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Revenue from Contracts with Customers Revenue from Contracts with Customers - By Product Type (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue from Contracts with Customers - By Product Type [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 255,993 $ 272,796 $ 519,845 $ 546,297
Federated Funds [Member]        
Revenue from Contracts with Customers - By Product Type [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 218,396   443,213  
Separate accounts [Member]        
Revenue from Contracts with Customers - By Product Type [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 37,597   $ 76,632