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Acquisition of Sterne Agee Group, Inc (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 05, 2015
Sep. 30, 2015
Sterne, Agee & Leach, Inc. [Member]    
Business Acquisition [Line Items]    
Proceeds from Legal Settlements   $ 35.6
Sterne Agee Group, Inc. [Member]    
Business Acquisition [Line Items]    
Goodwill and intangible assets $ 90.1  
Fair value of awards issued as retention 23.8  
Employee retention compensation paid in notes $ 33.8  
Sterne Agee Group, Inc. [Member] | Minimum [Member]    
Business Acquisition [Line Items]    
Individual compensation and benefits useful period 5 years  
Sterne Agee Group, Inc. [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Individual compensation and benefits useful period 10 years