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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

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