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Business Combinations - Additional Information (Detail) - USD ($) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 01, 2017 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |
Purchase price, cash |  |  | $ 471.4
RidgeWorth |  |  |
Business Acquisition [Line Items] |  |  |
Assets under management |  | $ 40,100.0 |
Long term assets under management |  | 35,700.0 |
Liquidity strategy assets under management |  | 4,400.0 |
Purchase price |  | 547.1 |
Consolidated entity excluding consolidated investment products | RidgeWorth |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  | 485.2 |
CLOs | RidgeWorth |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  | $ 61.9 |
Forecast | Sustainable Growth Advisers, LP |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price, cash | $ 129.5 |  |

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