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Business Combinations - Additional Information (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2018 | Jun. 01, 2017 | Aug. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, cash |  |  |  | $ 129,500 | $ 471,400 |
Goodwill |  |  |  | $ 290,366 |  | $ 170,153
Sustainable Growth Advisers, LP |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired | 70.00% |  |  |  |  |
Purchase price | $ 129,500 |  |  |  |  |
Purchase price, cash | 110,500 |  | $ 19,000 |  |  |
Goodwill | 120,213 |  |  |  |  |
Intangible assets | 62,000 |  |  |  |  |
Expected tax deductible amount of goodwill and other intangible assets | $ 127,500 |  |  |  |  |
RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 547,100 |  |  |  |
Goodwill |  | 163,365 |  |  |  |
Intangible assets |  | 275,700 |  |  |  |
Assets under management |  | 40,100,000 |  |  |  |
Long term assets under management |  | 35,700,000 |  |  |  |
Liquidity strategy assets under management |  | 4,400,000 |  |  |  |
Consolidated entity excluding consolidated investment products | RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | 485,200 |  |  |  |
CLOs | RidgeWorth |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 61,900 |  |  |  |
Sustainable Growth Advisers, LP | SGIA, LLC | Sustainable Growth Advisers, LP |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of membership interests | 100.00% |  |  |  |  |

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