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Investments - Investment Management Agreement (Details)
$ in Millions
9 Months Ended 66 Months Ended
Sep. 30, 2018
USD ($)
item
Sep. 30, 2018
USD ($)
Securities of any one issuer (excluding the U.S. Government)    
Investments    
Number of Investment Committee members required to authorize investment | item 2  
Minimum | Securities of any one issuer (excluding the U.S. Government)    
Investments    
Investments, portfolio allocations requiring additional consent 10.00%  
Maximum | Securities of any one issuer (excluding the U.S. Government)    
Investments    
Investments, target portfolio allocations percent 15.00%  
Investments, portfolio allocations requiring additional consent 15.00%  
Cash, investment grade cash equivalents or U.S. treasury securities | Minimum    
Investments    
Investments, target portfolio allocations percent 25.00%  
Common stock investments | Maximum    
Investments    
Investments, target portfolio allocations, amount $ 100.0  
Common stock investments | Maximum | Single issuer of exchange-traded common equities    
Investments    
Investments, target portfolio allocations percent 5.00%  
Common, preferred or other equity investments | Maximum    
Investments    
Investments, target portfolio allocations percent 25.00%  
FCM and FTC    
Investments    
Pre-tax income resulting from investment advisory services   $ 62.3
Investor | FCM, FTC and Mr Berkowitz    
Investments    
Common stock ownership percentage 45.15% 45.15%