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Commitments and Contingencies - Legal Proceedings and Other (Details)
£ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2012
GBP (£)
Dec. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Legal Proceedings [Abstract]              
Portfolio amount of client seeking damages | £     £ 500        
Realized losses in the portfolio   $ 125,000,000          
Other [Abstract]              
Term of guarantee 60 days            
Maximum exposure in relation to bank guarantee $ 50,000,000.0     $ 50,000,000.0      
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       32,100,000      
Real Estate Fund [Member]              
Other [Abstract]              
Committed total required invest funding             $ 25,000,000
Commitment agreement fundings       19,600,000      
Real Estate Fund II [Member]              
Other [Abstract]              
Committed total required invest funding $ 28,000,000     28,000,000      
Commitment agreement fundings       1,400,000      
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       $ 6,100,000