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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