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Segment Information - Schedule of Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Segment Channel | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting [Abstract] |  |  |  |  |
Number of operating segments |  |  | 3 |  |
Number of principal distribution channels |  |  | 3 |  |
Statements of Income |  |  |  |  |
Revenue | $ 636.3 | $ 541.0 | $ 1,229.4 | $ 1,043.3 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 32.2 | 35.9 | 63.4 | 72.4 |
Other operating expenses | 405.7 | 343.7 | 773.6 | 659.0 |
Total operating expenses | 437.9 | 379.6 | 837.0 | 731.4 |
Operating income | 198.4 | 161.4 | 392.4 | 311.9 |
Income from equity method investments | 56.3 | 36.2 | 102.5 | 86.9 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (8.4) | (7.5) | (16.6) | (12.0) |
Interest expense | 20.0 | 24.3 | 37.7 | 48.5 |
Imputed interest expense and contingent payment arrangements | 2.4 | 8.4 | 24.8 | 22.6 |
Total non-operating (income) and expenses | (14.0) | (25.2) | (45.9) | (59.1) |
Income before income taxes | 240.7 | 172.4 | 449.0 | 339.7 |
Income taxes | 61.7 | 38.2 | 110.6 | 75.7 |
Net income | 179.0 | 134.2 | 338.4 | 264.0 |
Net income (non-controlling interests) | (78.9) | (69.5) | (161.2) | (136.9) |
Net income (controlling interest) | 100.1 | 64.7 | 177.2 | 127.1 |
Balance Sheet Information |  |  |  |  |
Total assets | 6,730.2 |  | 6,730.2 |  | 6,318.8
Institutional |  |  |  |  |
Statements of Income |  |  |  |  |
Revenue | 265.2 | 241.7 | 510.1 | 465.4 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 23.5 | 19.9 | 46.9 | 39.6 |
Other operating expenses | 165.0 | 148.8 | 319.9 | 289.4 |
Total operating expenses | 188.5 | 168.7 | 366.8 | 329.0 |
Operating income | 76.7 | 73.0 | 143.3 | 136.4 |
Income from equity method investments | 46.9 | 30.0 | 83.9 | 74.5 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (4.8) | (3.4) | (10.3) | (5.9) |
Interest expense | 10.7 | 13.4 | 19.7 | 27.8 |
Imputed interest expense and contingent payment arrangements | 0.2 | 2.6 | 10.5 | 6.9 |
Total non-operating (income) and expenses | (6.1) | (12.6) | (19.9) | (28.8) |
Income before income taxes | 117.5 | 90.4 | 207.3 | 182.1 |
Income taxes | 29.4 | 20.7 | 51.3 | 42.8 |
Net income | 88.1 | 69.7 | 156.0 | 139.3 |
Net income (non-controlling interests) | (38.6) | (33.6) | (70.7) | (64.5) |
Net income (controlling interest) | 49.5 | 36.1 | 85.3 | 74.8 |
Balance Sheet Information |  |  |  |  |
Total assets | 3,195.8 |  | 3,195.8 |  | 3,196.5
Mutual Fund |  |  |  |  |
Statements of Income |  |  |  |  |
Revenue | 310.0 | 245.8 | 601.9 | 473.7 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 4.8 | 12.8 | 8.8 | 26.4 |
Other operating expenses | 207.5 | 163.3 | 388.9 | 308.6 |
Total operating expenses | 212.3 | 176.1 | 397.7 | 335.0 |
Operating income | 97.7 | 69.7 | 204.2 | 138.7 |
Income from equity method investments | 5.3 | 3.9 | 10.9 | 7.7 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (3.1) | (3.6) | (5.5) | (5.4) |
Interest expense | 7.4 | 8.5 | 14.3 | 16.1 |
Imputed interest expense and contingent payment arrangements | 2.0 | 5.0 | 12.2 | 14.3 |
Total non-operating (income) and expenses | (6.3) | (9.9) | (21.0) | (25.0) |
Income before income taxes | 96.7 | 63.7 | 194.1 | 121.4 |
Income taxes | 26.8 | 14.0 | 49.5 | 25.8 |
Net income | 69.9 | 49.7 | 144.6 | 95.6 |
Net income (non-controlling interests) | (28.8) | (27.5) | (69.3) | (56.2) |
Net income (controlling interest) | 41.1 | 22.2 | 75.3 | 39.4 |
Balance Sheet Information |  |  |  |  |
Total assets | 2,785.5 |  | 2,785.5 |  | 2,448.4
High Net Worth |  |  |  |  |
Statements of Income |  |  |  |  |
Revenue | 61.1 | 53.5 | 117.4 | 104.2 |
Operating expenses: |  |  |  |  |
Depreciation, intangible amortization and impairments | 3.9 | 3.2 | 7.7 | 6.4 |
Other operating expenses | 33.2 | 31.6 | 64.8 | 61.0 |
Total operating expenses | 37.1 | 34.8 | 72.5 | 67.4 |
Operating income | 24.0 | 18.7 | 44.9 | 36.8 |
Income from equity method investments | 4.1 | 2.3 | 7.7 | 4.7 |
Other non-operating (income) and expenses: |  |  |  |  |
Investment and other income | (0.5) | (0.5) | (0.8) | (0.7) |
Interest expense | 1.9 | 2.4 | 3.7 | 4.6 |
Imputed interest expense and contingent payment arrangements | 0.2 | 0.8 | 2.1 | 1.4 |
Total non-operating (income) and expenses | (1.6) | (2.7) | (5.0) | (5.3) |
Income before income taxes | 26.5 | 18.3 | 47.6 | 36.2 |
Income taxes | 5.5 | 3.5 | 9.8 | 7.1 |
Net income | 21.0 | 14.8 | 37.8 | 29.1 |
Net income (non-controlling interests) | (11.5) | (8.4) | (21.2) | (16.2) |
Net income (controlling interest) | 9.5 | 6.4 | 16.6 | 12.9 |
Balance Sheet Information |  |  |  |  |
Total assets | $ 748.9 |  | $ 748.9 |  | $ 673.9

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