 | 9.3 |
Other operating expenses | 35.1 | 31.4 | 99.9 | 92.4 |
Total operating expenses | 39.5 | 34.3 | 112.0 | 101.7 |
Operating income | 25.1 | 20.2 | 70.0 | 57.0 |
Income from equity method investments | 3.8 | 2.4 | 11.5 | 7.2 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (0.1) | (0.3) | (0.9) | (1.0) |
Interest expense | 1.9 | 2.0 | 5.6 | 6.6 |
Imputed interest expense and contingent payment arrangements | 0.3 | 0.2 | 2.3 | 1.6 |
Total non-operating (income) and expenses | 2.1 | 1.9 | 7.0 | 7.2 |
Income before income taxes | 26.8 | 20.7 | 74.5 | 57.0 |
Income taxes | 5.8 | 4.3 | 15.6 | 11.4 |
Net income | 21.0 | 16.4 | 58.9 | 45.6 |
Net income (non-controlling interests) | (11.1) | (8.8) | (32.3) | (25.1) |
Net income (controlling interest) | 9.9 | 7.6 | 26.6 | 20.5 |
Balance Sheet Information |  |  |  |  |
Total assets | $ 777.4 |  | $ 777.4 |  | $ 673.9

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