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Business Combinations - Schedule of Finite-Lived and Indefinite-Lived Intangible Assets (Details) - RidgeWorth
$ in Thousands
Jun. 01, 2017
USD ($)
Business Acquisition [Line Items]  
Finite-lived intangible assets acquired $ 267,000
Indefinite lived intangibles acquired 8,700
Intangible assets 275,700
Mutual fund investment contracts  
Business Acquisition [Line Items]  
Finite-lived intangible assets acquired $ 189,200
Weighted Average of Useful Life 16 years
Institutional and retail separate account investment contracts  
Business Acquisition [Line Items]  
Finite-lived intangible assets acquired $ 77,000
Weighted Average of Useful Life 10 years 4 months 24 days
Trade names  
Business Acquisition [Line Items]  
Finite-lived intangible assets acquired $ 800
Weighted Average of Useful Life 10 years