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Commitments and Contingencies - Legal Proceedings and Other (Details)
£ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
Mar. 31, 2012
GBP (£)
Dec. 31, 2016
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2010
USD ($)
Legal Proceedings [Abstract]              
Portfolio amount of client seeking damages | £   £ 500          
Realized losses in the portfolio $ 125,000,000            
Alleged Damages - Minimum [Member]              
Legal Proceedings [Abstract]              
Damages sought 177,000,000            
Alleged Damages - Maximum [Member]              
Legal Proceedings [Abstract]              
Damages sought $ 234,000,000            
Venture Capital Funds [Member]              
Other [Abstract]              
Committed total required invest funding         $ 35,000,000    
Commitment time period duration to invest funds         6 years    
Commitment agreement fundings     $ 33,500,000        
Real Estate Fund [Member]              
Other [Abstract]              
Committed total required invest funding             $ 25,000,000
Commitment agreement fundings     20,500,000        
Real Estate Fund II [Member]              
Other [Abstract]              
Committed total required invest funding           $ 28,000,000  
Commitment agreement fundings     3,800,000        
Oil and gas fund [Member]              
Other [Abstract]              
Committed total required invest funding       $ 8,000,000      
Commitment time period duration to invest funds       3 years      
Commitment agreement fundings     $ 6,200,000