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Restructuring and Severance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |
Unpaid severance and related charges | $ 5.6 |
Unpaid severance and related charges, period of payment | 3 years |
Employee Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Unpaid severance and related charges | $ 0.2 |
RidgeWorth Acquisition and Middle Office Outsourcing Restructuring Plans | Employee Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance costs | 9.6 | $ 3.9
RidgeWorth Acquisition Restructuring Plan | Facility Closing |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs | $ 1.0 | $ 0.4

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