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Restructuring and Severance - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Jun. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Unpaid severance and related charges |  |  | $ 6.8
Unpaid severance and related charges, period of payment |  | 3 years |
Severance costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Unpaid severance and related charges | $ 0.3 | $ 0.3 |
RidgeWorth acquisition and middle office outsourcing restructuring plans | Severance costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 0.5 | 9.4 |
RidgeWorth acquisition restructuring plan | Facility Closing |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 1.0 | $ 1.0 |

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